ПАРОКОМПРЕССИОННАЯ УСТАНОВКА

Изобретение относится к парокомпрессионным установкам, работающим по разомкнутому циклу, принцип действия которых основан на создании в камере разрежения, сопровождающегося кипением и испарением жидкого рабочего тела, последующего сжатия полученного пара и его конденсации в камере конденсации (обратный цикл Карно). Парокомпрессионная установка содержит испаритель с патрубками подвода и отвода рабочего тела, конденсатор с патрубком отвода конденсата, снабженный электродвигателем и герметичным корпусом компрессор. Вход компрессора сообщен с полостью испарителя, а выход сообщен с полостью конденсатора через кольцевой диффузор с наружной обечайкой. Полости испарителя и конденсатора гидравлически изолированы друг от друга. Электродвигатель размещен в герметичном корпусе и снабжен каналом жидкостного охлаждения герметичного корпуса. Кольцевой диффузор дополнительно оснащен внутренней обечайкой, образующей полость, в которой размещен электродвигатель. Вал ротора электродвигателя консольно закреплен ...

ТУРБОАГРЕГАТ КОМПРЕССОРНО-НАСОСНЫЙ

Изобретение относится и перекачке паров хладагента и может быть использовано в холодильной технике, в частности в системах кондиционирования воздуха для охлаждения электронной аппаратуры, а также в комбинированных абсорбционно-компрессорных установках. Турбоагрегат содержит герметичный корпус, электродвигатель, снабженный рубашкой охлаждения, с валом, подшипники скольжения, две пары рабочих компрессорных колес. В агрегат дополнительно включена пара рабочих колес, одно из которых является компрессорным, а другое - насосным, а в системе смазки использован хладагент. Комплексное агрегатирование компрессорной и насосной частей позволяет перевести агрегат на один тип рабочего тела, полностью исключить присутствие смазочного масла и воды. 2 ил.

УСТРОЙСТВО ДЛЯ ОБЕСПЕЧЕНИЯ ОБЪЕКТА ТЕПЛОМ И ХОЛОДОМ (ВАРИАНТЫ)

... 1. Устройство для обеспечения объекта теплом и холодом, содержащее турбодетандер, линию подачи воздуха, на которой последовательно установлены заборное устройство, фильтр и многоступенчатый компрессор, соединенный с турбодетандером линией высокого давления, которая включает водяной теплообменник и первый влагоотделитель, два рекуперативных теплообменника и второй влагоотделитель, и линию низкого давления, соединяющую турбодетандер с объектом, отличающееся тем, что оно снабжено одноступенчатым центробежным компрессором, дополнительными влагоотделителем и теплообменником, при этом одноступенчатый центробежный компрессор установлен на одном валу с турбодетандером и размещен между многоступенчатым компрессором и водяным теплообменником, дополнительный влагоотделитель установлен после первого рекуперативного теплообменника, а дополнительный теплообменник установлен на линии низкого давления таким образом, что одна его полость подсоединена ко входу второго рекуперативного теплообменника, а другая ...

VERFAHREN UND VORRICHTUNG ZUR ANWENDUNG EINES DOPPELKREISELVERDICHTERS IN EINER KÜHLEREINHEIT

Refrigeration system utilizing an expansion jet compressor

A closed loop vapor cycle refrigeration system having an enthalpy-expander-jet-compressor (100) is disclosed. A portion of the liquid refrigerant in the system is expanded into gas in the enthalpy expander (114). The expanded gas (122) is used to operate a compressor (144) coupled to the evaporator outlet (65). The compressor (144) compresses the low pressure gas from the evaporator (50) and discharges the compressed gas either to a primary compressor (14) or to the condenser (28). A novel enthalpy-expander-jet-compressor (100) is also disclosed for use in the refrigeration system. ...

Purge mechanism for refrigeration system

... 950,750. Refrigerating. CARRIER CORPORATION. Dec. 30, 1960 [Jan. 4, 1960], No. 44861/60. Heading F4H. A purging device for a refrigerating system comprises a chamber for receiving non-condensible gases and entrained refrigerant and water vapours, means for condensing said vapours, means for expelling the non-condensibles from the chamber and control means operable in conjunction with conduit means leading to the expulsion means either automatically to expel non-condensibles from the chamber or to isolate the chamber from the system and elevate its pressure to drain condensed water therefrom. As shown the device is used with a compression system of the type described in Specification 800,088 and comprises a chamber 24 having a central space which is traversed by tubes 29 which extend between headers 26 and 28 and are supplied with liquid refrigerant withdrawn from the evaporator 18 through line 30. Non-condensibles with entrained refrigerant and water vapour flow from the top of condenser ...

Rolling element bearings for an oil-free liquid chiller

A refrigeration chiller employs a centrifugal compressor the impellers of which are mounted on a shaft which is itself mounted for rotation using rolling element bearings lubricated only by the refrigerant which constitutes the working fluid of the chiller system. Apparatus is taught for providing liquid refrigerant to (1.) the bearings immediately upon chiller start-up, during chiller operation and during a coastdown period subsequent to shutdown of the chiller and (2.) the drive motor of the chiller's compressor for motor cooling purposes. By use of a variable speed-driven motor to drive the compressor, optimized part load chiller performance is achieved in a chiller which does not require or employ an oil-based lubrication system.

COOLING SYSTEM

CONTROL SYSTEM FOR AIR CONDITIONING AND/OR COOLING SYSTEM

COMPRESSOR

ENERGY CONTROLLER FOR WATER CHILLER

HEAT PUMP CONTROL SYSTEM

Arrangement for multi-stage heat pump assembly

REFRIGERATION PURGING SYSTEM

Refrigeration Purging System A purge system for use in a refrigeration system utilizing more than one condenser, each of which operates at different pressures. The purge system includes a purge chamber having a cooling coil connected to the evaporator and adapted to condense refrigerant vapor. The purge chamber is connected to a main purge refrigerant line which includes a pressure reducing device. Either condenser in the refrigeration system is provided with a secondary purge refrigerant line connected to the main purge refrigerant line and having a one-way valve to prevent refrigerant flow from one condenser to another condenser. A pump is mounted in the system to remove the non-condensibles from the purge system. The pump is operatively connected to a pressure switch arranged between two sampling pressure lines, one of which is extending to the purge chamber and another one is extending to the main purge refrigerant line at a point ahead of the pressure reducing device. The pump is actuated ...

EVAPORATOR INLET WATER TEMPERATURE CONTROL SYSTEM

... 078254-Y EVAPORATOR INLET WATER TEMPERATURE CONTROL SYSTEM : An evaporator inlet water temperature control system (80) for controlling the inlet water temperature of an evaporator utilized in an inverter driven centrifugal chiller. The system creates the proper chilled water set point at the evaporator outlet needed to maintain the inlet water at its set point for greater efficiency of operation. Control is accomplished by generating an electrical error signal (85) which is a function of an inlet water set point voltage and the actual inlet water temperature. A logic signal (93) is produced as a function of the error signal detected by the circuit and establishes a dead zone band representing a range in which the error signal is acceptable. Output of the control system is passed to the capacity control circuit (50) of an inverter driven centrifugal compressor chiller. When the inlet water temperature reaches its set point during pull-down, the logic output of the circuit (90) sets a flip-flop ...

HOT GAS BYPASS CONTROL FOR CENTRIFUGAL LIQUID CHILLERS

... 078253-Y HOT GAS BYPASS VALVE CONTROL FOR CENTRIFUGAL LIQUID CHILLERS: A control system and a method are disclosed for automatically controlling a hot gas bypass valve as a function of cooling load and head. A valve/controller(40) is provided for controlling the operation of the hot gas bypass valve (34) so as to avoid surging of the compressor in response to temperatures of the chilled liquid entering the evaporator, the chilled liquid leaving the evaporator, and the liquid refrigerant at the outlet of the condenser.

AUTOMATIC RESET OF CHILLED WATER SETPOINT TEMPERATURE CONTROL

AUTOMATIC RESET OF CHILLED WATER SETPOINT TEMPERATURE CONTROL A control system for controlling the reset of a leaving temperature setpoint of a refrigeration system. A microcomputer system receives two data pairs entered by an operator corresponding to the amount of reset at one load and another amount of reset at another load, and receives refrigeration system operating parameters indicative of entering chilled water temperature and leaving chilled water temperature. The microcomputer processes these signals to generate a reset for the leaving chilled water temperature setpoint.

A CENTRIFUGAL COMPRESSOR

A compact and efficient compressor is provided, based on using magnetic bearing technology, which can operate at high speed and comprises a reliable control system. The compressor of the present invention makes use of two separate compressors mounted on a single common motor, thus sharing a single drive. The balancing of the thrust at high RPM is improved by using a pair of electromagnetic bearings.

CONTROL FOR REFRIGERATION SYYSTEM CENTRIFUGAL COMPRESSOR

COAXIAL ECONOMIZER ASSEMBLY AND METHOD

A coaxial economizer (40) for use in a chiller system (20) comprising an inner housing (184) and an outer housing (186) having a common longitudinal axis. The outer housing has an inlet for receiving a fluid from a upstream compressor stage of a multistage compressor and an outlet for conveying a fluid to a downstream compressor stage of a multistage compressor. A flow chamber (160) forms a fluid flow path about the inner housing. A flash chamber (158) is coterminous with the flow chamber and flashes fluid in a liquid state to a gas state. A flow passage (156) between said flash chamber and the flow chamber for conveying a flashed gas from the flash chamber to the flow chamber; wherein the flashed gas conveyed from the flash chamber and the fluid received from the inlet of the outer housing mix along the fluid flow path toward the outlet of the outer housing.

CENTRIFUGAL REFRIGERANT VAPOUR COMPRESSORS

A centrifugal compressor for compressing a refrigerant vapour in a refrigeration cycle. The compressor comprises an impeller drive shaft (28)supported by first and second radial bearings (32) for rotation within the compressor housing and an impeller assembly including at least one centrifugal impeller wheel mounted on the impeller drive shaft to rotate with the impeller drive shaft. The first and second radial bearings are hydrodynamic fluid bearings in which the bearing fluid is the refrigerant vapour. The compressor further comprising a conduit (36) for supplying a portion of the refrigerant vapour from the impeller assembly to the first and second fluid bearings.

AUTOMATIC CHILLER STOPPING SEQUENCE

A control for a multiple chiller refrigeration system whereby a chiller can be stopped at a predetermined load in order that the remaining building load can be picked up by the remaining running chillers without exceeding set load capacities of the running chillers.

METHODS AND APPARATUSES FOR DETECTING SURGE IN CENTRIFUGAL COMPRESSORS

A surge detection system for use in a fluid system having a load driven by a centrifugal compressor (12), the compressor (12) being driven by an electric motor (20). The surge detection system comprises a means (38, 40) for sensing a differential pressure developed across the compressor (12) and a means (42) for sensing a current representing input power to the motor (20). The surge detection system further comprises a first computing means responsive to the differential pressure developed across the compressor (12) for indicating when a valid surge is occurring in the compressor (12), and a second computing means responsive to the variable speed drive current for indicating when a valid surge is occurring in the compressor (12).

Kälteanlage mit Kreiselverdichter.

Kälteanlage mit Kreiselverdichter.

Verfahren zum Betriebe von Kälteanlagen mit Kreiselverdichtern zum Verdichten des Kälteträgers.

Kälteanlage mit Kreiselverdichter.

Kühlverfahren.

Kälteanlage mit Kreiselverdichter.

Kälteanlage.

Kälteanlage mit Kreiselverdichter.

Wärmepumpenanlage mit Turboverdichtern, die bei ihrem Lauf mit gleichbleibender Drehzahl angetrieben werden.

Machine frigorifique.

Verfahren zum Betrieb einer Kompressionskühlanlage mit mindestens zweistufiger Kompression und Einrichtung zur Durchführung des Verfahrens

Kühlanlage und Verfahren zum Betrieb derselben

Anlage zum Komprimieren eines Gases

Installation frigorifique.

Machine à froid

Kälteanlage

Anlage zur Erzeugung von Kälte und/oder Wärme

Kältemaschine

Kältemaschine

Kältemaschine

Kältemaschine

Anlage zum Erzeugen von Kälte und/oder Wärme

Kälteanlage

Verfahren zur Kühlung des Kompressormotors einer Kältemaschine und Einrichtung zur Durchführung des Verfahrens

Kälteanlage

Kältemaschine und Verfahren zu ihrem Betrieb

KUEHLANLAGE.

Grosskälteerzeuger

Turbomaschine

Kältemittelventil zur Steuerung des Kältemittelstromes durch eine Öffnung zwischen einem Hoch- und einem Niederdruckteil einer Kältemaschine

Refrigeration plant - with compressor drive motor partly encased in evaporator housing

The two stage compressor has its motor and shaft between the elongated horizontal condenser and evaporator, parallel to each other and with the former above the latter, the shaft being perpendicular to a vertical plane crossing the evaporator parallel to its longitudinal axis. The compressor 1st stage intake is connected to the evaporator via an annular channel with adjustable guide vanes. The first stage of the compressor has two collector volutes and these are connected via internal pipes to the intake port of the second stage which has a single collector volute. The cooler for the compressor motor is fed with a bleed fraction of re-evaporated condensate from an intermediate evaporator chamber to which that bleed is fed. Compact, high thermal efficiency plant.

Compressor type refrigerator

The condenser is mounted above the evaporator and the connecting pipe between them for the refrigerant has a vertical or at least upward sloping section with a flow restrictor downstream of it in which there are two chokes, one causing 5-25% of the total pressure drop and the firest 95-75% of the drop and operating esp. on the critical flow regime whilst the other operates outside that regime. Increased thermodynamic efficiency is attained by limiting possibility of gas short circuit, to an amt. which maintains stability.

PROCEDURE FOR THE ENTERPRISE OF A REFRIGERANT PLANT AND A CONTROL DEVICE FOR THE EXECUTION OF THE PROCEDURE.

PROCEDURES FOR STEERING A TURBOCOMPRESSOR AS WELL AS DEVICE TO WOULD DRIVE THROUGH THE PROCEDURE.

Пневмодетандер

Использование: в системах сбора и подготовки природного газа на газовых и газоконденсатных промыслах. Задача: создание пневмодетандера с повышенными эффективностью и эксплуатационной надежностью, снижение (до 3000 об/мин) оборотов вращающихся частей, увеличение охлаждения газового потока и отделение жидкой фазы от природного газа. Сущность изобретения: пневмодетандер содержит корпус с расположенными внутри него камерами расширителя и компрессора, лопаточные аппараты расширителя и компрессора, вращающиеся в одну сторону, тракты подвода и отвода газов, систему смазки подшипников. Лопаточные аппараты расширителя и компрессора выполнены в виде зубчатых шестерен, которые размещены попарно, зацеплены друг с другом и выполнены с возможностью вращения в противоположные стороны. Шестерни установлены на разных приводных валах, соединенных между собой муфтами. 1 н.п. ф-лы, 6 з.п. ф-лы, 2 ил.

Oilless water chilling unit and air conditioning system

The suction piping for compressor, compression unit and refrigerator

Damping device for centrifugal water chilling unit

A centrifugal compressor

A compact and efficient compressor is provided, based on using magnetic bearing technology, which can operate at high speed and comprises a reliable control system. The compressor of the present invention makes use of two separate compressors mounted on a single common motor, thus sharing a single drive. The balancing of the thrust at high RPM is improved by using a pair of electromagnetic bearings.

Method for applying dual centrifugal compressors to refrigeration chiller unit and refrigeration plant, condensing appts.

Machine to be cooled

Compressor

REFRIGERATING PLANT

REFRIGERANT COOLED ELECTRIC MOTOR AND METHOD FOR COOLING A MOTOR

Apparatus of refrigeration

Apparatus of refrigeration

REFRIGERATION APPARATUS INCLUDING MOTOR COOLING MEANS

REFRIGERATION APPARATUS

cooling composition lìquida, and, refrigeration system incorporating a centrìfugo compressor.

IMPROVEMENTS IN CENTRIFUGAL COMPRESSORS.

LOW-OIL REFRIGERANTS AND VAPOR COMPRESSION SYSTEMS

A vapor compression system (20) has: a centrifugal compressor (22) having an inlet (40) and an outlet (42); and an electric motor (28) having a stator (30) and a rotor (32). A plurality of bearings (36) support the rotor. A refrigerant charge comprises a base refrigerant and one or more oils. The one or more oils are present at a total concentration of 80-5000 parts per million (ppm) by weight.

COMPRESSOR

A centrifugal type refrigerant compressor comprises at least one impeller (17, 18), electric motor (27) and drive shaft (22) mounted on non-lubricated radial bearings, such as magnetic or foil gas bearings (23, 24), with axial locating means (26) associated with the shaft (22) to restrict axial movement thereof with respect to the compressor housing (12). The housing (12) encases the motor (27) and the compressor and defines the gas inlet (31) and the gas outlet (16) passageways. Gas throttling means (34) is provided in the inlet (31), and a control means (30) varies the speed of the motor (27) and the throttling means (34) to control the compression ratio and mass flow through the compressor in accordance with the refrigeration load.

Mechanical control system for preventing compressor lubrication pump cavitation in a refrigeration system

A control system for operating a vapor compression refrigeration system to prevent oil pump cavitation during startup of the refrigeration system is disclosed. The control system includes a differential pressure switch which is connected on one side to a reservoir which is in fluidic communication with the refrigeration system evaporator or compressor suction line. The pressure switch is connected on its other side directly to the evaporator or compressor suction line. In operation, the reservoir fills with vaporous refrigerant from the refrigeration system when the refrigeration system is shut down and the vaporous refrigerant flows through a restrictor valve back to the refrigeration system at startup of the refrigeration system. The size of the reservoir and restrictor valve are selected so that the differential pressure switch is activated and a control is generated when too rapid a decrease in evaporator or compressor suction line pressure is detected. The control signal is supplied ...

Microcomputer system for controlling the capacity of a refrigeration system

A microcomputer system and method for controlling the capacity of a refrigeration system are disclosed. The microcomputer system receives electrical input signals indicative of operator selected settings and refrigeration system operating parameters. The microcomputer system processes these input signals to generate a control signal which is a step function of the temperature difference between a desired set point temperature and the sensed temperature of a heat transfer fluid cooled by operation of the refrigeration system. The width of each step of the step function is directly proportional to a selected capacity control response factor. By selecting different capacity control response factors, capacity control of the refrigeration system is tailored to meet specific job requirements of a particular job application for the refrigeration system.

Apparatus and method for controlling a magnetic bearing centrifugal chiller

A method for controlling operation of a centrifugal cooling apparatus, which has at least one of an evaporator, a centrifugal compressor having a magnetic bearing system, a condenser, and an expansion device, includes monitoring an operating condition of the magnetic bearing system, and controlling compressor flow stability based upon the operating condition of the magnetic bearing system.

CENTRIFUGAL COMPRESSOR WITH SURGE PREDICTION

A centrifugal compressor for a chiller includes a casing, an inlet guide vane, an impeller downstream of the inlet guide vane, a rotational magnetic bearing, a magnetic bearing sensor, a motor, a diffuser and a controller. The casing has inlet and outlet portions with the inlet guide vane disposed in the inlet portion. The impeller is attached to a shaft. The radial magnetic bearing rotatably supports the shaft. The magnetic bearing sensor detects at least one of a position signal indicative of the shaft's position and a current signal indicative of current supplied to the magnetic bearing. The motor rotates the shaft in order to rotate the impeller. The diffuser is disposed in the outlet portion downstream from the impeller. An outlet port of the outlet portion is disposed between the impeller and the diffuser. The controller is programmed to predict surge based on the position signal and/or the current signal. 1. A centrifugal compressor adapted to be used in a chiller , the centrifugal compressor comprising:a casing having an inlet portion and an outlet portion;an inlet guide vane disposed in the inlet portion;an impeller disposed downstream of the inlet guide vane, the impeller being attached to a shaft rotatable about a rotation axis,at least one radial magnetic bearing rotatably supporting the shaft;at least one magnetic bearing sensor arranged to detect at least one of a position signal indicative of the shaft's position and a current signal indicative of current supplied to the at least one magnetic bearing;a motor arranged and configured to rotate the shaft in order to rotate the impeller;a diffuser disposed in the outlet portion downstream from the impeller with an outlet port of the outlet portion being disposed between the impeller and the diffuser; anda controller programmed to predict surge based on the at least one of the position signal and the current signal.2. The centrifugal compressor according to claim 1 , whereinthe controller is further ...

De-superheater system and compression system employing such de-superheater system, and method of producing a pressurized and at least partially condensed mixture of hydrocarbons

A compressed vaporous discharge stream is de-superheated in a de-superheater system. The de-superheater system comprises a de-superheater heat exchanger configured to bring at least a portion of the compressed vaporous discharge stream in indirect heat exchanging contact with an ambient stream. A de-superheater bypass line comprising an temperature-controlled valve is configured to selectively bypass the de-superheater heat exchanger. A combiner is configured downstream of the de-superheater heat exchanger for rejoining the bypass portion with the portion of the compressed vaporous discharge stream that has passed through the de-superheater heat exchanger. A mixer is configured downstream of said combiner, to receive and mix the rejoined stream, and discharge the rejoined stream into a de-superheater discharge conduit as a de-superheated stream.

INLET GUIDE VANE MECHANISM

SYSTEM AND METHOD FOR STABILITY CONTROL IN A CENTRIFUGAL COMPRESSOR

LIQUID SENSING FOR REFRIGERANT-LUBRICATED BEARINGS

A vapor compression system comprises a compressor (22). The compressor comprises an inlet (40) and an outlet (42) and an electric motor (28). The motor has a stator (30) and a rotor (32). A plurality of bearings (36) support the rotor. A fluid flowpath (126) extends to the plurality of bearings. A branch (310) from the fluid flowpath extends to the compressor. A liquid sensor (330) is along the branch.

ТУРБОКОМПРЕССОРНЫЙ АГРЕГАТ

Турбокомпрессорный агрегат, предназначенный для работы в составе пропановой холодильной установки, включающий отделенные друг от друга защитной перегородкой метановый газотурбинный двигатель и пропановый центробежный компрессор, соответственно выходной и приводной валы которых через отверстие в защитной перегородке кинематически связаны посредством передаточного механизма, отличающийся тем, что передаточный механизм выполнен в виде муфты с внутренним, способным к вращению, соединительным элементом, связанным с выходным и приводным валами, и внешним опорным элементом, неподвижно установленным в защитной перегородке, а газотурбинный двигатель и центробежный компрессор выполнены так, что10000 Подробнее

Холодильная установка

Изобретение может быть использовано втурбокомпрессоростроении. Цель изобретения является повышение эксплуатационной надежности путем ускорения пуска турбокомпрессора с газостатистическими подшипниками. Цель достигается тем, что холодильная установка, содержащая турбо.- компрессор 1, установленный на подшипниках 2, конденсатор 3, промежуточный сосуд 4 с жидкостной и газдвой полостями 5 и 6, дроссель 11, испаритель 12, снабжена пусковой емкостью 7. жидкостная полость 9 которого сообщена посредством регулирующего вентиля 10 с жидкостной полостью 6 сосуда, а газовая полость 8 сообщена посредством обратного и предохранительного клапанов 15 и 16 соответственно с подшипниками 2 и выходом турбокомпрессора 1. которые сообщены между собой посредством второго регулирующего вентиля 14, связанного с реле перепада давления 17. 1 з.п. ф-лы, 1 ил.

DYNAMIC COMPRESSOR CONTROL SYSTEM

Kompressionskaeltemaschine, bei welcher die Verdichtung des als Kaeltetraeger verwendeten Wasserdampfes durch eine vielstufige Schleuderpumpe erfolgt

VERFAHREN UND VORRICHTUNG ZUR WIRKUNGSGRADVERBESSERUNG IN EINER KUEHLANLAGE

Verwendung von 1,1,1,3,3-Pentafluorbutan

The invention relates to the use of 1,1,1,3,3-pentafluorobutan (R365mfc) as a refrigerating agent in turbocompressors. By construction, the turbocompressors allow for high throughput while being characterised by small space- and material requirements. They are useful in commercial and industrial refrigerating facilities having a high throughput.

STEUERANLAGE FÜR KLIMATISIERUNGS- BZW. KÜHLUNGSSYSTEM

Improvements relating to refrigerating systems

... 943,490. Refrigerating. GARRETT CORPORATION. May 31, 1960 [June 1, 1959], No. 19263/60. Heading F4H. [Also in Division F1] In a closed-circuit refrigerating system, vapour can be returned from the condenser 6 to the inlet of the centrifugal compressor 1 via a bypass pipe 12. The flow through pipe 12 is controlled in accordance with the flow through the compressor discharge pipe 5 by means of a valve 13 actuated by a diaphragm 31 exposed on opposite sides to the pressures developed in a Pitot tube 34 and a static tube 33. Alternatively, the control is in accordance with pressure or temperature. The by-passed vapour enters the compressor inlet through nozzles 15 which impart a tangential component of flow to induce swirl in the incoming vapour. If the swirl is in the direction of rotation of the compressor impeller, it causes the compressor head to vary substantially in proportion to the load. If the swirl is in the opposite direction, the compressor head remains substantially constant. The ...

A method of operating a centrifugal compressor

A method of operating a centrifugal compressor, having variable position inlet guide vanes and impellers controlled by a variable speed motor, comprises the steps of operating the variable speed motor at a constant high speed; modulating the variable position of the inlet guide vanes until the variable position reaches a predetermined maximum position; and incrementally reducing the speed of the motor as long as the variable position of the inlet guide vanes remains at the predetermined maximum position.

Industrial refrigeration plant

... 1,061,323. Refrigerating. SULZER BROS. Ltd. June 28, 1965 [July 9, 1964], No. 27326/65. Heading F4H. The conventional base-plate for supporting the rotary motor-compressor unit 1 and evaporator 5 is omitted and instead the motorcompressor unit and evaporator are rigidly connected by means of the suction line 3 (Fig. 2, not shown) and a metal strap 6. The latter prevents relative movement between the compressor and evaporator vertically and transversely of the latter while permitting relative movement lengthwise of the evaporator. Supporting members 7 having vibration damping inserts 9 of elastomeric material are provided one at each end of the evaporator and one at the compressor. The condenser 10 is mounted on the evaporator by supports 12, 14 having an elastomeric insert 13 therebetween.

Refrigeration control

A microcomputer system 16-19 receives electrical input signals indicative of an operator selected temperature setpoint for water entering evaporator 5 and refrigeration system operating parameters indicative of water temperature entering the evaporator at 15 and of water temperature leaving the evaporator at 13. The microcomputer processes these input signals to generate a leaving water temperature control point which is a function of the entering water temperature setpoint and the temperature drop across the evaporator. The capacity of the system is thereby controlled by adjustment of vanes 12 to match the refrigeration load. ...

Improvements relating to closed cycle refrigeration systems

... 915,598. Refrigerating. GARRETT CORPORATION. Dec. 9, 1960 [Dec. 14, 1959], No. 42525/60. Class 29. In a closed cycle refrigeration system having a compressor 1 of a type liable to surging, a condenser 2, an evaporator 4, by-passing means 28, 29 for hot gas leaving the compressor to flow to the low pressure side of the closed circuit to prevent surging, a valve 15 to control and throttle the liquid refrigerant passing from the liquid receiver 3 to the evaporator 4 and to control simultaneously but in opposite sense the flow of hot gas through the by-pass, the valve is actuated by a linear actuator 16 driven by an electric motor 17 controlled by controller 18, the error signal to the controller being derived by a temperature responsive thermistor sensor 24. As shown, by-pass pipe 29 leads to the evaporator inlet, but in a modification (Fig. 1A, not shown), pipe 29 leads to the evaporator outlet, liquid refrigerant being fed through a restriction from receiver 3 to pipe 28 to prevent too high ...

A method of operating a centrifugl compressor

TEMPERATURE CONTROL SYSTEM FOR CENTRIFUGAL LIQUID CHILLING MACHINES

... 1401474 Automatic control of refrigeration systems BORG-WARNER CORP 12 Sept 1972 [17 Sept 1971] 42230/72 Heading G3R A refrigeration system, suitable for use in air conditioning a building, includes a compressor and two independent sensors responsive to refrigerant output temperature at two different times. As shown, freon refrigerant passes from a centrifugal compressor 16 driven by a motor 17, to a condenser 20, expansion device 22 and evaporator 24, before returning to the compressor. The evaporator 24 includes a heat exchanger 26 using water or other liquid, and the output line 26R contains a temperature sensing device 28 for transmitting an actual temperature signal to a regulator 32. The signal is compared with a reference voltage to produce an output signal which controls a motor 36 for setting vanes 13 in the compressor 16 and thus vary its capacity so as to regulate the output temperature. The regulator also supplies a temperature recorder 62 and receives an input from motor current ...

RESET OF CHILLED WATER TEMPERATURE CONTROL

Centrifugal compressor cooling path arrangement

An example compressor arrangement includes a first compressor portion configured to compress a fluid and a second compressor portion configured to compress the fluid more than the first compressor portion. The compressor arrangement also includes a motor disposed between the first compressor portion and the second compressor portion. The first compressor portion is configured to communicate the fluid to the second compressor portion along a primary flow path. The second compressor portion is configured to divert at least some of the fluid from the primary flow path, communicating the diverted fluid back to the first compressor portion along a secondary flow path.

HIGH EFFICIENCY COOLING SYSTEM

A cooling system has a cabinet and a plurality of separate cooling stages including an upstream cooling stage and a downstream cooling stage. At least the upstream cooling state is a variable capacity cooling stage. Each cooling stage has a cooling circuit. Evaporators of the cooling circuits are arranged in the cabinet so that air passes over them in serial fashion. A controller when a Call for Cooling first reaches a point where cooling is needed, operating the upstream cooling circuit to provide cooling and not the downstream cooling circuit. When the Call for Cooling has increased to a second point, the controller additionally operates the downstream cooling circuit to provide cooling. The cooling capacity at which the upstream cooling circuit is being operated is less than its full capacity when the Call for Cooling reaches the second point. 1. A cooling system , comprising:a cabinet having an air inlet and an air outlet;an air moving unit disposed in the cabinet;a plurality of separate cooling stages including an upstream cooling stage and a downstream cooling stage, at least the upstream cooling stage a variable capacity cooling circuit;each cooling stage including a cooling circuit having an evaporator, a condenser, a compressor and an expansion device;at least the cooling circuit of the upstream cooling stage having a pumped refrigerant economizer mode and a direct expansion mode wherein each cooling circuit that has both the pumped refrigerant economizer mode and the direct expansion mode also has a liquid pump wherein when that cooling circuit is operated in the direct expansion mode a compressor of that cooling circuit is on and compresses a refrigerant in a vapor phase to raise its pressure and thus its condensing temperature and refrigerant is circulated around the cooling circuit by the compressor of that cooling circuit and wherein when that cooling circuit is operated in the pumped refrigerant economizer mode the compressor of that cooling circuit ...

MULTI-STAGE COOLING SYSTEM WITH TANDEM COMPRESSORS AND OPTIMIZED CONTROL OF SENSIBLE COOLING AND DEHUMIDIFICATION

A cooling system has a plurality of separate cooling stages including an upstream cooling stage having an upstream cooling circuit and a downstream cooling stage including a downstream cooling circuit, which are each a direct expansion cooling circuit including a tandem compressor. Each tandem compressor includes a fixed capacity compressor and a variable capacity compressor. A controller controls the fixed capacity compressor and variable capacity compressor of each tandem compressor based on a Call for Cooling, which of a plurality of ranges the Call for Cooling falls within, and whether the Call for Cooling is ramping up or ramping down. 1. A cooling system , comprising:a cabinet having an air inlet and an air outlet;an air moving unit disposed in the cabinet;a plurality of separate cooling stages including an upstream cooling stage and a downstream cooling stage, the upstream cooling stage having an upstream cooling circuit and the downstream cooling stage having a downstream cooling circuit;the upstream and downstream cooling circuits are each a direct expansion refrigeration cooling circuit including an evaporator, a condenser, a tandem compressor and an expansion device, the evaporator having an inlet coupled to an outlet of the expansion device and an outlet coupled to an inlet of the tandem compressor, the tandem compressor having an outlet coupled to an inlet of the condenser and the condenser having an outlet coupled to an inlet of the expansion device;each tandem compressor including a fixed capacity compressor and variable capacity compressor;the evaporator of the upstream cooling circuit (upstream evaporator) and the evaporator of the downstream cooling circuit (downstream evaporator) arranged in the cabinet so that air to be cooled passes over them in serial fashion, first over the upstream evaporator and then over the downstream evaporator; anda controller coupled to the tandem compressors that controls the fixed capacity compressor and variable ...

REFRIGERATION SYSTEM FOR COOLING A CONTAINER

The invention present disclosure relates to a refrigeration system for cooling the interior of a mobile refrigerated space, for example a refrigerated container, comprising two speed-controlled compressors, which can be operated in parallel as a single stage or one after the other as two stages by means of one controllable bypass line per compressor and a controllable valve device between the pressure side and the suction side of each compressor. The valve devices receive signals from a controller having algorithms, into which the usage temperature and ambient temperature are fed as a target value or measured value. The most energy-efficient operating modes and the rotational speeds of the compressors result from the requirements profile of the container refrigeration. 1. A refrigeration system for cooling the interior of a mobile cooling chamber , for example of a cooling container , by lowering the temperature to a usable temperature and removing heat to a heat sink , comprising:a first and a second speed-regulated compressor;a gas cooler;at least one throttling point;at least one inner heat exchanger or an intermediate pressure liquid separator;an evaporator; andcontrollable valve devices;wherein the first compressor has a first bypass line which produces a flow connection from a pressure side of said compressor to a suction side thereof and in which a first controllable valve device with opening and closing functions is arranged,wherein the second compressor has a second bypass line which produces a flow connection from a pressure side of said compressor to a suction side thereof and a second controllable valve device with opening and closing functions is arranged, andwherein a third controllable valve device with opening and closing functions is arranged in a flow connection between the pressure side of the first compressor and the suction side of the second compressor,wherein there are means for activating the abovementioned valve devices, and there is a ...

TWO-STAGE PRESSURISING REFRIGERATION CYCLE DEVICE

A refrigerant discharge capacity of a high-pressure side compression mechanism and a refrigerant discharge capacity of a low-pressure side compression mechanism can be independently controlled, in a two-stage pressurizing refrigeration cycle device. The refrigerant discharge capacity of the low-pressure side compression mechanism is determined based on an outside air temperature, an air temperature at the evaporator, and a preset temperature. Furthermore, the refrigerant discharge capacity of the high-pressure side compression mechanism is determined based on the determined refrigerant discharge capacity of the low-pressure side compression mechanism such that an effective capacity ratio is not less than 1 nor more than 3. Therefore, in the two-stage pressurizing refrigeration cycle device, COP can be improved with a simple structure and control. 18-. (canceled)9. A two-stage pressurizing refrigeration cycle device comprising:a low-pressure side compression mechanism, which compresses a low-pressure refrigerant into a first intermediate-pressure refrigerant, and discharges the first intermediate-pressure refrigerant therefrom;a high-pressure side compression mechanism, which compresses the first intermediate-pressure refrigerant discharged from the low-pressure side compression mechanism into a high-pressure refrigerant to discharge the high-pressure refrigerant therefrom;a radiator, which exchanges heat between outdoor air and the high-pressure refrigerant discharged from the high-pressure side compression mechanism, to dissipate heat from the refrigerant;an intermediate-pressure expansion valve, which decompresses and expands the high-pressure refrigerant flowing from the radiator into a second intermediate-pressure refrigerant to flow the second intermediate-pressure refrigerant into a suction side of the high-pressure side compression mechanism;a low-pressure expansion valve, which decompresses and expands the high-pressure refrigerant flowing from the radiator ...

EFFICIENCY HEATING, VENTILATING, AND AIR CONDITIONING THROUGH INDIRECT EXTENSION OF COMPRESSOR RUN TIMES

A load control device for improving energy efficiency of a heating, ventilating, and air-conditioning (HVAC) system by controlling shed times of a compressor of the HVAC system. The load control device includes a compressor cutoff switch, a sensing circuit, and a processor. The processor determines a subsequent mandatory shed time based upon a previous shed time, a previous run time, and a minimum run time. A subsequent mandatory shed longer than the previous mandatory shed time causes a subsequent run time to be increased, thereby increasing system efficiency. 1. A load control device for improving energy efficiency of a heating , ventilating , and air-conditioning (HVAC) system by controlling shed times of a compressor of the HVAC system , the load control device comprising:a compressor cutoff switch comprising a first terminal connectable to a second terminal, the first terminal adapted to receive a control signal from a temperature control device of an HVAC system, the second terminal adapted to transmit the control signal to a device controlling power to a compressor of an HVAC system, compressor cutoff switch adapted to selectively cause an electrically-powered compressor of an HVAC system to be disconnected from a power source by disconnecting the first terminal from the second terminal and interrupting the transmission of the control signal to the device controlling power to the compressor;a sensing circuit in electrical communication with the second terminal of the compressor cutoff switch, the sensing circuit configured to detect the presence of the control signal and transmit a signal representative of the control signal; anda processor in electrical communication with the sensing circuit and the compressor cutoff switch, the processor configured to receive the signal representative of the control signal, to determine a subsequent mandatory shed time for a subsequent operating cycle of the compressor based on the run time and the shed time of the previous ...

HEAT SOURCE SYSTEM AND CONTROL METHOD THEREFOR

Provided is a heat source system that includes two heat source devices connected in series to a heat medium and can be efficiently operated. A heat source system () reduces the temperature of chilled water that is guided from a cooling load and has a predetermined return temperature Tr, to a predetermined supply temperature Ts, and supplies the chilled water to the cooling load. The heat source system () includes: a second centrifugal chiller (TR) that reduces the temperature of the chilled water from the return temperature Tr to an intermediate temperature T a first centrifugal chiller (TR) that reduces the temperature of the chilled water that has been reduced to the intermediate temperature T by the second centrifugal chiller (TR), to the supply temperature Ts; and a control unit () that variably sets the intermediate temperature T 1. A heat source system that changes a temperature of a heat medium that is guided from a heat load and has a predetermined return temperature , to a predetermined supply temperature , and supplies the heat medium to the heat load , the heat source system comprising:an upstream heat source device that changes the temperature of the heat medium from the return temperature to an intermediate temperature;a downstream heat source device that changes the temperature of the heat medium that has been changed to the intermediate temperature by the upstream heat source device, to the supply temperature; anda control unit that variably sets the intermediate temperature.2. The heat source system according to claim 1 , whereinthe upstream heat source device and/or the downstream heat source device is an electric centrifugal chiller, andthe control unit sets the intermediate temperature such that consumed power according to a load factor of the electric centrifugal chiller is equal to or less than a predetermined value.3. The heat source system according to claim 1 , whereinthe upstream heat source device and/or the downstream heat source device is ...

REFRIGERATION CYCLE APPARATUS AND REFRIGERATION CYCLE CONTROL METHOD

An integrated air-conditioning and hot-water-supply system includes a compressor, a plate-type water heat exchanger, a hot-water-supply pressure-reducing mechanism, and an outdoor heat exchanger. Moreover, the integrated air-conditioning and hot-water-supply system includes a high-pressure sensor that detects a high pressure in the compressor, and a controller that calculates a condensing temperature of the plate-type water heat exchanger based on the high pressure detected by the high-pressure sensor. When the calculated condensing temperature is higher than or equal to a preset target condensing-temperature value, the controller performs condensing-temperature control for controlling the operating frequency of the compressor based on a difference between the calculated condensing temperature and the target condensing-temperature value, and performs opening-degree control for controlling the opening degree of the hot-water-supply pressure-reducing mechanism concurrently with the condensing-temperature control based on a difference between a current opening degree of the hot-water-supply pressure-reducing mechanism and a preset target opening-degree value. 1. A refrigeration cycle apparatus comprising:a refrigeration cycle mechanism having a compressor whose operating frequency is controllable, a first radiator, a first pressure-reducing mechanism whose opening degree is controllable, and a first evaporator, wherein a refrigerant sequentially circulates through the compressor, the first radiator, the first pressure-reducing mechanism, and the first evaporator;a high-pressure sensor that detects a high pressure between a discharge side of the compressor and a liquid side of the first pressure-reducing mechanism; anda controller that controls the operating frequency of the compressor and controlling the opening degree of the first pressure-reducing mechanism based on a degree of subcooling of the first radiator, wherein,when a condensing temperature of the first ...

PHASE CHANGE MATERIAL EVAPORATOR CHARGING CONTROL

A method of controlling an air conditioning compressor in a heating ventilation and air conditioning system having a evaporator including a phase change material is presented. The method includes the steps of measuring an evaporator output air temperature, determining a state of charge value by calculating a difference between an estimated refrigerant temperature based on the evaporator output air temperature and a phase change material freeze temperature and integrating this difference over time and operating the air conditioning compressor to maintain the state of charge value between an upper and lower limit. A method of recovering braking energy in a vehicle containing a heating ventilation and air conditioning system having the evaporator including the phase change material is also presented. 1. A method of controlling an air conditioning (A/C) compressor in a heating ventilation and air conditioning (HVAC) system having an evaporator including a phase change material , said method comprising the steps of:measuring an evaporator output air temperature (EOAT);determining a state of charge (SoC) value based on said EOAT;determining an upper limit value and a lower limit value for the SoC;initiating operation of the A/C compressor when the SoC value is less than or equal to said lower limit value; anddiscontinuing operation of the A/C compressor when the SoC value is greater than or equal to said upper limit value.2. The method according to claim 1 , further comprising the steps of:determining whether the HVAC system is operating in a defog mode; andoperating the A/C compressor according to a freeze control method when the HVAC system is operating in said defog mode.3. The method according to claim 1 , further comprising the steps of:determining a humidity value within a vehicle cabin; andoperating the A/C compressor according to a freeze method when said humidity value exceeds a threshold.4. The method according to claim 1 , further comprising the steps of: ...

REFRIGERATION CYCLE APPARATUS AND REFRIGERATION CYCLE CONTROL METHOD

A combined air-conditioning and hot water supply system includes a refrigeration cycle mechanism, a hot water storage tank, and a controller. The refrigeration cycle mechanism has a compressor whose operating frequency can be controlled, a plate water-heat exchanger that heats water, a hot water supply pressure-reducing mechanism, and an outdoor heat exchanger. The controller includes a clock section, a computing section, a memory section, and a controlling section. The clock section measures time. The computing section calculates the actual hot water supply load. The memory section stores information related to the hot water supply load calculated by the computing section. The controlling section controls the operating frequency of the compressor based on the quantity of heat storage, the hot water supply load, and a preset hot water supply time. 110-. (canceled)11. A refrigeration cycle apparatus in which a refrigerant is circulated , comprising:a refrigeration cycle mechanism that has a compressor whose operating frequency can be controlled, a first radiator that supplies heat by means of the refrigerant to tank water that is water stored in a hot water storage tank, a first pressure-reducing mechanism, and a first evaporator, the refrigerant circulating in an order of the compressor, the first radiator, the first pressure-reducing mechanism, and the first evaporator; anda controller, a memory section configured to store control period information indicating a preset control period, and be capable of storing other information,', 'a computing section configured to calculate a heat consumption on a time period basis, the heat consumption indicating a quantity of heat that has been supplied to an outside by the tank water within the time period, the time period being one of divided predetermined time period of a day, store the calculated heat consumption and a corresponding point in time into the memory section, and compute current heat storage in the tank water, ...

MULTI TYPE AIR CONDITIONER AND COOLING AND HEATING CONTROL METHOD THEREOF

A cooling and heating control method of a multi type air conditioner in which a target pressure of a compressor is adjusted based on conditions of respective indoor units so as to reduce power consumption is provided. The cooling control method includes determining the indoor unit desired to execute power saving control, judging whether or not a difference between a temperature of a space in which the indoor unit desired to execute power saving control is located and a set temperature of the indoor unit is less than a reference value, raising a target evaporation temperature of the indoor unit upon judging that the difference is less than the reference value, comparing an evaporation temperature of the indoor unit with the raised target evaporation temperature, and raising an evaporation pressure of a compressor, when the evaporation temperature of the indoor unit is lower than the raised target evaporation temperature. 1. A cooling control method of a multi type air conditioner including a compressor and plural indoor units , the cooling control method comprising:determining the indoor unit desired to execute power saving control among the plural indoor units;judging whether or not a difference between a temperature of a space in which the indoor unit desired to execute power saving control is located and a set temperature of the indoor unit desired to execute power saving control is less than a reference value, when the indoor unit desired to execute power saving control is determined;raising a target evaporation temperature of the indoor unit desired to execute power saving control upon judging that the difference is less than the reference value;comparing an evaporation temperature of the indoor unit desired to execute power saving control with the raised target evaporation temperature; andraising an evaporation pressure of the compressor, when the evaporation temperature of the indoor unit desired to execute power saving control is lower than the raised target ...

CRANK CASE HEATER CONTROL

A control system for a crank case heater for an inverter operated compressor of a cooling system includes a contactor operably connected to the crank case heater and an inverter controller compressor and at least one compressor temperature sensor disposed at the compressor to sense a compressor temperature and an compressor internal temperature sensor. A controller is operably connected to the crank case heater and the at least one compressor temperature sensor and configured to close the contactor to energize the crank case heater independently from operation of the compressor when the at least one compressor temperature sensor senses a compressor temperature below a desired threshold. 1. A control system for a crank case heater for a compressor of a cooling system comprising:a contactor operably connected to the crank case heater, the inverter and indirectly to the compressor;at least one compressor temperature sensor disposed at the compressor to sense a compressor temperature;a first temperature switch located in air space; anda controller operably connected to the crank case heater and the at least one compressor temperature sensor and configured to close the contactor to energize the crank case heater when the at least one compressor temperature sensor senses a compressor temperature below a desired threshold; anda second temperature switch located at a discharge line of the compressor to energize the crank case heater when a discharge line temperature is below a desired lower limit and the compressor is not operating.2. The control system of claim 1 , wherein the controller is operably connected to the compressor.3. The control system of claim 2 , wherein the controller is configured to energize the compressor independently of the crank case heater via the second temperature switch.4. The control system of claim 2 , wherein the controller is operably connected to the compressor via the inverter.5. The control system of claim 1 , wherein at least one ...

Flexible Use of an Inverter in a Refrigeration Unit

A control system for a refrigeration unit being powered by a power source and having a compressor, an inverter and an evaporator fan is provided. The control system may include a first switch configured to selectively couple the compressor with one of the power source and the inverter, a second switch configured to selectively couple the evaporator fan with one of the power source and the inverter, and a controller operatively coupled to the first and second switches. The controller may be configured to engage the first and second switches into one of a first state and a second state based on a triggering event. In the first state, the first switch may be configured to couple the compressor with the power source and the second switch may be configured to couple the evaporator fan with the inverter. In the second state, the first switch may be configured to couple the compressor with the inverter and the second switch may be configured to couple the evaporator fan with the power source. 1. A control system for a refrigeration unit being powered by a power source and having a compressor , an inverter and an evaporator fan , the control system comprising:a first switch configured to selectively couple the compressor with one of the power source and the inverter;a second switch configured to selectively couple the evaporator fan with one of the power source and the inverter; anda controller operatively coupled to the first and second switches and configured to engage the first and second switches into one of a first state and a second state based on a triggering event, the first switch being configured to couple the compressor with the power source and the second switch being configured to couple the evaporator fan with the inverter in the first state, the first switch being configured to couple the compressor with the inverter and the second switch being configured to couple the evaporator fan with the power source in the second state.2. The control system of claim 1 , ...

REFRIGERATING APPARATUS

A refrigerating apparatus includes first and second refrigerant circuits including respective first and second compressors, condensers, pressure reducers, and evaporators, connected circularly with first and second refrigerant pipes, respectively, refrigerants discharged from the first and second compressors being respectively condensed at the first and second condensers and thereafter respectively evaporated at the first and second evaporators to acquire a cooling effect; a temperature sensor that detects a temperature of an internal portion of a cold storage cabinet, the first and second evaporators being disposed to cool the internal portion simultaneously; and a first control device that controls the first and second compressors such that the first compressor and the second compressor start being alternately operated each time a temperature detected by the temperature sensor reaches a first temperature, and are continuously operated until the detected temperature reaches a second temperature lower than the first temperature. 1. A refrigerating apparatus comprising:a first refrigerant circuit including a first compressor, a first condenser, a first pressure reducer, and a first evaporator, connected circularly with a first refrigerant pipe, a refrigerant discharged from the first compressor being condensed at the first condenser and thereafter evaporated at the first evaporator to acquire a cooling effect;a second refrigerant circuit including a second compressor, a second condenser, a second pressure reducer, and a second evaporator, connected circularly with a second refrigerant pipe, a refrigerant discharged from the second compressor being condensed at the second condenser and thereafter evaporated at the second evaporator to acquire a cooling effect;a temperature sensor configured to detect a temperature of an internal portion of a cold storage cabinet, the first evaporator and the second evaporator being disposed to cool the internal portion at the same ...

REFRIGERATION APPARATUS

A refrigeration apparatus includes a high-temperature side circulation circuit, a low-temperature side circulation circuit, a cascade capacitor, and control means. The high-temperature side circulation circuit forms a refrigerant circuit in which a high-temperature side compressor, a high-temperature side condenser, a high-temperature side expansion device, and a high-temperature side evaporator are connected by a pipe. The refrigerant circuit allows a high-temperature side refrigerant to circulate therethrough. The high-temperature side refrigerant has a carbon-carbon double bond in its molecular structure. The high-temperature side compressor has a variable discharge capacity and is configured to discharge the high-temperature side refrigerant. The low-temperature side circulation circuit forms a refrigerant circuit in which a low-temperature side compressor, a low-temperature side condenser, a low-temperature side expansion device, and a low-temperature side evaporator are connected by a pipe. The refrigerant circuit allows a low-temperature side refrigerant to circulate therethrough. The low-temperature side refrigerant contains carbon dioxide. 1. A refrigeration apparatus comprising:a high-temperature side circulation circuit that forms a refrigerant circuit in which a high-temperature side compressor, a high-temperature side condenser, a high-temperature side expansion device and a high-temperature side evaporator are connected by a pipe, wherein the refrigerant circuit allows a high-temperature side refrigerant to circulate therethrough, the high-temperature side refrigerant has a carbon-carbon multiple bond in its molecular structure, and the high-temperature side compressor has a variable capacity and is configured to discharge the high-temperature side refrigerant;a low-temperature side circulation circuit that forms a refrigerant circuit in which a low-temperature side compressor, a low-temperature side condenser, a low-temperature side expansion device ...

REFRIGERATION APPARATUS

The refrigeration apparatus includes a controller. The controller performs normal operation control for controlling drive of the exterior fan and the compressor in order to bring the interior temperature to a target temperature, dehumidification control in which the interior humidity is adjusted to a predetermined target range of the high-humidity region, and power-saving control which is implemented by the control of drive of the exterior fan and the compressor such that a change in the interior temperature is kept within a temperature range based on the target temperature. The controller switches from the dehumidification control to the power-saving control in the case where the interior humidity has become a lower limit value of the target range of the high-humidity region or less. 1. A refrigeration apparatus comprising:a cooling heat exchanger for cooling an interior;a fan mechanism that generates a flow of air for cooling the cooling heat exchanger;a compressor that compresses a refrigerant;a refrigerant circuit to which the cooling heat exchanger and the compressor are connected and which is for performing a refrigeration cycle with the refrigerant that is circulated;a humidity detection unit that detects a humidity of interior air;a temperature detection unit that detects a temperature of interior air; anda control unit that performs normal operation control for controlling drive of the fan mechanism and the compressor in order to bring an interior temperature detected by the temperature detection unit to a target temperature, dehumidification control for adjusting a humidity detected by the humidity detection unit to a predetermined target range of high-humidity region, and power-saving control which is implemented by the control of drive of the fan mechanism and the compressor such that a change in the interior temperature within a temperature range is tolerated, the temperature range being based on the target temperature, whereinthe control unit switches ...

Refrigerant Compressor

In order to improve a refrigerant compressor comprising a drive motor and a compressor unit which compresses a refrigerant entering through a suction inlet and allows it to exit through a pressure outlet in such a way that it works as reliably as possible, it is proposed that the refrigerant compressor comprise a compressor monitoring system which is integrated into a compressor control system and which determines a compressor condition by means of a first condition value that corresponds to a first saturation temperature in the suction inlet and a second condition value that corresponds to a second saturation temperature in the pressure outlet, and which compares the compressor condition with permissible compressor conditions lying in a given deployment field of a deployment diagram and initiates a process of switching-off the refrigerant compressor if the compressor condition departs from the deployment field. 1. A refrigerant compressor comprisinga drive motor anda compressor unit which compresses a refrigerant entering through a suction inlet and allows it to exit through a pressure outlet,the refrigerant compressor comprising a compressor monitoring system which is integrated into a compressor control system and which determines a compressor condition by means of a first condition value that corresponds to a first saturation temperature in the suction inlet and a second condition value that corresponds to a second saturation temperature in the pressure outlet, and which compares the compressor condition with permissible compressor conditions lying in a given deployment field of a deployment diagram and initiates a process of switching-off the refrigerant compressor if the compressor condition departs from the deployment field.2. A refrigerant compressor in accordance with claim 1 , wherein the deployment field of the permissible compressor conditions is stored in a memory of the compressor monitoring system such as to be unchangeable by the user.3. A ...

Startup Control Systems And Methods For High Ambient Conditions

A refrigeration system includes a startup mode control module that receives at least one parameter associated with operation of a compressor of the refrigeration system, determines whether the at least one parameter indicates that the compressor is in a high ambient temperature startup condition, and selects, based on the determination, between a normal startup mode and a high ambient temperature startup mode. A compressor control module operates the compressor in the normal startup mode in response to the startup mode control module selecting the normal startup mode, operates the compressor in the high ambient temperature startup mode in response to the startup mode control module selecting the high ambient temperature startup mode, and transitions from the high ambient temperature startup mode to the normal startup mode after a predetermined period associated with operating in the high ambient temperature startup mode. 1. A refrigeration system , comprising:a startup mode control module that receives at least one parameter associated with operation of a compressor of the refrigeration system, determines whether the at least one parameter indicates that the compressor is in a high ambient temperature startup condition, and selects, based on the determination, between a normal startup mode and a high ambient temperature startup mode; and operates the compressor in the normal startup mode in response to the startup mode control module selecting the normal startup mode,', 'operates the compressor in the high ambient temperature startup mode in response to the startup mode control module selecting the high ambient temperature startup mode, and', 'transitions from the high ambient temperature startup mode to the normal startup mode after a predetermined period associated with operating in the high ambient temperature startup mode., 'a compressor control module that'}2. The refrigeration system of claim 1 , wherein the compressor control module operates the compressor at ...

TURBO MACHINE AND REFRIGERATING CYCLE APPARATUS

A turbo machine of the present disclosure includes a rotation shaft, a first bearing, a casing, an impeller, a first space, a second space, a storage tank, a first outlet passage, a supply passage, a pump, a main passage, and a sub-passage. The second space is in communication with a space formed between a bearing surface of the first bearing and an outer surface of the rotation shaft. The main passage is in communication with the second space and extends in the rotation shaft from an end of the rotation shaft in an axial direction of the rotation shaft. The sub-passage is formed in the rotation shaft and allows communication between the space between the bearing surface of the first bearing and the outer surface of the rotation shaft and the main passage. 1. A turbo machine comprising:a rotation shaft;a first bearing that supports the rotation shaft at least in a radial direction of the rotation shaft;a casing that forms a suction space into which a working fluid flows;an impeller that is fixed to the rotation shaft in the casing and that compresses the working fluid flowed into the suction space to discharge the working fluid outside the casing by rotation of the rotation shaft;a first space that is formed around the rotation shaft at a position between the impeller and the first bearing in an axial direction of the rotation shaft, that is in communication with a space formed between a bearing surface of the first bearing and an outer surface of the rotation shaft, and that stores a lubricating liquid;a second space that is formed on an opposite side of the first bearing from the impeller in the axial direction of the rotation shaft, that is in communication with the space formed between the bearing surface of the first bearing and the outer surface of the rotation shaft, and that stores the lubricating liquid;a storage tank that stores the lubricating liquid;a first output passage that allows communication between an inner space of the storage tank and the first ...

CONTROL UNIT

In order to improve a control unit for operating a refrigerant compressor system, wherein the refrigerant compressor system has a first refrigerant line system for expanded refrigerant, a second refrigerant line system for compressed refrigerant, and at least one refrigerant compressor, which operates between the first refrigerant line system and the second refrigerant line system and is driven by its own motor, and wherein the control unit has an operating unit, such that it is operable in a user-friendly manner, it is proposed that the operating unit should have a memory for image element data, for representing at least one component of the refrigerant compressor system, that the operating unit should have a display unit which, using the image element data of the at least one component of the refrigerant compressor system, displays this at least one component on the display unit, as a component image element. 1. A control unit for operating a refrigerant compressor system , wherein the refrigerant compressor system has a first refrigerant line system for expanded refrigerant , a second refrigerant line system for compressed refrigerant , and at least one refrigerant compressor , which operates between the first refrigerant line system and the second refrigerant line system and is driven by its own motor , and wherein the control unit has an operating unit ,the operating unit has a memory for image element data, for representing at least one component of the refrigerant compressor system, the operating unit has a display unit which, using the image element data of the at least one component of the refrigerant compressor system, displays this at least one component on the display unit, as a component image element.2. A control unit according to claim 1 , wherein the component includes at least one refrigerant compressor claim 1 , and in that claim 1 , using the image element data of the at least one refrigerant compressor claim 1 , the operating unit represents this ...

VARIABLE STAGE COMPRESSORS

A centrifugal compressor includes a first stage and a second stage. At least one of the first stage and the second stage includes an impeller and a shroud spaced from the impeller and configured to guide a fluid flow through the impeller. The shroud is selectively moveable between an engaged position and a disengaged position. 1. A centrifugal compressor , comprising:a first stage; anda second stage, wherein at least one of the first stage and the second stage includes an impeller and a shroud spaced from the impeller and configured to guide a fluid flow through the impeller, wherein the shroud is selectively moveable between an engaged position and a disengaged position.2. The centrifugal compressor as recited in claim 1 , wherein the impeller is rotatbable about an axis claim 1 , and the shroud is selectively moveable in the axial direction relative to the axis between the engaged position and the disengaged position.3. The centrifugal compressor as recited in claim 1 , wherein the impeller is rotatbable about an axis claim 1 , and the shroud is selectively moveable in the radial direction relative to the axis between the engaged position and the disengaged position.4. The centrifugal compressor as recited in claim 1 , comprising:a control system configured to move the shroud between the engaged position and the disengaged position.5. The centrifugal compressor as recited in claim 1 , wherein the outer surface of the shroud forms a convex surface.6. A method of compressing a refrigerant in a centrifugal compressor claim 1 , the method comprising:determining an efficiency of a first stage of a compressor and an efficiency of a second stage of a compressor; anddisengaging one of the first stage and the second stage based on the determining by moving a shroud away from an impeller.7. The method as recited in claim 6 , wherein the centrifugal compressor is a multi-stage centrifugal compressor.8. The method as recited in claim 6 , wherein the impeller is rotatable ...

REFRIGERATION CYCLE DEVICE

A refrigerant circuit includes a first compressor, a second compressor, a heat-source-side heat exchanger, an expansion mechanism, and a use-side heat exchanger. The refrigerant circuit is capable of performing a single-stage compression operation in which one of the first compressor and the second compressor is driven and the other is stopped, and a two-stage compression operation in which both the first compressor and the second compressor are driven. The control unit controls the refrigerant circuit so that, of the single-stage compression operation and the two-stage compression operation, an operation with a higher compression efficiency is performed. 1. A refrigeration cycle device comprising:a refrigerant circuit including a first compressor, a second compressor, a heat-source-side heat exchanger, an expansion mechanism, and a use-side heat exchanger, and capable of performing a single-stage compression operation in which one of the first compressor and the second compressor is driven and an other is stopped, and a two-stage compression operation in which both the first compressor and the second compressor are driven; anda control unit configured to control the refrigerant circuit so that, of the single-stage compression operation and the two-stage compression operation, an operation with a higher compression efficiency is performed.2. The refrigeration cycle device according to claim 1 , whereinthe control unit is configured to control the refrigerant circuit so that the single-stage compression operation is performed if a required capacity of the refrigerant circuit is below a predetermined capacity threshold, and control the refrigerant circuit so that the two-stage compression operation is performed if the required capacity of the refrigerant circuit is not below the capacity threshold, andthe capacity threshold is a value that changes in accordance with a physical quantity correlated with a difference between a high pressure and a low pressure in the ...

OIL TANK OF TURBO CHILLER COMPRESSOR AND TURBO CHILLER COMPRESSOR

Provided is an oil tank of a turbo chiller compressor whose heater can be replaced or checked without removing oil from an oil tank and removing refrigerant from a turbo chiller, and a turbo chiller compressor. An oil tank () of a turbo chiller compressor (A) includes a bottom plate () and side plates () standing upright so as to extend upward from an outer peripheral edge portion of the bottom plate (). The oil tank () forms a bottom portion of a casing () forming the turbo chiller compressor (A), a through-hole () is formed so as to penetrate the side plate () in a plate thickness direction, a protective tube () closed at a tip end thereof is inserted into the through-hole (), and a rod-shaped heater () configured to be able to be pulled out from the protective tube () and be inserted into the protective tube () is inserted into the protective tube (). 110-. (canceled)11. An oil tank of a turbo chiller compressor , comprising:a bottom plate; anda side plate standing upright so as to extend upward from an outer peripheral edge portion of the bottom plate,the oil tank forming a bottom portion of a casing forming the turbo chiller compressor, whereinin the bottom plate, a hole is formed so as to extend from one end surface of the bottom plate toward the other end surface of the bottom plate opposite to the one end surface,a rod-shaped heater configured to be able to be pulled out from the hole and be inserted into the hole is inserted into the hole, anda plurality of heat transfer fins are formed so as to protrude upward from an upper surface of the bottom plate.12. The oil tank of a turbo chiller compressor according to claim 11 , whereina space between the hole and the heater is filled with heat transfer fluid having a high coefficient of thermal conductivity.13. A turbo chiller compressor comprising:{'claim-ref': {'@idref': 'CLM-00011', 'claim 11'}, 'the oil tank of a turbo chiller compressor according to .'}14. A turbo chiller comprising:{'claim-ref': {'@idref': ...

Turbo compressor and centrifugal chiller comprising same

Provided are a turbo compressor and a centrifugal chiller comprising the same with which the length of a shaft in an axial direction can be shortened, rotational shake accompanying rotation of the shaft is suppressed, and a device can be made small. A turbo compressor comprising: a compressor part which compresses refrigerant; a shaft (15) which drives the compressor part around an axis of rotation X; a magnetic bearing (30A) which has provided thereto an iron core part (32) comprising a plurality of teeth parts (34) formed at equiangular intervals around the axis of rotation X, and, a plurality of coils (36) respectively wound around the plurality of teeth parts (34), and said magnetic bearing (30A) allows the shaft (15) to pass through and supports said shaft (15) without contacting the same; an auxiliary bearing which allows the shaft (15) to pass through; and a displacement sensor (50) which detects displacement of the shaft (15), wherein the displacement sensor (50) is provided between neighboring coils (36).

REFRIGERATION CYCLE APPARATUS

When a refrigerant leakage sensor detects a leakage of refrigerant, a refrigerant recovery operation is started. In the refrigerant recovery operation, recovery of refrigerant in an accumulator and a pump down operation are performed in a stepwise manner. In recovery of refrigerant in the accumulator, refrigerant in a liquid phase is accumulated in the accumulator as a result of circulation of refrigerant by operating a compressor in the state where a liquid shut-off valve and a gas shut-off valve are opened. After recovery of refrigerant in the accumulator is ended, the refrigerant in a liquid phase is accumulated in an outdoor heat exchanger by the pump down operation for operating the compressor in the state where the liquid shut-off valve is closed. 1. A refrigeration cycle apparatus equipped with an outdoor unit and at least one indoor unit , the refrigeration cycle apparatus comprising:a compressor;an accumulator provided on a suction side for refrigerant relative to the compressor;an outdoor heat exchanger provided in the outdoor unit;an indoor heat exchanger provided in the indoor unit;an expansion valve;an indoor fan provided corresponding to the indoor heat exchanger;a leakage sensor for refrigerant;a circulation path of the refrigerant, the circulation path being located in the outdoor unit and the indoor unit to include the compressor, the accumulator, the expansion valve, the outdoor heat exchanger, and the indoor heat exchanger;a first shut-off valve provided in a path that connects the outdoor heat exchanger and the indoor heat exchanger without passing through the compressor in the circulation path; anda controller configured to control an operation of the refrigeration cycle apparatus, whereinwhen the leakage sensor detects a leakage of the refrigerant, a first refrigerant recovery operation and a second refrigerant recovery operation are performed in a state where the circulation path is formed in a direction in which the refrigerant discharged ...

SYSTEM AND METHOD FOR CONTROLLING A VARIABLE-CAPACITY COMPRESSOR

A climate-control system is provided that includes a variable-capacity compressor unit and a control module controlling the compressor unit. The compressor unit is operable in a first capacity mode and in a second capacity mode that is higher than the first capacity mode. The control module may be configured to switch the compressor unit among a shutdown state, the first capacity mode and the second capacity mode based on a demand signal and a number of times that the compressor unit has been switched into the shutdown state within a predetermined time period.

Refrigerating machine and control method thereof

A refrigerating machine which is equipped with: a turbocompressor 2 that compresses a refrigerant; a condenser 3 that condenses the refrigerant compressed by the turbocompressor 2; an intermediate cooler 4 that is a plate heat exchanger which performs heat exchange between the liquid refrigerant introduced from the condenser 3 and the two-phase refrigerant obtained by expanding, with a sub-expansion valve 13, part of the liquid refrigerant introduced from the condenser 3; a main expansion valve 5 that expands the liquid refrigerant introduced from the intermediate cooler 4; and an evaporator 7 that evaporates the refrigerant introduced from the main expansion valve 5. The plate heat exchanger includes 80 or more laminated plates, the width of which is 100-400 mm and the height of which is 300-1000 mm.

VEHICLE AIR CONDITIONING CONTROL METHOD AND VEHICLE AIR CONDITIONING DEVICE

During control of an air-conditioning for a vehicle, when a torque to the engine is outputted that satisfies a total value of drive torques of the vehicle and an air-conditioning compressor, a minimum discharge capacity is set when fuel to the engine is cut. An assessment is made as to whether or not the discharge capacity needs to be changed from the minimum discharge capacity in accordance with the state inside the cabin. The discharge capacity is changed from the minimum discharge capacity to an upper limit capacity that is allowed during normal operation upon accessing that the discharge capacity needs to be changed from the minimum discharge capacity. After a predetermined time elapses following the changing of the discharge capacity, the discharge capacity is changed from the upper limit capacity to a discharge capacity that corresponds to the state inside the cabin. 1. A vehicle air-conditioning control method for a vehicle having an air-conditioning compressor driven by an engine and capable of changing a discharge capacity in which the discharge capacity is adjusted in accordance with a state inside a cabin , the vehicle air-conditioning control method comprising:outputting a torque to the engine that satisfies a total value of a drive torque of the vehicle and a drive torque of the air-conditioning compressor;setting a minimum capacity of the discharge capacity when fuel to the engine is cut;assessing whether or not the discharge capacity needs to be changed from the minimum capacity in accordance with the state inside the cabin;changing the discharge capacity from the minimum capacity to an upper limit capacity allowed during normal operation upon accessing that the discharge capacity needs to be changed from the minimum capacity; andafter a predetermined time elapses following the changing of the discharge capacity, changing the discharge capacity from the upper limit capacity to a discharge capacity that corresponds to the state inside the cabin.2. The ...

Discharge Pressure Calculation From Torque In An HVAC System

A method for determining discharge pressure for a compressor operatively connected to a condenser, an expansion device, and an evaporator in a serial relationship, includes receiving information indicative of a compressor torque or compressor current; and determining a discharge pressure in response to the receiving of the information.

CONTROL OF AN AUTOMOTIVE AIR CONDITIONING SYSTEM WITH AIR REHEATING BASED ON INTERNAL COMBUSTION ENGINE COOLANT FLOW CONTROL

An automotive air conditioning system comprising: an air cooling circuit including a compressor, a condenser, an expansion valve and an evaporator, fluidically connected to be flowed, during operation, by a heat transfer fluid, and a blower fan associated with the evaporator and operable to generate an airflow through the evaporator; an air heating circuit including a liquid/air heater configured to be flowed, during operation, by a heat transfer fluid and arranged close to the evaporator to be flowed also by the airflow generated by the blower fan associated with the evaporator, and a flow rate regulation solenoid valve arranged to regulate the flow rate of the heat transfer fluid through the heater; and an electronic control unit configured to receive a measured evaporator air temperature and a set cabin air temperature and to switch an operating condition of the compressor when the measured evaporator air temperature exhibits a given relation with at least one on/off threshold temperature computed, in at least certain operating conditions, based on the set cabin air temperature. 1. An automotive air conditioning system comprising:an air cooling circuit including a compressor, a condenser, an expansion valve and an evaporator, fluidically connected to be flowed through, during operation, by a heat transfer fluid, and a blower fan associated with the evaporator and operable to generate an airflow through the evaporator;an air heating circuit including a liquid/air heater configured to be flowed through, during operation, by a heat transfer fluid, and arranged close to the evaporator to be also flowed through by the airflow generated by the blower fan associated with the evaporator, and a flow rate regulation solenoid valve arranged to regulate the flow rate of the heat transfer fluid through the heater; andan electronic control unit configured to receive a measured evaporator air temperature and a set cabin air temperature and to switch an operating condition of ...

MULTI-STAGE CONTROL FOR ELECTROMECHANICAL HEATING, VENTILATION, AND AIR CONDITIONING (HVAC) UNIT

A control system for a heat transfer circuit, an HVAC unit containing a heat transfer circuit, and a method of retrofitting an HVAC unit are described. The control system includes a thermostat having a first cooling stage signal output terminal and a second cooling stage signal output terminal; a controller electrically connected to the thermostat; a sensor electrically connected to the controller; and a switch electrically connected to the controller, and that receives a first cooling stage signal output from the thermostat. The switch is in a first state when a sensor value from the sensor is less than a threshold, and a second state when the sensor value from the sensor is greater than or equal to the threshold. 1. A control system for a heat transfer circuit , comprising:a thermostat having a first cooling level signal output terminal and a second cooling level signal output terminal;a controller electrically connected to the thermostat;a sensor electrically connected to the controller; anda switch electrically connected to the controller, and that receives a first cooling level signal output from the thermostat, wherein the switch is in a first state when a sensor value from the sensor is less than a threshold, and a second state when the sensor value from the sensor is greater than or equal to the threshold, andwherein the first cooling level signal output enables a first cooling stage or a second cooling stage and a second cooling level signal output enables a third cooling stage.2. The control system according to claim 1 , wherein the switch is electrically connected to a first compressor and a second compressor claim 1 , such that when the switch is in the first state claim 1 , the first compressor receives the first cooling level signal output from the thermostat.3. The control system according to claim 2 , wherein when the switch is in the second state claim 2 , the second compressor receives the first cooling level signal output from the thermostat.4. ...

HEAT PUMP AND CONTROL METHOD THEREOF

A heat pump and a control method thereof, the control method of the heat pump which heats a heated space through heat exchange between outdoor air and a refrigerant and heat exchange between the refrigerant and circulation water, includes calculating the maximum allowable frequency of a compressor based on the temperature of the outdoor air and the heating load of the heated space, calculating the mean operating frequency of the compressor while the compressor is operated at the calculated maximum allowable frequency, recalculating the maximum allowable frequency based on a result of comparison between the mean operating frequency and the maximum allowable frequency, and operating the compressor at the recalculated maximum allowable frequency, thereby improving coefficient of performance (COP) of the heat pump. 1. A control method of a heat pump which heats a heated space through heat exchange between outdoor air and a refrigerant and heat exchange between the refrigerant and circulation water , the control method comprising:calculating a maximum allowable frequency of a compressor based on a temperature of the outdoor air and a heating load of the heated space;calculating a mean operating frequency of the compressor while the compressor is operating at the calculated maximum allowable frequency;recalculating the maximum allowable frequency based on a result of comparison between the mean operating frequency and the maximum allowable frequency; andoperating the compressor at the recalculated maximum allowable frequency.2. The control method according to claim 1 , further comprising recalculating the heating load of the heated space based on the recalculated maximum allowable frequency.3. The control method according to claim 2 , wherein the recalculating of the maximum allowable frequency includes adding the calculated maximum allowable frequency and a predetermined frequency when the mean operating frequency is smaller than a product of the calculated maximum ...

VFD CONTROL FOR MULTIPLE CIRCUIT REFRIGERATION SYSTEM

A refrigeration system includes a first refrigerant circuit having a first compressor, and a second refrigerant circuit having a second compressor, the second refrigerant circuit separate from the first refrigeration circuit. A variable frequency drive (VFD) is in signal communication with the first compressor and the second compressor and is configured to enable a variable speed operation of the first and second compressors. A controller is in signal communication with the VFD. The controller is programmed to selectively switch the first and second compressors between a variable speed operation using the VFD and a fixed speed operation such that in a first mode the first compressor is operated in the fixed speed operation and the second compressor is operated in the variable speed operation, and in a second mode the second compressor is operated in the fixed speed operation and the first compressor is operated in the variable speed operation. 1. A refrigeration system comprising:a first refrigerant circuit having a first compressor;a second refrigerant circuit having a second compressor, the second refrigerant circuit separate from the first refrigeration circuit;a variable frequency drive (VFD) in signal communication with the first compressor and the second compressor, the VFD configured to enable a variable speed operation of the first and second compressors; anda controller in signal communication with the VFD, the controller programmed to selectively switch the first and second compressors between a variable speed operation using the VFD and a fixed speed operation such that in a first mode the first compressor is operated in the fixed speed operation and the second compressor is operated in the variable speed operation, and in a second mode the second compressor is operated in the fixed speed operation and the first compressor is operated in the variable speed operation.2. The refrigeration system of claim 1 , wherein the refrigeration system only comprises a ...

Electromechanical actuators for refrigerant flow control

An actuator assembly includes a first actuator, a second actuator, and a moving piece that is disposed between the first actuator and the second actuator. The moving piece is positionable to close a gap in the compressor.

VAPOR CYCLE COOLING SYSTEM FOR HIGH POWERED DEVICES

A vapor-compression system includes a centrifugal compressor configured to increase a pressure of a refrigerant based on at least one of an activation of a device or the device being equal to or above a first threshold temperature. A fluid communication system is configured to provide, to the device, a portion of the refrigerant in a liquid state. The portion of the liquid refrigerant in a liquid state is configured to have a saturation temperature equal to or below the first temperature threshold. 1. A vapor-compression system comprising:a centrifugal compressor configured to increase a pressure of a refrigerant based on at least one of an activation of a device or the device being equal to or above a first threshold temperature; anda fluid communication system configured to provide, to the device, a portion of the refrigerant in a liquid state, wherein the portion of the liquid refrigerant in a liquid state is configured to have a saturation temperature equal to or below the first temperature threshold.2. The vapor-compression system of claim 1 , wherein the centrifugal compressor is further configured to shut off based on at least one of the device being deactivated or the device being equal to or below a second threshold temperature.3. The vapor-compression system of claim 1 , wherein the device comprises a directed energy device.4. The vapor-compression system of claim 1 , wherein the device is configured to output an amount of heat that is greater than a cooling capacity of the vapor-compression system when activated claim 1 ,wherein the device is configured to output an amount of heat that is less than the cooling capacity of the vapor-compression system when deactivated.5. The vapor-compression system of claim 4 , wherein the capacity of the vapor-compression system is equal to or less than 15 kilowatts.6. The vapor-compression system of claim 2 , wherein the fluid communication system is further configured to provide liquid refrigerant below the second ...

CONDENSER, AND CENTRIFUGAL CHILLER EQUIPPED WITH THE SAME

The present invention makes it possible in a centrifugal chiller utilizing a low pressure refrigerant used at a maximum pressure of less than 0.2 MPaG to effectively extract, in high concentration, non-condensible gas that has mixed into the low pressure refrigerant, and thus suppresses reductions in condensing efficiency. This condenser () is equipped with: a shell vessel () into which a low pressure refrigerant used at a maximum pressure of less than 0.2 MPaG is introduced; a refrigerant inlet () which is provided to the top portion of the shell vessel (); a refrigerant outlet () which is provided to the bottom portion of the shell vessel (); a heat transfer tube bundle () in which a plurality of heat transfer tubes () circulating a chilled liquid in the interior thereof are bundled, and which extends along the interior of the shell vessel (); a gas extraction tube () in the heat transfer tube bundle interior, the gas extraction tube being disposed in the center region in the radial direction of the heat transfer tube bundle (), forming a tubular shape arranged parallel to the axial direction of the heat transfer tube bundle (), and having formed in the bottom surface thereof non-condensible gas extraction holes () for extracting non-condensible gas that has mixed into the low pressure refrigerant; and a gas extraction device () which is connected to the gas extraction tube () in the heat transfer tube bundle interior and extracts the non-condensible gas. 1. A condenser comprising:a shell container into which a low pressure refrigerant used at a maximum pressure of less than 0.2 MPaG is introduced;a refrigerant inlet which is provided in an upper portion of the shell container;a refrigerant outlet which is provided in a lower portion of the shell container;a heat transfer pipe bundle in which a number of heat transfer pipes causing a cooling liquid to circulate therein are bundled and which extends inside the shell container;an intra-heat transfer pipe bundle air ...

REFRIGERATING APPARATUS

A refrigeration apparatus including a compressor (), a condenser (), an expansion device (), and an evaporator (), fluidly connected to form a refrigeration cycle for a refrigerant, wherein the compressor () has a variable working capacity, and wherein the expansion device () has a configurable flow resistance with respect to the refrigerant passing through the expansion device. The apparatus further includes a controller () which is configured to determine a current working capacity of the compressor () and to control the resistance of the expansion device () in dependence on the current working capacity of the compressor (). The controller () is further configured to control the resistance of the expansion device () in order to achieve a mass flow of the refrigerant through the expansion device (), which mass flow corresponds to a mass flow of the refrigerant through the compressor (). 1. A refrigeration apparatus , comprising:{'b': 301', '302', '304', '305', '301', '304, 'a compressor (), a condenser (), an expansion device (), and an evaporator (), fluidly connected to form a refrigeration cycle for a refrigerant, the compressor () has a variable working capacity, and the expansion device () has a configurable resistance with respect to the refrigerant passing through the expansion device; and'}{'b': 300', '301', '304', '301, 'a controller () configured to determine a current working capacity of the compressor () and to control the resistance of the expansion device () in dependence on the working capacity of the compressor ().'}2300304304301. The apparatus of claim 1 , wherein the controller () is configured to control the resistance of the expansion device () in order to achieve a mass flow of the refrigerant through the expansion device () corresponding to a mass flow of the refrigerant through the compressor ().3300. The apparatus of claim 2 , wherein the controller () is configured to achieve said mass flow for a predetermined evaporating temperature of the ...

METHOD FOR CONTROLLING REFRIGERATOR

A method for controlling an operation of a refrigerator includes circulating and/or supplying a refrigerant to a refrigeration chamber evaporator and a freezer chamber evaporator, determining whether to stop an operation of the compressor a predetermined time from or after an initial driving point in circulating and/or supplying the refrigerant; opening a refrigeration chamber switching valve, a freezer chamber switching valve and/or a refrigerant flow path valve, and subsequently closing the valve(s) when it is determined that the compressor should be stopped; and stopping the compressor after opening the refrigeration chamber switching valve, the freezer chamber switching valve and/or the refrigerant flow path valve. 1. A method for controlling an operation of a refrigerator comprising a compressor , a condenser , and a refrigerant flow path valve that supplies refrigerant from the condenser to a refrigeration chamber evaporator and a freezer chamber evaporator , the method comprising:circulating and/or supplying the refrigerant to the refrigeration chamber evaporator and the freezer chamber evaporator;determining whether to stop an operation of the compressor a predetermined time from or after an initial driving point in circulating and/or supplying the refrigerant;opening the refrigerant flow path valve and subsequently closing the refrigerant flow path valve when it is determined that the compressor should be stopped; andstopping the compressor after opening the refrigerant flow path valve.2. The method of claim 1 , wherein the refrigerant flow path valve comprises a refrigeration chamber switching valve and a freezer chamber switching valve claim 1 , opening the refrigerant flow path valve comprises opening the refrigeration chamber switching valve and the freezer chamber switching valve claim 1 , and closing the refrigerant flow path valve comprises closing the refrigeration chamber switching valve and the freezer chamber switching valve.3. The method of ...

Compressor Bearing Cooling

A vapor compression system () comprises a compressor () having one or more bearing systems () supporting a rotor and/or one or more working elements (). One or more bearing feed passages () are coupled to the bearings to pass fluid along a supply flowpath to the bearings. A mechanical pump () is positioned to drive fluid along the supply flowpath. An ejector () has a motive flow inlet () coupled to the mechanical pump to receive refrigerant from the mechanical pump. 120220320. A vapor compression system (; ; ) comprising:{'b': '22', 'claim-text': [{'b': 40', '24', '26', '60, 'a housing assembly () having a suction port () and a discharge port () and a motor compartment ();'}, {'b': 42', '62', '64', '500, 'an electric motor () having a stator () within the motor compartment and a rotor () within the stator, the rotor being mounted for rotation about a rotor axis ();'}, {'b': '44', 'one or more working elements () coupled to the rotor to be driven by the rotor in at least a first condition so as to draw fluid in through the suction port and discharge said fluid out from the discharge port;'}, {'b': 66', '68, 'one or more bearing systems (, ) supporting the rotor and/or the one or more working elements, and'}, {'b': 114', '100, 'one or more bearing feed passages () coupled to the bearings to pass fluid along a supply flowpath () to the bearings;'}], 'a compressor () comprising{'b': 130', '330, 'a mechanical pump (; ) positioned to drive fluid along the supply flowpath to the one or more bearings;'}{'b': '28', 'a first heat exchanger () downstream of the discharge port along a refrigerant primary flowpath in a first operational mode;'}{'b': '32', 'an expansion device () downstream of the first heat exchanger along the primary flowpath in the first operational mode; and'}{'b': '30', 'a second heat exchanger () downstream of the expansion device and coupled to the suction port to return refrigerant in the first operational mode, the system further comprising{'b': 140', ' ...

COMPOSITION FOR HEAT CYCLE SYSTEM AND HEAT CYCLE SYSTEM

There are provided a composition for a heat cycle system containing a working medium for heat cycle that has a low global warming potential and high stability, which can be used as a substitute for HFC-134a and HFC-245fa, and a heat cycle system using this composition. The composition for a heat cycle system contains: a working medium for heat cycle containing 1-chloro-2,3,3,3-tetrafluoropropene; and a stabilizer suppressing deterioration of the working medium for heat cycle such as an oxidation resistance improver, a heat resistance improver, or a metal deactivator, and the heat cycle system uses this composition for a heat cycle system. 1. A composition for a heat cycle system comprising:a working medium for heat cycle containing 1-chloro-2,3,3,3-tetrafluoropropene; anda stabilizer suppressing deterioration of the working medium for heat cycle.2. The composition for a heat cycle system according to claim 1 ,wherein the 1-chloro-2,3,3,3-tetrafluoropropene contains (Z)-1-chloro-2,3,3,3-tetrafluoropropene and (E)-1-chloro-2,3,3,3-tetrafluoropropene at a ratio of 51:49 to 100:0 by mass ratio represented by (Z)-1-chloro-2,3,3,3-tetrafluoropropene:(E)-1-chloro-2,3,3,3-tetrafluoropropene.3. The composition for a heat cycle system according to claim 1 ,wherein the stabilizer is at least one type of stabilizer selected from the group consisting of an oxidation resistance improver, a heat resistance improver, and a metal deactivator.4. The composition for a heat cycle system according to claim 3 ,wherein the stabilizer is at least one type of compound selected from the group consisting of a phenol compound, an unsaturated hydrocarbon group-containing aromatic compound, an aromatic amine compound, an aromatic thiazine compound, a terpene compound, a quinone compound, a nitro compound, an epoxy compound, a lactone compound, an orthoester compound, a mono- or di-alkali metal salt compound of phthalic acid, and a thiodiphenyl ether hydroxide compound.5. The composition for a ...

CONTROL METHOD FOR MODULAR REFRIGERATED MERCHANDISER

A method of controlling a refrigerated merchandiser including a plurality of display case modules each having a separate refrigeration circuit with a compressor and an evaporator. The method includes selectively starting and stopping a first compressor of a first refrigeration circuit having a first evaporator associated with a first display case module to regulate a temperature in a product display area of the first display case module, and selectively starting and stopping a second compressor of a second refrigeration circuit having a second evaporator associated with a second display case module to regulate a temperature in a product display area of the second display case module. The method also includes controlling the first refrigeration module and the second refrigeration module based on a heat load of the merchandiser and a predetermined number of start/stop cycles of each of the first compressor and the second compressor within a given time period. 1. A method of controlling a refrigerated merchandiser including a plurality of display case modules each having a separate refrigeration circuit with a compressor and an evaporator , the method comprising:selectively starting and stopping a first compressor of a first refrigeration circuit having a first evaporator associated with a first display case module to regulate a temperature in a product display area of the first display case module;selectively starting and stopping a second compressor of a second refrigeration circuit having a second evaporator associated with a second display case module to regulate a temperature in a product display area of a second display case module; andcontrolling the first refrigeration circuit and the second refrigeration circuit based on a heat load of the merchandiser and a predetermined number of start/stop cycles of each of the first compressor and the second compressor within a given time period.2. The method of claim 1 , further comprising controlling the first ...

ELECTRIC MOTOR SYSTEM, AND TURBO COMPRESSOR PROVIDED WITH SAME

An electric motor system includes a drive shaft that rotationally drives a load, a bearingless motor, a power source unit, and a control unit. The bearingless motor includes a rotor and a stator having armature and support windings. The bearingless motor rotationally drives the drive shaft and supports a radial load of the drive shaft in a contactless manner. The power source unit applies a voltage to the armature and support windings. The control unit controls the power source unit so that a radial support force that is a sum of a radial support force caused by a support current and a radial support force caused by both the support current and an armature current is output, and so that one of an armature voltage across the armature winding and the support current is increased and the other of the armature voltage and the support current is decreased. 1. An electric motor system comprising:a drive shaft that rotationally drives a load;a bearingless motor including a rotor and a stator having an armature winding and a support winding, the bearingless motor rotationally driving the drive shaft and supporting a radial load of the drive shaft in a contactless manner;a power source unit configured to apply a voltage to the armature winding and the support winding; and so that a radial support force that is a sum of a radial support force caused by a support current flowing through the support winding and a radial support force caused by both the support current and an armature current flowing through the armature winding is output, and', 'so that one of an armature voltage across the armature winding and the support current is increased and the other of the armature voltage and the support current is decreased., 'a control unit configured to control the power source unit'}2. The electric motor system according to claim 1 , wherein so that the armature voltage is increased and the support current is decreased or', 'so that the support current is increased and the armature ...

Refrigeration system mixed-flow compressor

A compressor includes a housing, a first compression stage defined within the housing, a second compression stage defined within the housing, and a motor disposed between the first compression stage and the second compression stage relative to a flow of fluid through the compressor. The first compression component of the first compression stage has a mixed-flow configuration and the second compression component of the second compression stage has a radial-flow configuration.

METHOD FOR OPTIMIZING THE ENERGETIC CONSUMPTION OF A REFRIGERATING MACHINE AND REFRIGERATING MACHINE IMPLEMENTING SAID METHOD

Method for optimizing the energy consumption of a refrigeration unit, comprising: a step A: activating a driving device () of the compressor () by modulating the operating voltage Vout of the compressor () to an optimized value designed to activate the compressor () at an optimized speed determined by a thermodynamic optimization algorithm; a step B: regulating the driving device () which drives the AC/DC converter () so that the bus voltage is equal to the greater between a first threshold and a second threshold; wherein the first threshold is equal to the product of √2 by the value of the supply voltage and the second threshold is equal to the product of √2 by the value of the driving voltage; a step C: modifying the speed of each fan in order to minimize the value of an overall electrical consumption. 2. The method according to wherein said step C provides claim 1 , for each of said at least one auxiliary member claim 1 , cyclically repeat in sequence:a step C1 of detecting a first overall electrical consumption value Etot1;a step C2 of reducing the Faux speed of said at least one auxiliary member from a first value of Faux1 to a second value of Faux2,a step C3 of detecting a second overall electrical consumption Etot2 of said at least one auxiliary member;a step C4 of returning said operative value Faux to said first operative value Faux1 if said second total electric consumption Etot2 is not less than said first total electric consumption value Etot1.31018. The method according to wherein claim 2 , in said step C claim 2 , cycles of said steps from said step C1 to said step C4 are repeated with a time interval greater than a calculation time of a processor of said refrigeration machine () and preferably with a switching frequency of the inverter claim 2 , and preferably not greater than 8 kHz.4. The method according to wherein said step B cyclically comprises:a step B1 providing detect or calculate said voltage of power supply Vac, said bus voltage Vdc and said ...

METHOD FOR TRANSITIONING BETWEEN VEHICLE CLIMATE CONTROL SYSTEM MODES

A method for controlling transitions between activating and deactivating a vehicle air conditioner compressor is disclosed. In one example, displacement of the air conditioner compressor is adjusted before the air conditioner is coupled to an energy conversion device. The method may provide smooth transitions between different air conditioner compressor control modes. 1. A method for controlling an air conditioner compressor of a vehicle , comprising:reducing a refrigerant pressurization capacity and negative torque to turn force of the air conditioner compressor before engaging the air conditioner compressor to an energy conversion device that supplies rotational energy to the air conditioner compressor;engaging a clutch to mechanically couple the air conditioner compressor to the energy conversion device; andincreasing the refrigerant pressurization capacity and negative torque to turn force of the air conditioner compressor a predetermined amount of time after engaging said clutch, including adjusting an air conditioner displacement command in response to starting or stopping of the air conditioner compressor.2. The method of claim 1 , where increasing the refrigerant pressurization capacity and negative torque to turn force includes gradually increasing the air conditioner displacement command.3. The method of claim 2 , where the gradual increasing includes ramping up the air conditioner displacement command claim 2 , including adjusting a ramp rate of the air conditioner displacement command depending on operating conditions of the energy conversion device to provide soft start and stop.4. The method of claim 3 , where the energy conversion device is an engine and where the ramp rate of the air conditioner displacement command is increased when a speed of the engine is greater than an idle speed.5. The method of claim 2 , where the gradual increasing includes ramping up the air conditioner displacement command claim 2 , including adjusting a ramp rate of the ...

CONSTANT TEMPERATURE LIQUID CIRCULATION APPARATUS AND TEMPERATURE ADJUSTMENT METHOD FOR CONSTANT TEMPERATURE LIQUID

To enable temperature adjustment of constant temperature liquid and pressure equalizing operations to be performed with a simple circuit configuration using one electronic expansion valve. On/off of a compressor of a refrigeration circuit is controlled in accordance with the temperature of a constant temperature liquid, and when the compressor is on an electronic expansion valve is controlled so as to change the opening angle thereof in a restricted opened state smaller than when full-open, thereby adjusting the flow rate of coolant and adjusting the temperature of the constant temperature liquid, while when the compressor is turned off the opening angle of the electronic expansion valve is set to a pressure equalizing angle which is greater than the opening angle when in the controlled opened state, and the pressure equalizing angle is maintained a certain amount of time, thereby doing away with pressure difference between a high pressure portion and low pressure portion within the refrigeration circuit, thus doing away with overload when turning the compressor on. 1. A constant temperature liquid circulation apparatus comprising: a constant temperature liquid circuit which circularly supplies a constant temperature liquid which temperature has been adjusted to a load; a refrigeration circuit which adjusts the temperature of the constant temperature liquid by thermal exchange with a coolant to a set temperature; and a control unit which controls the overall device ,wherein the constant temperature liquid circuit includes a tank which accommodates the constant temperature liquid, a pump which supplies the constant temperature liquid within the tank to the load, and a temperature sensor which measures the temperature of the constant temperature liquid supplied to the load,wherein the refrigeration circuit is configured by a compressor which compresses the coolant in a gaseous state into a high-temperature high-pressure gaseous coolant, a condenser which cools the ...

REFRIGERATION APPARATUS AND REFRIGERATION CYCLE APPARATUS

A refrigeration apparatus includes a compressor receiving refrigerant through an injection pipe and of discharging the refrigerant, a condenser, an electronic expansion valve connected by piping to another end of the injection pipe, a subcooling coil, a solenoid valve configured to control inflowing of the refrigerant through the injection pipe into the compressor, an injection bypass pipe connecting the injection pipe and a pipe on a suction side of the compressor, a solenoid valve configured to control passage of the refrigerant flowing through the injection bypass pipe, a high-low pressure bypass pipe connecting a pipe on a discharge side of the compressor and the pipe on the suction side of the compressor, a solenoid valve configured to control passage of the refrigerant through the high-low pressure bypass pipe, and a controller configured to control a frequency of the compressor and opening and closing of each of the solenoid valves. 1. A refrigeration apparatus comprising:a compressor connected to an end of an injection pipe and capable of receiving a flow of refrigerant through the injection pipe in an intermediate section in a compression stroke and of discharging the refrigerant;a heat source side heat exchanger configured to exchange heat between outside air and the refrigerant;an expansion device connected by piping to another end of the injection pipe and configured to reduce a pressure of a portion of the refrigerant flowing from the heat source side heat exchanger;a supercooling device configured to supercool the refrigerant flowing from the heat source side heat exchanger by using the refrigerant having passed through the expansion device;a first flow opening and closing device configured to control inflowing of the refrigerant through the injection pipe into the compressor;an injection bypass pipe connecting the injection pipe and a pipe on a suction side of the compressor;a second flow opening and closing device configured to control passage of the ...

HYBRID TANDEM COMPRESSOR SYSTEM AND METHOD OF USE

A compressor system includes a variable-speed compressor and a fixed-speed compressor. A control unit is operatively coupled to the variable-speed compressor and is operatively coupled to the fixed-speed compressor. A sensor is operatively coupled to the control unit and disposed in an enclosed space. The sensor measures at least one of a temperature and a relative humidity of the enclosed space and determines an HVAC load of the enclosed space. Responsive to a determination of the HVAC load, the control unit directs operation of the variable-speed compressor and the fixed-speed compressor. 1. A compressor system comprising:a variable-speed compressor;a fixed-speed compressor;a control unit operatively coupled to the variable-speed compressor and operatively coupled to the fixed-speed compressor;a sensor operatively coupled to the control unit and disposed in an enclosed space, the sensor measuring at least one of a temperature and a relative humidity of the enclosed space and determining an HVAC load of the enclosed space; andwherein, responsive to a determination of the HVAC load, the control operation of the variable-speed compressor and the fixed-speed compressor.2. The compressor system of claim 1 , wherein the control unit modulates a speed of the variable-speed compressor to a value between a rated minimum speed and a rated maximum speed of the variable speed compressor.3. The compressor system of claim 1 , wherein the control unit cycles the fixed-speed compressor between an operational state and a deactivated state. The compressor system of claim 1 , wherein the HVAC load is a cooling load.5. The compressor system of claim 1 , wherein the HVAC load is a heating load.6. The compressor system of claim 1 , wherein the sensor and the control unit are integral.7. A method of controlling an HVAC system claim 1 , the method comprising:measuring, using a sensor, environmental conditions of an enclosed space;responsive to the measuring, determining, using a control ...

AXIAL FLOW COMPRESSOR FOR HVAC CHILLER SYSTEMS

One exemplary embodiment of this disclosure relates to a refrigerant compressor for use in a chiller system. The compressor includes an electric motor arranged upstream of a stage of a compressor in the main refrigerant flow path. This disclosure also relates to an axial flow compressor of a relatively high capacity, and a recirculation feature for the same. 1. A compressor , comprising:a compression stage arranged in a main refrigerant flow path; andan electric motor arranged upstream of the compression stage and in the main refrigerant flow path.2. The compressor as recited in claim 1 , wherein the compressor includes a housing.3. The compressor as recited in claim 2 , wherein the housing defines the main refrigerant flow path claim 2 , and wherein the compression stage and the electric motor are provided in the housing.4. The compressor as recited in claim 1 , wherein the compressor is an axial flow compressor such that fluid flowing within the main refrigerant flow path principally flows in a direction parallel to an axis of rotation of the electric motor.5. The compressor as recited in claim 4 , wherein the compressor provides a refrigeration capacity of at least 60 tons.6. An axial flow refrigerant compressor claim 4 , comprising:an inlet;an outlet; andat least one compression stage having a plurality of blades configured to rotate about an axis of rotation, wherein refrigerant flowing from the inlet to the outlet principally flows in a direction parallel to the axis of rotation;wherein the refrigerant compressor provides a refrigeration capacity of at least 60 tons.7. The axial flow refrigerant compressor as recited in claim 6 , further comprising a recirculation flow path.8. The axial flow refrigerant compressor as recited in claim 6 , wherein the plurality of blades rotate on a shaft.9. The axial flow refrigerant compressor as recited in claim 8 , wherein the shaft is supported by at least one magnetic bearing.10. The axial flow refrigerant compressor as ...

SUPERHEAT AND SUB-COOLING CONTROL OF REFRIGERATION SYSTEM

A refrigeration vapor compression system including a compressor, an electronic expansion valve with closed loop feedback into a controller, sensors to measure and monitor the system superheat and sub-cooling, and condenser fans controlling the flow of air through the condensing coils, the refrigeration system is operated in at least one of two functional modes to either give priority control to the level of superheat in the system or maintain a minimum level of sub-cooling in the system. 1. A refrigerant vapor compression system comprising:a compressor;first and second heat exchangers fluidly coupled to the compressor;a variable orifice expansion valve located between the first and second heat exchangers;at least one sensor for sensing operating conditions of the system related to a system superheat level and a system subcooling level; monitor the system superheat level to determine whether the system superheat level is within a prescribed range of a system superheat setpoint;', 'monitor the system subcooling level to determine whether the system subcooling level is within a prescribed range of a system subcooling setpoint; and,', adjust at least one system setting to restore the system subcooling level to within the prescribed range of the system subcooling setpoint while the system superheat level is within its prescribed range;', 'increment the system superheat setpoint when either the system subcooling level or the system superheat level cannot be maintained within their respective prescribed ranges; and', 'adjust at least one system setting to achieve the incremented superheat setpoint., 'iteratively], 'a controller operative to receive sensed data from the at least one sensor and, based at least in part thereon, control at least one system component to optimize system performance, the controller configured to2. The system of claim 1 , wherein the at least one sensor for sensing operating conditions of the system related to a system superheat level and a system ...

AIR-CONDITIONING APPARATUS

An air-conditioning apparatus includes a compressor, an indoor heat exchanger configured to function as a condenser or an evaporator, indoor heat exchanges each configured to function as a condenser or an evaporator, a plurality of expansion valves each provided for a corresponding one of the indoor heat exchangers each configured to adjust a flow rate of a refrigerant that flows through the corresponding indoor heat exchanger and a controller configured to control an operation capacity of the compressor and opening degrees of a plurality of expansion devices. When increasing heat exchange performance of the indoor heat exchanger, the controller increases the operation capacity of the compressor and controls the opening degree of the expansion valve corresponding to the indoor heat exchanger to decrease the flow rate of the refrigerant that flows through the indoor heat exchanger. 1. An air-conditioning apparatus comprising: a compressor; a heat source side heat exchanger configured to function as a condenser or an evaporator; a plurality of use side heat exchangers each configured to function as a condenser or an evaporator; a plurality of expansion devices each provided for a corresponding one of the use side heat exchangers , and each configured to adjust a flow rate of a refrigerant that flows through the corresponding use side heat exchanger; and a controller configured to control an operation capacity of the compressor and opening degrees of the plurality of expansion devices , whereinwhen increasing heat exchange performance of a first use side heat exchanger that is at least one, but not all, of the plurality of use side heat exchangers,the controllerincreases the operation capacity of the compressor, andcontrols the opening degree of the expansion device corresponding to a second use side heat exchanger that is at least one of the use side heat exchangers that perform a function identical to a function of the first use side heat exchanger, to decrease a ...

TURBO COMPRESSOR AND TURBO CHILLER USING SAME

The purpose of the present invention is to provide: a turbo compressor which is provided with an open impeller and has the minimal gap between the shroud and the impeller such that efficiency is improved and the safe operating region is enlarged; and a turbo chiller using the same. The turbo compressor is provided with an open impeller with a shroud provided on the side of a casing, and the rotary shaft is supported by a radial magnetic bearing and a magnetic thrust bearing. The turbo compressor is provided with a control unit that comprises: a load calculating means that calculates the axial thrust load generated by the pressure distribution of the compressor; and an axial support position control means that controls a gap between the impeller and the shroud to be a target gap by varying, on the basis of the axial thrust load, the axial support position of the rotary shaft due to the magnetic thrust bearing. 17-. (canceled)8. A turbo compressor comprising:an open impeller with a shroud provided on a casing side;a rotary shaft which is supported by a radial magnetic bearing and a thrust magnetic bearing; and load calculating means for calculating an axial direction thrust load generated by a pressure distribution of the compressor, and', {'b': 1', '2', '1, 'axial direction support position controlling means for controlling a gap between the impeller and the shroud to at least two different target gaps including a minimum gap S and a gap S which is greater than the gap S by changing an axial direction support position of the rotary shaft determined by the thrust magnetic bearing on the basis of the axial direction thrust load.'}], 'a controller which includes'}9. The turbo compressor according to claim 8 ,{'b': 1', '2', '1, 'wherein the axial direction support position controlling means has a function of, when an operation condition in which the axial direction thrust load is rapidly changed is detected, correcting and controlling the axial direction support position ...

THERMOSTATIC EXPANSION VALVES AND METHODS OF CONTROL

A method of operating a refrigeration system is provided. The method includes activating an evaporator heater (), monitoring a pressure differential within the refrigeration system (), when the pressure differential reaches a predetermined value (), deactivating the evaporator heater (), and activating one or more evaporator fans (), after deactivating the evaporator heater, to cause a thermostatic expansion valve to open. 1. A method of operating a refrigeration system comprising:activating an evaporator heater;monitoring a pressure differential within the refrigeration system;when the pressure differential reaches a predetermined value, deactivating the evaporator heater; andactivating one or more evaporator fans, after deactivating the evaporator heater, to cause a thermostatic expansion valve to open.2. The method of claim 1 , wherein the pressure differential is monitored between an input side and an output side of an evaporator.3. The method of claim 1 , wherein the predetermined value is 50 psi.4. The method of claim 1 , further comprising determining that the refrigeration system failed to start prior to activating the evaporator heater.5. The method of claim 4 , wherein determining that the refrigeration system failed to start is based on a detected current draw of a compressor.6. The method of claim 1 , further comprising starting a compressor of the refrigeration system after the thermostatic expansion valve is open.7. The method of claim 6 , further comprising claim 6 , after starting the compressor claim 6 , starting a condenser and then starting an evaporator.8. The method of claim 1 , further comprising activating one or more condenser fans after activating the evaporator heater.9. The method of claim 8 , further comprising claim 8 , when the pressure differential reaches the predetermined value claim 8 , deactivating the one or more condenser fans.10. A refrigeration system comprising:a compressor;a condenser having one or more condenser fans;an ...

COMPRESSOR AND THE COMPRESSOR CONTROLLING METHOD

The present invention provides a compressor that includes: one or more impellers that axially suck and centrifugally compress a refrigerant; a rotary shaft that is connected with the impeller and a motor for rotating the impeller; a plurality of magnetic bearings that supports the rotary shaft in the air so that the rotary shaft can rotate; a gap sensor that senses the distance from the rotary shaft; and a controller that determines abnormal wire connection of the magnetic bearings on the basis of information from the gap sensor. The controller can sense movement of the rotary shaft through the gap sensor while controlling the amount of current supplied to any one of the magnetic bearings and can determine whether there is abnormal wire connection on the basis of the information. 1. A compressor comprising:one or more impellers that axially suck and centrifugally compress a refrigerant;a rotary shaft that is connected with the impeller and a motor for rotating the impeller;a plurality of magnetic bearings that supports the rotary shaft in the air so that the rotary shaft can rotate;a gap sensor that senses the distance from the rotary shaft; anda controller that determines abnormal wire connection of the magnetic bearings on the basis of information from the gap sensor,wherein the controller senses movement of the rotary shaft through the gap sensor while controlling the amount of current supplied to any one of the magnetic bearings and determines whether there is abnormal wire connection on the basis of the information.2. The compressor of claim 1 , wherein when determining that there is abnormal wire connection in a magnetic bearing claim 1 , the controller supplies a current to two adjacent magnetic bearings of the magnetic bearings.3. The compressor of claim 2 , wherein the controller reduces step by step the current applied to any one of the two adjacent magnetic bearings claim 2 , and senses the position of the rotary shaft using the gap sensor every time the ...

AIR CONDITIONER

An air conditioner includes a main refrigerant circuit where refrigerant flows in order of a compressor, outdoor heat exchanger, expansion valve, and indoor heat exchanger. An injection circuit is configured such that the refrigerant diverges between the outdoor heat exchanger and indoor heat exchanger in the main refrigerant circuit and returns to the compressor having a pressure between a suction pressure of compressor and a discharge pressure of compressor. The injection circuit includes an injection decompression valve reducing a pressure of the refrigerant, a control unit cooling portion cooling a control unit to control the compressor using the refrigerant, and a sub-cooler evaporation portion provided at a downstream side of the injection decompression valve such that heat exchange of the refrigerant is performed in the sub-cooler evaporation portion, and the control unit cooling portion is provided between the injection decompression valve and the sub-cooler evaporation portion in the injection circuit. 1. An air conditioner comprising:a main refrigerant circuit configured such that a refrigerant flows in order of a compressor, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger; andan injection circuit configured such that the refrigerant diverges between the outdoor heat exchanger and indoor heat exchanger in the main refrigerant circuit and returns to the compressor in a state of having a pressure between a suction pressure of compressor and a discharge pressure of compressor, an injection decompression valve reducing a pressure of the refrigerant;', 'a control unit cooling portion cooling a control unit to control the compressor using the refrigerant; and', 'a sub-cooler evaporation portion located at a downstream side of the injection decompression valve and performed heat exchange of the refrigerant, and', 'wherein the control unit cooling portion is provided between the injection decompression valve and the sub-cooler ...

REFRIGERATED DRYER POWER SAVING CONTROLS

According to one aspect of the present disclosure, a control system and method of controlling a refrigerated dryer of a gas compressor system are disclosed. The control system, including a controller and a flow sensor, selectively operates in a power saving mode in which the controller shuts down a refrigerant compressor included in the dryer system when the flow sensor indicates that no compressed gas is flowing through the dryer. In a further aspect of the present disclosure, the control system uses input from a temperature sensor to determine whether to activate the compressor regardless of the flow of compressed gas through the dryer. Consequently, the control system enables the dryer to perform with aspects of both non-cyclic and cyclic dryers without the added cost and complexity of a conventional cyclic dryer. 1. A method comprising:operating a refrigerated compressed air dryer, the refrigerated compressed air dryer comprising: a refrigeration circuit including a compressor, a condenser and an evaporator, a compressed air circuit in thermal communication with the evaporator, the evaporator structured to cool compressed air flowing through the compressed air circuit;monitoring a flow condition of the compressed air in the compressed air circuit and a temperature condition of the evaporator with an electronic controller;deactivating the compressor with the electronic controller if the flow condition indicates no flow of compressed air and a temperature condition of the evaporator reaches a lower threshold; andreactivating the compressor with the electronic controller if the flow condition indicates flow of compressed air and/or the temperature condition of the evaporator reaches an upper threshold.2. The method of claim 1 , wherein the acts of deactivating and activating are repeated a plurality of times to minimize power consumption by the compressor while simultaneously maintaining the temperature condition of the evaporator below the upper threshold.3. The ...

REFRIGERATING CYCLE APPARATUS AND METHOD FOR OPERATING THE SAME

A refrigerating cycle apparatus and a method of operating the same are provided. For a refrigerating cycle having a plurality of compressors connected in series for multi-stage compression, an inner space of each compressor and a pipe of the refrigerating cycle may be connected via an oil collection pipe, and oil may be discharged into the refrigerating cycle by pressure reversal during a pressure balancing operation, so as to allow the discharged oil to be collected into a high-stage compressor or a low-stage compressor. Accordingly, an amount of oil may be uniformly maintained in each of the plurality of compressors to prevent losses due to friction and/or increases in power consumption due to a lack of oil in one or more of the compressors. The structure of a device and pipes for performing oil balancing between the compressors may be simplified to enhance efficiency of the compressors. 1. A method for operating a refrigerating cycle apparatus having a low-stage compressor and a high-stage compressor connected to each other in series , and a refrigerant switching valve connected to a discharge side of the high-stage compressor and having a low-stage side outlet connected to a low-stage side evaporator and a high-stage side outlet connected to a high-stage side evaporator , with the low-stage side evaporator connected to a suction side of the low-stage compressor and the high-stage side evaporator connected to a suction side of the high-stage compressor , the method comprising:determining that oil balancing is required between the low-stage compressor and the high-stage compressor; andperforming an oil balancing operation and transferring oil from one of the low-stage or the high-stage compressor to the other of the low-stage or the high-stage compressor, the one of the low-stage or the high-stage compressor containing more oil than the other of the low-stage or the high-stage compressor, wherein the performing of the oil balancing operation comprises driving both ...

AIR CONDITIONER

Dehumidification cannot be performed when a load decreases. In an air conditioner of the present invention, an indoor heat exchanger includes an auxiliary heat exchanger and a main heat exchanger disposed leeward from the auxiliary heat exchanger . In an operation in a predetermined dehumidification operation mode, a liquid refrigerant supplied to the auxiliary heat exchanger all evaporates midway in the auxiliary heat exchanger . Therefore, only an upstream partial area in the auxiliary heat exchanger is an evaporation region, while an area downstream of the evaporation region in the auxiliary heat exchanger is a superheat region. In the predetermined dehumidification operation mode, a compressor and an expansion valve are controlled so that the extent of the evaporation region of the auxiliary heat exchanger varies depending on the load. 118-. (canceled)19. An air conditioner , comprisinga refrigerant circuit in which a compressor, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger are connected to one another, whereinin a predetermined dehumidification operation mode, the indoor heat exchanger includes: an evaporation region where a liquid refrigerant evaporates; and a superheat region downstream of the evaporation region, and the compressor and the expansion valve are controlled so that an extent of the evaporation region varies depending on a load.20. The air conditioner according to claim 19 , further comprising an evaporation temperature detecting unit configured to detect an evaporation temperature claim 19 , whereinthe compressor and the expansion valve are controlled based on the evaporation temperature.21. The air conditioner according to claim 20 , whereinthe compressor and the expansion valve are controlled so that the evaporation temperature falls within a predetermined temperature range.22. The air conditioner according to claim 19 , further comprising a superheat temperature detecting unit configured to detect a superheat ...

EVAPORATOR AND CENTRIFUGAL CHILLER PROVIDED WITH THE SAME

The present invention maintains a compact evaporator size in a centrifugal chiller utilizing a low pressure refrigerant used at a maximum pressure of less than 0.2 MPaG while avoiding efficiency losses and equipment damage that result from carryover of liquid state refrigerant to the turbo compressor side. This evaporator is equipped with a pressure vessel into which a condensed refrigerant is introduced, a refrigerant inlet which is provided to the bottom portion of the pressure vessel, a refrigerant outlet which is provided to the top portion of the pressure vessel, a heat transfer pipe group which passes through the interior of the pressure vessel, circulates liquid to be chilled through the interior thereof, and exchanges heat between the liquid to be chilled and the refrigerant, and a demister which is disposed between the refrigerant outlet and the heat transfer pipe group in the interior of the pressure vessel and carries out vapor-liquid separation of the refrigerant, a dividing section (for example, a plurality of notches) being provided between the periphery of the demister and the inner peripheral surface of the pressure vessel. The dividing section is provided to a side of the demister along the lengthwise direction. 1. An evaporator comprising:a pressure container into which a condensed refrigerant is introduced;a refrigerant inlet which is provided in a lower portion of the pressure container;a refrigerant outlet which is provided in an upper portion of the pressure container,a group of heat transfer pipes which passes through an inside of the pressure container and circulates a cooling target liquid inside the group of heat transfer pipes to cause the cooling target liquid to be subjected to heat exchange with the refrigerant; anda demister which is installed between the refrigerant outlet and the group of heat transfer pipes inside the pressure container and performs gas-liquid separation of the refrigerant,wherein a separation portion is provided ...

Helium Management Control System

A refrigerant management system controls the supply of refrigerant from two or more variable speed and fixed speed compressors to a plurality of cryogenic refrigerators. The system employs a plurality of sensors to monitor and regulate the overall refrigerant supply to deliver an appropriate refrigerant supply to each of the cryogenic refrigerators. The amount of refrigerant to supply is based on an aggregate demand for refrigerant from the plurality of cryogenic refrigerators and a refrigerant correction metric. An appropriate supply of refrigerant is distributed to each cryogenic refrigerator by adjusting the speed of the variable speed compressors or, alternatively, selectively turning the compressors on or off. The speed of the variable speed compressors is adjusted by determining an amount of refrigerant to supply to the plurality of cryogenic refrigerators. If the aggregate demand for refrigerant exceeds the capacity of the compressors, then the speed of a refrigerator within the plurality of refrigerators is adjusted. 1. In a cryogenic refrigeration system in which plural compressors , controlled by a controller , supply helium refrigerant at a supply pressure to plural cryogenic refrigerators , each comprising a reciprocating displacer , that expand the helium refrigerant to absorb heat to produce a cooling effect and that return the helium refrigerant to the compressors at a return pressure , a method for controlling supply of the helium refrigerant , the method comprising:at the controller, receiving communication from plural refrigerators indicating demand for helium refrigerant;determining an aggregated demand for the helium refrigerant for the plural cryogenic refrigerators;sensing supply pressure from the compressors;sensing return pressure to the compressors;at the controller, calculating a helium refrigerant supply correction based on a difference between sensed supply pressure and sensed return pressure;computing amount of helium refrigerant to ...

COMPOSITION FOR HEAT CYCLE SYSTEM AND HEAT CYCLE SYSTEM

A composition for a heat cycle system contains a working medium for heat cycle containing 1-chloro-2,3,3,3-tetrafluoropropene and a refrigerant oil. 1. A composition for a heat cycle system comprising:a working medium for heat cycle containing 1-chloro-2,3,3,3-tetrafluoropropene; anda refrigerant oil.2. The composition for a heat cycle system according to claim 1 ,wherein the 1-chloro-2,3,3,3-tetrafluoropropene contains (Z)-1-chloro-2,3,3,3-tetrafluoropropene and (E)-1-chloro-2,3,3,3-tetrafluoropropene at a ratio of 51:49 to 100:0 by mass ratio represented by (Z)-1-chloro-2,3,3,3-tetrafluoropropene:(E)-1-chloro-2,3,3,3-tetrafluoropropene.3. The composition for a heat cycle system according to claim 1 ,wherein the refrigerant oil contains at least one type of oil selected from the group consisting of an ester-based refrigerant oil, an ether-based refrigerant oil, a hydrocarbon-based refrigerant oil, and a naphthenic refrigerant oil.4. The composition for a heat cycle system according to claim 3 ,wherein the refrigerant oil contains at least one type of compound selected from the group consisting of a dibasic acid ester, a polyol ester, a complex ester, a polyol carbonic acid ester, polyvinyl ether, a polyalkylene glycol, alkyl benzene, and a naphthene-base oil.5. The composition for a heat cycle system according to claim 1 ,{'sup': 2', '2, 'wherein the refrigerant oil has a kinematic viscosity at 40° C. of 1 mm/s or more and 750 mm/s or less.'}6. The composition for a heat cycle system according to claim 1 ,wherein the refrigerant oil contains carbon atoms and oxygen atoms at a ratio of 2.0 or more and 7.5 or less by molar ratio represented by carbon atoms/oxygen atoms.7. The composition for a heat cycle system according to claim 1 ,wherein the working medium for heat cycle further contains saturated hydrofluorocarbon.8. The composition for a heat cycle system according to claim 1 ,wherein the working medium for heat cycle further contains hydrofluoroolefin.9. The ...

Refrigerant circulation device, refrigerant circulation method, refrigerant filling method, and method for operating refrigerant circulation device

An object of the present invention is to provide a refrigerant circulation device and method that can suppress acid generation caused by decomposition of a refrigerant containing an HFO or HCFO. The refrigerant circulation device has a compressor, a condenser, expansion valves and an evaporator connected by a main pipe to form a refrigerant circulation circuit through which a refrigerant is circulated, the refrigerant circulation circuit being filled with a refrigerant containing a hydrofluoroolefin or a hydrochlorofluoroolefin having a carbon-carbon double bond within the molecular structure, wherein the refrigerant circulation device includes a drive that drives the compressor via a speed increaser, and a drive cooling unit that cools the drive with the refrigerant condensed in the condenser, and a desiccant that can trap moisture is disposed in the evaporator or the drive cooling unit.

COMPRESSOR AND REFRIGERATION CYCLE APPARATUS

A compressor for use in a refrigerant circuit using a refrigerating machine oil being free of phosphoric ester and a refrigerant mixture inclusive of 1,1,2-trifluoroetylene includes a rolling piston and a vane in contact with the rolling piston in a slidable manner. The rolling piston and the vane are formed of a base metal, the base metal being steel, and the base metal is exposed at a contact portion between the rolling piston and the vane 1. A compressor for use in a refrigerant circuit using a refrigerating machine oil being free of phosphoric ester and a refrigerant mixture inclusive of 1 ,1 ,2-trifluoroetylene , the compressor comprising:a first member formed of a base metal, the base metal being steel, the first member including a first contact portion; anda second member including a second contact portion being in contact with the first contact portion of the first member in a slidable manner, whereinthe base metal of the first member is exposed at the first contact portion.2. The compressor of claim 1 , further comprising:a cylinder including a compression chamber;a rolling piston rotating in the compression chamber; anda vane separating the compression chamber into two spaces, the vane having an edge being in contact with an outer peripheral surface of the rolling piston,wherein at least one of the rolling piston and the vane is the first member.3. A refrigeration cycle apparatus comprising:{'claim-ref': {'@idref': 'CLM-00001', 'claim 1'}, 'a refrigerant circuit including the compressor of ;'}a refrigerant mixture inclusive of 1,1,2-trifluoroethylene and used in the refrigerant circuit; anda refrigerating machine oil being free of phosphoric ester and used in the refrigerant circuit.4. The refrigeration cycle apparatus of claim 3 , wherein no anti-wear agent is added to the refrigerating machine oil.5. The refrigeration cycle apparatus of claim 3 , wherein the refrigerating machine oil has a saturated water content of 1000 wt ppm or more.6. The ...

CONTROL METHOD FOR AIR CONDITIONER

The air conditioner includes a compressor and an indoor unit. The method includes: obtaining a coil temperature of the indoor unit and selectively adjusting the frequency of the compressor according to the coil temperature of the indoor unit. According to the method, the operating frequency of the compressor is adjusted by determining a temperature interval in which the coil temperature of the indoor unit is, so as to avoid the icing of the indoor unit of the air conditioner, thereby effectively solving the icing problem of the indoor unit of the air conditioner, and also improving the operation stability and reliability of the air conditioner. 16-. (canceled)7. A control method for an air conditioner , the air conditioner including a compressor and an indoor unit , the control method comprising:acquiring coil temperature of the indoor unit; andselectively adjusting frequency of the compressor according to the coil temperature of the indoor unit.8. The control method according to claim 7 , wherein selectively adjusting frequency of the compressor according to the coil temperature of the indoor unit comprises:operating the compressor at a decreased frequency if the coil temperature of the indoor unit is lower than a first preset temperature.9. The control method according to claim 8 , wherein “selectively adjusting frequency of the compressor according to the coil temperature of the indoor unit further comprises:maintaining the operating frequency of the compressor unchanged if the coil temperature of the indoor unit is higher than or equal to the first preset temperature and lower than or equal to a second preset temperature,wherein the first preset temperature is lower than the second preset temperature.10. The control method according to claim 9 , wherein selectively adjusting frequency of the compressor according to the coil temperature of the indoor unit further comprises:operating the compressor at an increased frequency if the coil temperature of the indoor ...

AIR-CONDITIONING APPARATUS

An air-conditioning apparatus includes a refrigerant circuit formed by connecting a compressor that discharges a zeotropic refrigerant, an outdoor-side heat exchanger that exchanges heat between outside air and the refrigerant, a first expansion device that regulates the pressure of the refrigerant, and a load-side heat exchanger that exchanges heat between the air in an air-conditioning target space and the refrigerant. The air-conditioning apparatus includes a controller that has a composition computing function unit and a composition determining function unit The composition determining function unit is configured to adopt a predetermined value set in advance and related to composition as a circulating composition if the computation result is determined as incorrect, and adopt the computation result as the circulating composition if the computation result is determined as correct. 1. An air-conditioning apparatus in which a refrigerant circuit is formed by connecting , by a refrigerant pipe ,a compressor that discharges a refrigerant, which is a zeotropic refrigerant mixture including a plurality of components with different boiling points,an outdoor-side heat exchanger that exchanges heat between air outside an air-conditioning target space and the refrigerant,a first expansion device that regulates a pressure of the refrigerant, anda load-side heat exchanger that exchanges heat between air in the air-conditioning target space and the refrigerant,the air-conditioning apparatus comprising a controller, the controller including:a composition computing function unit configured to compute a circulating composition, the circulating composition representing a value of composition of each of components in the refrigerant circulating through the refrigerant circuit; anda composition determining function unit configured to determine whether or not a computation result of the composition computing function unit is correct, adopt a value of the composition of each of the ...

Compressor driving motor and cooling method for same

A compressor driving motor includes: a rotor; a stator surrounding an outer peripheral part of the rotor; a case accommodating the rotor and the stator; a liquid introduction path introducing a liquid refrigerant from a refrigerant circuit including a compressor; and a gas introduction path introducing a gas refrigerant from the refrigerant circuit. The case includes a downstream chamber located on one end side of the rotor and the stator in an axial direction and provided with the compressor, and an upstream chamber located on the other end side in the axial direction and communicating with the downstream chamber through a gap between the outer peripheral part of the rotor and an inner peripheral part of the stator. The introduced liquid refrigerant and the introduced gas refrigerant are mixed in the upstream chamber, and wet steam of the mixed refrigerant is supplied to at least the gap.

CENTRIFUGAL COMPRESSOR

A centrifugal compressor includes a casing, a first compression mechanism and a second compression mechanism. The casing has a first inlet portion, a first outlet portion, a second inlet portion and a second outlet portion. The first compression mechanism includes a first inlet guide vane disposed in the first inlet portion, a first impeller disposed downstream of the first inlet guide vane, a first diffuser disposed in the first outlet portion downstream from the first impeller, and a first motor. The second compression mechanism includes a second inlet guide vane disposed in the second inlet portion, a second impeller disposed downstream of the second inlet guide vane, a second diffuser disposed in the second outlet portion downstream from the second impeller, and a second motor. The first and second motors are arranged to rotate first and second shafts in order to rotate the first and second impellers. 1. A centrifugal compressor comprising:a casing having a first inlet portion, a first outlet portion, a second inlet portion and a second outlet portion; a first inlet guide vane disposed in the first inlet portion,', 'a first impeller disposed downstream of the first inlet guide vane, the first impeller being attached to a first shaft rotatable about a first rotation axis,', 'a first diffuser disposed in the first outlet portion downstream from the first impeller, and', 'a first motor arranged to rotate the first shaft in order to rotate the first impeller; and, 'a first compression mechanism including'} a second inlet guide vane disposed in the second inlet portion,', 'a second impeller disposed downstream of the second inlet guide vane, the second impeller being attached to a second shaft rotatable about a second rotation axis,', 'a second diffuser disposed in the second outlet portion downstream from the second impeller, and', 'a second motor arranged to rotate the second shaft in order to rotate the second impeller., 'a second compression mechanism including'} ...

Air Conditioner And Method For Controlling The Same

An air conditioner and a control method thereof are provided. The air conditioner includes: a compressor including a coil; an oil pool connected to the compressor through an oil piping; a main control board configured to receive a power-on signal of the air conditioner, obtain an actual temperature of the oil pool after receiving the power-on signal, generate a required heating amount in response to the actual temperature of the oil pool being lower than a preset startup temperature, and generate timing control signals according to the required heating amount; a power device, wherein two sides of the power device are respectively connected to the main control board and the coil, and the power device is configured to drive the coil to heat the oil pool according to the timing control signals generated by the main control board. 1. An air conditioner , including:a compressor including a coil;an oil pool connected to the compressora main control board configured to receive a power-on signal of the air conditioner, obtain an actual temperature of the oil pool after receiving the power-on signal, generate a required heating amount in response to the actual temperature of the oil pool being lower than a preset startup temperature, and generate timing control signals according to the required heating amount;a power device, wherein two sides of the power device are respectively connected to the main control board and the coil, and the power device is configured to drive the coil to heat the oil pool according to the timing control signals generated by the main control board.2. The air conditioner according to claim 1 , wherein the main control board is further configured to control the air conditioner to operate in response to the actual temperature of the oil pool being higher than or equal to the preset startup temperature.3. The air conditioner according to claim 1 , wherein the coil includes three stator coils; wherein claim 1 ,the power device is configured to drive ...

HIGH PERFORMANCE COMPRESSORS AND VAPOR COMPRESSION SYSTEMS

The present disclosure relates to a new breed of high performance compressors and associated vapor compression systems that can be used in wide ranging refrigeration, cooling and heating applications with significantly increased compressor isentropic efficiency, motor efficiency, reliability and longevity of the motor, the compressor pump and the system as a whole, as well as COP, heating capacity, and SEER of the new vapor compression systems utilizing the new high performance compressors. The design philosophy and modifications to the current configuration of rolling piston rotary compressor to arrive at the high-performance version of the same type will be readily applicable to other types of vapor compression compressors with only minor changes opening the way for adoption of the new design philosophy by the entire compressor industry resulting in serious reduction of carbon footprint for air conditioners, heat pumps and refrigerators worldwide. 137-. (canceled)38. A compressor comprising:at least one pressure containment shell;a motor and a motor heat exchanger, wherein the motor and the motor heat exchanger are positioned in a pressure containment shell of the at least one pressure containment shell;a pump body positioned in a pressure shell of the at least one pressure containment shell;wherein the pump body includes a pump operatively coupled to the motor;wherein the motor heat exchanger is configured to accept refrigerant diverted from a condenser or a high pressure heat exchanger of a refrigeration system, whereby the motor heat exchanger is configured to cool the motor, to decrease operating temperature of the motor, and to increase electrical efficiency of the motor;a compression chamber within the pump body; andat least one supercharging port or valve provided in the pump body leading into the compression chamber configured to receive the diverted refrigerant, after cooling the motor, such that the diverted refrigerant is injected back into the ...

Control Circuit, Signal Conversion Circuit and Control Method

A control circuit, a signal conversion circuit and a control method are disclosed. The control circuit includes a controller, which controls a load circuit according to a received input signal; and an enable module, which is connected to the controller and enables the controller on the basis of a frequency of the input signal, wherein the controller is caused to be in an operational state so as to control the load circuit according to the input signal when the frequency is higher than a predetermined threshold, and the controller is caused to be in a sleep state and thus not control the load circuit according to the input signal when the frequency is lower than the predetermined threshold 1. A control circuit , comprising:a controller configured to control a load circuit according to a received input signal; andan enable module connected to the controller and configured to enable the controller based on a frequency of the input signal,wherein the controller is configured to be in an operational state to control the load circuit according to the input signal when the frequency is higher than a predetermined threshold,wherein the controller is configured to be in a sleep state and to not control the load circuit according to the input signal when the frequency is lower than the predetermined threshold.2. The control circuit of claim 1 , wherein the enable module comprises:an input unit configured to receive the input signal;a switch unit configured to output an enable signal via an output end;a voltage conversion unit having an enable terminal connected to the output end of the switch unit to receive the enable signal, and an output terminal of the voltage conversion unit connected to a power supply input terminal of the controller; anda switch control loop connected between the input unit and the switch unit, and configured to control a switching of the switch unit ON and OFF based on a frequency of the input signal,wherein the switch unit is configured to be ON when ...

METHOD FOR CONTROLLING ELECTRIC COMPRESSOR OF HEAT PUMP SYSTEM FOR AN AUTOMOTIVE VEHICLE

Disclosed herein is a method for controlling an electromotive compressor in a heat pump system for a vehicle. In accordance with an embodiment of the present invention, an unexpected cutoff of a compressor attributable to overload and the generation of noise and vibration attributable to frequent restarts can be prevented by controlling the number of rotations of the compressor within a specific range based on the discharge pressure of the compressor. 1. A method for controlling an electromotive compressor in a heat pump system for a vehicle , comprising:providing a controller in communication with a temperature sensor, a pressure sensor, a memory, and the compressor;receiving a predetermined target temperature selected by a user of the vehicle and a room temperature detected by the temperature sensor by the controller;calculating a number of rotations of the compressor based on the target temperature and the room temperature by the controller;receiving a discharge pressure of the compressor detected by the pressure sensor by the controller;decreasing the number of rotations of the compressor by the controller if the discharge pressure is one of equal to and greater than a predetermined maximum heating upper-limit discharge pressure in a heating operation of the heat pump system; andincreasing the number of rotations of the compressor by the controller if the discharge pressure is one of equal to and less than a predetermined maximum heating lower-limit discharge pressure in the heating operation of the heat pump system, wherein the number of rotations of the compressor is increased by a slew rate if the discharge pressure is one of equal to and less than the maximum heating lower-limit discharge pressure and the room temperature is less than the target temperature after a lapse of a specific time.2. The method according to claim 1 , wherein the slew rate is increased by a specific ratio if the number of rotations of the compressor is increased.3. The method ...

Heat-transfer fluid for a centrifugal compressor

A process for cooling or heating a fluid or a body by means of a vapour compression circuit including a centrifugal compressor and containing a heat-transfer fluid, the heat-transfer fluid including at least two compounds selected from 2,3,3,3-tetrafluoropropene, 1,3,3,3-tetrafluoropropene, 1,1,1,2-tetrafluoropropene, 1,1-difluoroethane and 3,3,3-trifluoropropene, in which: the ratio of the Mach number of the centrifugal compressor to the Mach number which the centrifugal compressor has under the same operating conditions if the heat-transfer fluid is replaced with 1,1,1,2-tetrafluoroethane in the vapour compression circuit is greater than or equal to 0.97 and less than or equal to 1.03; the compression ratio of the centrifugal compressor is less than or equal to the compression ratio which the centrifugal compressor has under the same operating conditions if the heat-transfer fluid is replaced with 1,1,12-tetrafluorethane in the vapour compression circuit.

TURBO-COMPRESSOR-CONDENSER-EXPANDER

An isothermal turbo-compressor-condenser-expander (ITCCE) includes heat-transferring fan blades that are mounted on, or surround, individual conduits to promote air exchange and heat transfer. In operation, the open framework rotates in free air to promote heat exchange. An ITCCE bladed assembly includes a driven central hub assembly with a first fluid coupling. A first inner plenum is in fluid communication with the fluid coupling. A plurality of compressor multiport conduits extend radially, and pass fluid from, the first inner plenum to an outer plenum that acts as an equalizing line. A return path is provided to the fluid coupling from the outer plenum. The conduits can be formed as metal extrusions, including internal ribs that separate a plurality of ports formed therebetween along an entire length of the conduits. The conduits can define an airfoil shape and/or are axially twisted, generating axial airflow. The return path can include return multiport conduits. 1a driven central hub assembly with a first fluid coupling;a first inner plenum in fluid communication with the fluid coupling;a plurality of compressor multiport conduits extending radially and passing fluid from the first inner plenum to an outer plenum; anda return path to an outlet fluid coupling.. A bladed assembly for an isothermal turbo-compressor-condenser-expander (ITCCE) assembly comprising: This application is a continuation of co-pending U.S. patent application Ser. No. 14/543,868, filed Nov. 17, 2014, entitled TURBO-COMPRESSOR-CONDENSER-EXPANDER, which is related to commonly assigned U.S. patent application Ser. No. 14/078,453, filed Nov. 12, 2013, entitled TURBO-COMPRESSOR-CONDENSER-EXPANDER, which is a divisional of co-pending U.S. patent application Ser. No. 12/691,383, filed Jan. 21, 2010, entitled TURBO-COMPRESSOR-CONDENSER-EXPANDER, now U.S. Pat. No. 8,578,733, issued Nov. 12, 2013, which claims the benefit of U.S. Provisional Patent Application Ser. No. 61/146,022, filed Jan. 21, ...

CONTROLLING AIR CONDITIONER MODES

In various implementations, a request for operation of an air conditioner may be received. The air conditioner may include a cooling mode and/or a dehumidifying mode. In some implementations, a compressor speed for a compressor of the air conditioner may be determined, and which mode(s) of the air conditioner to allow may be determined based at least partially on the determined compressor speed. 1. A method of controlling an air conditioner , the method comprising:receiving a request for operation of an air conditioner comprising at least two modes, wherein at least two of the modes comprise a cooling mode and a dehumidifying mode;determining a compressor speed for a compressor of the air conditioner; and allowing the cooling mode if the compressor speed is greater than a predetermined first speed;', 'allowing the cooling mode and the dehumidifying mode if the compressor speed is less than the predetermined first speed and if the compressor speed is greater than a predetermined second speed; and', 'allowing the dehumidifying mode if the compressor speed is less than the predetermined second speed and a relative humidity is greater than a predetermined high relative humidity value; and', 'allowing the cooling mode if the compressor speed is less than the predetermined second speed and a relative humidity is less than or equal to the predetermined high relative humidity value., 'determining which one or more of the modes of the air conditioner to allow based at least partially on the determined compressor speed, wherein determining which one or more of the modes to allow comprises2. The method of further comprising allowing the air conditioner to operate based at least partially on the one or more modes of the air conditioner determined to be allowed.3. The method of wherein the request for operation includes a set point temperature claim 1 , and wherein the compressor speed is less than the predetermined second speed claim 1 , and further comprising reducing the set ...

TURBO CHILLER

A turbo chiller that has an oil-free configuration, which reduces the frequency of maintenance and maintenance-induced release of refrigerant, and can achieve a reduced environmental impact by utilizing the characteristics of the low-pressure refrigerant R1233zd(E) that reaches negative pressure at a saturation temperature of 18° C. or lower. The turbo chiller comprises a refrigeration cycle that includes a turbo compressor, a condenser, a decompression device, and an evaporator connected in sequence via piping and is filled with a refrigerant; wherein the refrigerant is a low-pressure refrigerant R1233zd(E) refrigerant with low global warming potential and low ozone depletion potential; the turbo compressor has a direct drive configuration in which a rotating shaft of impellers is directly joined to a motor; and the rotating shaft is supported by magnetic bearings.

REFRIGERATION CYCLE APPARATUS

The present invention has an object to provide a refrigeration cycle apparatus. A refrigeration cycle apparatus according to the present invention includes: a compressor; and a control apparatus configured to calculate a rotation number command of the compressor. The control apparatus includes a capacity controller configured to calculate the rotation number of the compressor as a capacity rotation number, a protection controller configured to calculate the rotation number of the compressor as a protection rotation number and a rotation number selection unit configured to select any one of the capacity rotation number and the protection rotation number as the rotation number command of the compressor. The rotation number command of the compressor is calculated so that at least any one of causing the current capacity value to approach the capacity target value and causing the protection variable to approach the protection target value is satisfied.

COMPRESSOR DRIVING MOTOR AND COOLING METHOD FOR SAME

A compressor driving motor includes: a rotor; a stator surrounding an outer peripheral part of the rotor; a case accommodating the rotor and the stator; a liquid introduction portion introducing a liquid refrigerant from a refrigerant circuit including the compressor into the case; a gas introduction portion introducing a gas refrigerant from the refrigerant circuit into the case; and an injector using, as driving fluid, the gas refrigerant introduced by the gas introduction portion, and using, as suction fluid, the liquid refrigerant introduced by the liquid introduction portion. Wet steam of a mixture of the liquid refrigerant and the gas refrigerant mixed by the injector is injected toward at least a gap between the outer peripheral part of the rotor and an inner peripheral part of the stator. 111.-. (canceled)12. A compressor driving motor driving a compressor , the compressor driving motor comprising:a rotor;a stator that surrounds an outer peripheral part of the rotor;a case that accommodates the rotor and the stator;a liquid introduction portion that introduces a liquid refrigerant from a refrigerant circuit into the case, the refrigerant circuit including the compressor;a gas introduction portion that introduces a gas refrigerant from the refrigerant circuit into the case; andan injector that uses, as driving fluid, the gas refrigerant introduced by the gas introduction portion, and uses, as suction fluid, the liquid refrigerant introduced by the liquid introduction portion, whereinwet steam of a mixture of the liquid refrigerant and the gas refrigerant mixed by the injector is injected to at least a gap between the outer peripheral part of the rotor and an inner peripheral part of the stator.13. The compressor driving motor according to claim 12 , whereinthe injector includes an injection port through which the wet steam is injected, andthe injection port faces an opening of the gap opened in an axis line direction of the rotor.14. The compressor driving ...

HEAT SOURCE UNIT AND REFRIGERATION DEVICE

A heat source unit constitutes a refrigeration apparatus by being connected to a utilization-side unit. The heat source unit includes a low-stage compression element, a high-stage compression element, and a heat exchanger. The low-stage compression element has a discharge pipe provided with a pressure switchgear. The high-stage compression element compresses a refrigerant discharged from the low-stage compression element. When the low-stage compression element is paused in response to activation of the pressure switchgear, the high-stage compression element operates while the low-stage compression element is kept paused. 1. A heat source unit constituting a refrigeration apparatus by being connected to a utilization-side unit , the heat source unit comprising:a low-stage compression element; a high-stage compression element; and a heat exchanger, whereinthe low-stage compression element has a discharge pipe provided with a pressure switchgear,the high-stage compression element compresses a refrigerant discharged from the low-stage compression element, andwhen the low-stage compression element is paused in response to activation of the pressure switchgear, the high-stage compression element operates while the low-stage compression element is kept paused.2. The heat source unit of claim 1 , whereinwhen the pressure switchgear is activated, the high-stage compression element is paused once, and is then restarted.3. The heat source unit of claim 2 , further comprising:a pressure equalization circuit configured to equalize a suction pressure and a discharge pressure of the high-stage compression element after the high-stage compression element is paused and before the high-stage compression element is restarted.4. The heat source unit of claim 3 , further comprising:a receiver provided between the heat exchanger and a liquid-side shutoff valve connected to the utilization-side unit, whereinthe pressure equalization circuit includes a venting pipe for the receiver.5. The ...

SYSTEM AND METHOD OF OPERATING A VARIABLE SPEED COMPRESSOR WITH A TWO-STAGE CONTROLLER

A system and method of operating an HVAC system including a HVAC unit including a unit temperature sensor, a unit controller, and a variable speed compressor, and a two-stage system controller in communication with the unit controller, the method including operating the system controller to transmit a conditioning signal to the unit controller based in part on a system demand, operating the unit controller to receive the conditioning signal, and receive outdoor air temperature data from the unit temperature sensor, operating the unit controller to determine whether the outdoor air temperature data is greater than or equal to a cooling temperature limit or less than or equal to a heating temperature limit, and operating the unit controller to transmit a speed signal to the compressor based in part on the plurality of conditioning signals and the outdoor air temperature data. 1. A method for operating an HVAC system , the HVAC system including an HVAC unit including a unit temperature sensor , a unit controller , and a compressor configured to operate at multiple speeds , and a two-stage system controller in communication with the unit controller , the method comprising:(a) operating the two-stage system controller to transmit a conditioning signal to the unit controller based in part on a system demand;(b) operating the unit controller to receive the conditioning signal, and receive outdoor air temperature data from the unit temperature sensor;(c) operating the unit controller to determine whether the outdoor air temperature data is greater than or equal to a cooling temperature limit or less than or equal to a heating temperature limit; and(d) operating the unit controller to transmit a speed signal to the compressor based in part on the conditioning signal and the outdoor air temperature data.2. The method of claim 1 , wherein the step (a) further comprises operating the two-speed system controller to transmit at least one of a first cooling conditioning signal ...

Economized Centrifugal Compressor

A compressor () has a housing assembly () with a suction port (), a discharge port (), and an economizer port (). An impeller () is mounted to be driven in at least a first condition so as to draw a main flow of fluid through the suction port and discharge the fluid from the discharge port. A diffuser () has a plurality of diffuser passages (). Each diffuser passage has an inlet () positioned to receive fluid from the impeller and an outlet () downstream of the inlet in the first condition. One or more passages () are positioned to draw an economizer flow of fluid from the economizer port and deliver the economizer flow downstream of the impeller inlet () but upstream of the diffuser passage outlets (). 1. A centrifugal compressor comprising:a housing assembly having a suction port, a discharge port, and an economizer port;an impeller mounted to be driven in at least a first condition so as to draw a main flow of fluid in through the suction port and discharge said fluid out from the discharge port;a diffuser having one or more diffuser passages each having an inlet positioned to receive fluid from the impeller and an outlet downstream of the inlet in the first condition; andone or more passages positioned to draw an economizer flow of fluid from the economizer port and deliver the economizer flow between the impeller and the diffuser passage inlets.2. The compressor of further comprising: a stator within a motor compartment of the case; and', 'a rotor within the stator, the rotor being mounted for rotation about a rotor axis., 'an electric motor having3. The compressor of wherein:the one or more passages are positioned to deliver said economizer flow of fluid through a gap between an impeller shroud and the diffuser.4. The compressor of wherein:the impeller shroud is a portion of the housing assembly between the impeller and the diffuser passage inlets.5. The compressor of wherein:the compressor is a single-stage compressor.6. The compressor of wherein:the one or ...

REFRIGERATION CYCLE DEVICE

A first evaporator cools air-conditioning air. A second evaporator cools an object. A first orifice unit and a second orifice unit are capable of changing a refrigerant amount of the first evaporator and the second evaporator, respectively. A control unit controls both the first orifice unit and the second orifice unit so that a temperature of the second evaporator approaches a target temperature. The control unit, in a first mode, performs control not to evaporate a refrigerant at the first evaporator and to evaporate the refrigerant at the second evaporator. The control unit, in a second mode, performs control to evaporate the refrigerant at both the first evaporator and the second evaporator. The control unit sets the target temperature in a first mode higher than that in a second mode. 1. A refrigerant cycle device , comprising:a compressor which compresses and discharges a refrigerant;a radiator which dissipates heat from the refrigerant discharged from the compressor;a first evaporator for evaporating the refrigerant;a second evaporator which evaporates the refrigerant by absorbing heat from a thermal medium circulating between a heat absorb object or from the heat absorb object;a first orifice unit capable of changing a flow amount of the refrigerant flowing into the first evaporator;a second orifice unit capable of changing a flow amount of the refrigerant flowing into the second evaporator; anda control unit, including at least one hardware processor circuit, which controls operation of the compressor and the second orifice unit so that a temperature relating to a temperature of the second evaporator approaches a target temperature, whereinthe control unit is configured to switch:a first mode in which the first orifice unit and the second orifice unit are controlled so that the refrigerant does not evaporate in the first evaporator and the refrigerant evaporates in the second evaporator; anda second mode in which the first orifice unit and the second ...

LOAD OPERATION CONTROL SYSTEM

A drive shaft rotates a load. A drive support rotates the drive shaft and supports a radial load of the drive shaft in a non-contact manner, by an electromagnetic force generated by the flow of a current within a predetermined current range through the drive support. A control section controls an operation of the load based on a magnetic flux margin degree expressed by the difference between a total magnetic flux amount generated at the drive support and a predetermined limit of the total magnetic flux amount for the drive support. The total magnetic flux amount includes driving magnetic flux and the supporting magnetic flux in a predetermined operation region of the load. The driving magnetic flux is generated at the drive support for rotating the drive shaft. The supporting magnetic flux is generated at the drive support for supporting a radial load of the drive shaft. 1. A load operation control system , comprising:a drive shaft which rotates a load;a drive support which rotates the drive shaft and supports a radial load of the drive shaft in a non-contact manner, by an electromagnetic force generated by flow of a current within a predetermined current range through the drive support; anda control section which controls an operating condition of the load based on a magnetic flux margin degree expressed by a difference between: a total magnetic flux amount including driving magnetic flux and supporting magnetic flux; and a predetermined limit of the total magnetic flux amount for the drive support, the driving magnetic flux being generated at the drive support for rotating the drive shaft and the supporting magnetic flux being generated at the drive support for supporting the radial load of the drive shaft in a predetermined operation region of the load.2. The system of claim 1 , whereinthe drive support has at least one bearingless motor having a set of a rotor and a stator to rotate the drive shaft and supporting the radial load of the drive shaft in a non- ...

CONTROL DEVICE FOR REFRIGERATOR SYSTEM, REFRIGERATOR SYSTEM, CONTROL METHOD FOR REFRIGERATOR SYSTEM, AND CONTROL PROGRAM FOR REFRIGERATOR SYSTEM

There is provided a chiller control device () of a chiller system () that is provided with a centrifugal chiller () provided with a compressor () rotated by a motor (), an operation panel () which is provided in the centrifugal chiller (), operates the centrifugal chiller (), and displays a state of the centrifugal chiller (), and a starting panel () which supplies power to the motor () and starts the motor (). The starting panel () begins supplying power to the motor () of the compressor () in response to a start command from the centrifugal chiller () to start the motor (), and outputs a start answer and a start completion signal to the centrifugal chiller (), and an abnormal state is output to the operation panel () if the start answer and/or the start completion signal continue to be output after the centrifugal chiller () has stopped. 110-. (canceled)11. A control device for a chiller system that is provided with a chiller provided with a compressor rotated by a rotor , an operation panel which is provided in the chiller , operates the chiller , and displays a state of the chiller , and a starting panel which supplies power to the motor and starts the motor ,wherein the starting panel begins supplying power to the motor of the compressor in response to a start command from the chiller to start the motor, and outputs a motor start signal and a start completion signal to the chiller, andwherein if the motor start signal and/or the start completion signal continue to be output after the chiller has stopped, an emergency stop command is output from the operation panel to the starting panel.12. The control device for a chiller system according to claim 11 ,wherein the emergency stop command is a maintained signal.13. The control device for a chiller system according to claim 11 ,wherein if the motor start signal and/or the start completion signal continue to be output after the chiller has stopped, a chilled water pump provided in an evaporator connected to the ...

BRAKE SYSTEM FOR A COMPRESSOR

A heating, ventilation, and/or air conditioning (HVAC) system includes a compressor having an impeller configured to rotate and drive a working fluid through a working fluid circuit of the HVAC system in an active operating mode. The HVAC system further includes a controller configured to, in response to receiving an input indicative of a transition to operate in an inactive operating mode, suspend the active operating mode by interrupting a supply of power to the compressor, adjust pre-rotation vanes of the compressor, a variable geometry diffuser of the compressor to a first position, or both to enable a backflow of the working fluid through the compressor for a first interval of time, and, after the first interval of time has elapsed, adjust the pre-rotation vanes, the variable geometry diffuser, or both to a second position to block the backflow of the working fluid through the compressor. 1. A heating , ventilation , and/or air conditioning (HVAC) system , comprising:a compressor comprising an impeller configured to rotate and drive a working fluid through a working fluid circuit of the HVAC system in an active operating mode of the HVAC system; and suspend the active operating mode of the HVAC system by interrupting a supply of power to the compressor;', 'adjust pre-rotation vanes of the compressor, a variable geometry diffuser of the compressor to a first position, or both to enable a backflow of the working fluid through the compressor for a first interval of time; and', 'after the first interval of time has elapsed, adjust the pre-rotation vanes of the compressor, the variable geometry diffuser of the compressor, or both to a second position to block the backflow of the working fluid through the compressor., 'a controller configured to, in response to receiving an input indicative of a transition of the HVAC system to operate in an inactive operating mode2. The HVAC system of claim 1 , wherein the first position of the pre-rotation vanes and/or the variable ...

Capacity Staging System For Multiple Compressors

A control system for controlling an output for at least one compressor includes a control unit that receives an indoor set point and an outdoor ambient temperature. The control unit determines a load request based on the indoor set point and the outdoor ambient temperature without considering an indoor room temperature. The at least one compressor receives control commands from the control unit based on the load request. 1. A control system for controlling an output for at least one compressor , said control system comprising:a control unit receiving an indoor set point and an outdoor ambient temperature and determining a load request based on the indoor set point and the outdoor ambient temperature and not based on an indoor room temperature; andat least one compressor receiving control commands from the control unit based on the load request.2. The control system of claim 1 , wherein the load request is a sensible load request.3. The control system of claim 1 , wherein the load request is a latent load request based on a sensible load request and a relative humidity output from a humidity sensor.4. The control system of claim 1 , wherein the control unit includes a sensible load determination unit that determines a sensible load request based on a sensible load model claim 1 , the indoor set point claim 1 , and the outdoor ambient temperature claim 1 , the sensible load model being determined based on at least one of a type and a location of a plurality of building walls claim 1 , a size of the building claim 1 , a number and a size of a plurality of building rooms claim 1 , a number claim 1 , a size claim 1 , and a location of a plurality of building windows claim 1 , a number and a location of a plurality of air conditioning vents claim 1 , an amount claim 1 , a type claim 1 , and a location of insulation claim 1 , a type of furniture claim 1 , a regional location of the building claim 1 , a number of people living or working in the building claim 1 , a number ...

REFRIGERATOR AND CONTROL METHOD THEREFOR

The present disclosure relates to a refrigerator and a method for controlling the same. The present disclosure provides a method for controlling the same, the method including an initial driving step of driving a compressor according to a rotation per minute (RPM) at which the compressor is driven in a previous cycle, an RPM adjusting step of increasing the RPM when an operation rate is larger than a first setting value, decreasing the RPM when the operation rate is smaller than the second setting value, and maintaining the RPM when the operation rate is between the first setting value and the second setting value, in consideration of the operation rate of the previous cycle, and a driving step of driving the compressor according to the adjusted RPM, wherein the first setting value is larger than the second setting value. 152-. (canceled)53. A refrigerator comprising:an inverter-type compressor, a rotation per minute (RPM) of which is variably adjusted by adjusting a frequency;an evaporator to which a refrigerant compressed by the compressor is supplied after being condensed and expanded, and which is heat-exchanged with air in a storage space;a thermostat switched on/off depending on a temperature of the storage space cooled by the evaporator; anda compressor printed circuit board (PCB) configured to drive the compressor according to an ON/OFF state of the thermostat,wherein the compressor PCB comprises:a thermostat recognition unit connected to the thermostat to receive an ON/OFF signal of the thermostat; anda microcomputer configured to integrate and store an operation time and a stop time of the compressor during a cycle from a time point at which the compressor starts to be operated to a time point at which the compressor is stopped and then restarts to be operated, and calculate an operation rate, andwherein the microcomputer is connected to the thermostat recognition unit to calculate the operation rate according to an ON/OFF signal of the thermostat ...

TURBO REFRIGERATOR

A turbo refrigerator is provided with: a turbo compressor having a motor; an oil cooling unit which cools lubricating oil which is supplied to at least a portion of the turbo compressor; a refrigerant introduction part which introduces some of the refrigerant which circulates between an evaporator and a condenser into a motor accommodation space and the oil cooling unit; and a cooling unit which cools the refrigerant which is introduced into the motor accommodation space and the oil cooling unit. 1. A turbo refrigerator comprising:a turbo compressor having a motor;an oil cooling unit which cools lubricating oil which is supplied to at least a portion of the turbo compressor;a refrigerant introduction part which introduces some of a refrigerant which circulates between an evaporator and a condenser into a motor accommodation space and the oil cooling unit; anda cooling unit which cools the refrigerant which is introduced into the motor accommodation space and the oil cooling unit,wherein the cooling unit is a compressor which decompresses the insides of the motor accommodation space and the oil cooling unit, thereby cooling the refrigerant which is introduced into the motor accommodation space and the oil cooling unit, and recovers the refrigerant from the insides of the motor accommodation space and the oil cooling unit and then returns the refrigerant to the evaporator.2. The turbo refrigerator according to claim 1 , further comprising:an oil returning unit which returns the lubricating oil accumulated in the motor accommodation space to an oil tank in which the lubricating oil is stored.3. The turbo refrigerator according to claim 2 , wherein the oil returning unit is an ejector which moves the lubricating oil by using a compressed refrigerant gas produced by the turbo compressor.4. The turbo refrigerator according to claim 1 , a bearing which rotatably supports a rotating shaft of the motor;', 'a first non-contact sealing mechanism and a second non-contact ...

SYSTEM AND METHOD FOR FEEDING AND CONTROLLING A VARIABLE CAPACITY COMPRESSOR, A VARIABLE CAPACITY COMPRESSOR AND A COOLER COMPRISING A VARIABLE CAPACITY COMPRESSOR

A variable capacity compressor (), a cooler () including same, and a method and system for controlling a variable capacity compressor are disclosed. An electronic control (), a thermostat () and a power source () are disclosed, the power source including a neutral terminal and a phase terminal, the thermostat including a first terminal and a second terminal, and the electronic control including a phase feed input and a neutral feed input, the neutral terminal of the power source electrically connected to the neutral feed input of the electronic control and the phase terminal of the power source electrically connected to the first terminal of the thermostat, the second terminal of the thermostat connected electrically to the phase feed input of the electronic control, the thermostat configured to feed and un-feed selectively the electronic control, the electronic control activating and deactivating selectively the compressor and controlling its cooling capacity. 1100200. A system for feeding and controlling a variable capacity compressor () in a cooled environment () , said system comprising:{'b': '50', 'an electronic control (),'}{'b': 30', '200, 'a thermostat () arranged in the cooled environment (), and'}{'b': '10', 'a power source (),'}{'b': 30', '50, 'the power source comprising a neutral terminal and a phase terminal, the thermostat () comprising a first terminal and a second terminal, and the electronic control () comprising a phase feed input and a neutral feed input,'}{'b': 10', '50', '10', '30', '30', '50, 'wherein the neutral terminal of the power source () is electrically connected to the neutral feed input of the electronic control (), and the phase terminal of the power source () is electrically connected to the first terminal of the thermostat (), the second terminal of the thermostat () being electrically connected to the phase feed input of the electronic control (),'}{'b': 30', '50, 'the thermostat () being configured to feed and un-feed selectively ...

Refrigeration System with Adiabatic Electrostatic Cooling Device

An evaporative cooling device for a refrigeration system includes one or more heat exchanger coils, a first moisture panel, a second moisture panel, a first nozzle array, a second nozzle array, a moisture sensor, and a controller. The first moisture panel and the second moisture panel are separated by a distance and disposed external to the one or more heat exchanger coils. The first nozzle array is disposed external to the first moisture panel and the second nozzle array is disposed external to the second moisture panel. The first nozzle array and the second nozzle array are configured to provide an atomized spray of electrostatically charged droplets. The moisture sensor is configured to provide a signal representative of a moisture level. The controller is configured to receive the signal representative of the moisture level and control a supply of water. 1. (canceled)2. A cooling system , comprising:at least one heat exchanger configured to receive a flow of a gas refrigerant and an ambient airflow;at least one moisture panel disposed external to the at least one heat exchanger;at least one nozzle disposed external to the at least one moisture panel and configured to distribute an electrostatically charged liquid to the at least one moisture panel;at least one fan positioned to circulate the ambient airflow through the at least one moisture panel and from the at least one moisture panel to and through the at least one heat exchanger; anda controller configured to perform operations comprising controlling a supply of the electrostatically charged liquid to the at least one nozzle.3. The cooling system of claim 2 , wherein the controller is configured to control the supply of the electrostatically charged liquid to the at least one nozzle based at least in part on a signal from a moisture sensor that is representative of a moisture level of the at least one moisture panel.4. The cooling system of claim 3 , wherein the moisture sensor is positioned at or near a ...

SYSTEM AND METHOD FOR CONTROLLING A VARIABLE SPEED DRIVE OF A COMPRESSOR MOTOR

A variable speed drive (VSD) can be used to vary the voltage-to-frequency ratio (V/f) supplied to a compressor motor of a heating, ventilation, air conditioning or refrigeration (HVAC&R) system to make the motor stronger or weaker to compensate for varying conditions in the HVAC&R system. The VSD and corresponding control system or algorithm can monitor an operating parameter of the HVAC&R system, such as the kW absorbed by the motor, and then raise or lower the V/f of the VSD to obtain the lowest possible power consumption from the motor. 1. A system comprising:a compressor, a condenser, an expansion device and an evaporator connected in a closed refrigerant circuit;a motor connected to the compressor to power the compressor;a variable speed drive connected to the motor to power the motor, the variable speed drive being operable to provide a variable voltage to the motor and a variable frequency to the motor;a control panel to control operation of the variable speed drive and one or more components of the system;a sensor to measure an operational parameter of the system, the sensor being operable to communicate the measured operational parameter to the control panel; andthe control panel being operable to execute a control algorithm to determine a voltage-to-frequency ratio to be output by the variable speed drive using the measured operational parameter, wherein the voltage-to-frequency ratio varies based on the measured operational parameter.2. The system of wherein the sensor measures power consumption of the motor.3. The system of wherein the sensor measures a discharge temperature of the compressor.4. The system of wherein the sensor measures a temperature of the motor.5. The system of wherein the control algorithm includes a table of voltage-to-frequency ratios and corresponding operational parameter values.6. The system of wherein the control algorithm includes a fuzzy logic algorithm to determine the voltage-to-frequency ratio.7. The system of wherein the ...

"CPTS" constant product temperature scanner

The CPTS is a new device that allows the refrigerator or freezer to run about half the time of normal and maintain food freshness while saving from 50% to almost 70% on the monthly electric bill by using a laser sensor which operates at a 360 Degree and 90 Degree functionality that senses food temperature inside the box and renders a reading that sends an output signal to the compressor in the refrigeration unit and brings the temperature to its proper setting. 1. The device has a pre-programmable ability to allow 6 or more position settings to enable the laser sensor to constantly sense temperature changes and send an output signal to the control box to start the compressor motor to cool the room to a proper food temperature from low to high with a IR non-contact visible light pointer with a 200 msc response time with an approximate range of 20 feet with a temperature range of −50 C (−58 F) to 950 C (1742 F) with a temperature resolution of 1 degree C. (1.8 degree F.).2. The device has 2 stepper motors which allow the first motor to operate at a 360 Degree functionality with the second motor operating at a 90 Degree functionality therefore allowing a full movement for the laser sensor to point in any location within the refrigeration unit.3. The device uses a separate control box mounted outside the refrigeration unit which is programmable to numerous settings:A. The multi-point pyrometer which is used to set the 6 or more positions the laser sensor will use to pin point food temperatures every 30 to 45 minutes.B. The system set up which begins the programming process.C. The Scan Programming procedure is the time standard setting.D. The system enabled display to indicate the system is ready to begin the process. There is no federally sponsored or research or development associated with this application.There is no joint research agreement associated with this application.(1) Field of the InventionThe field of the invention has to do with the energy savings from ...

TRANSPORT REFRIGERATION SYSTEM HAVING ELECTRIC FANS

A transport refrigeration system having one or more compressors forming part of a refrigeration circuit for cooling an interior compartment of a container or refrigerated trailer; and one or more fans powered by direct current (DC) power, the one or more fans being at least one of an evaporator fan, a condenser fan and a ventilation fan. 1. A transport refrigeration system comprising:one or more compressors forming part of a refrigeration circuit for cooling an interior compartment of a container or refrigerated trailer; andone or more fans powered by direct current (DC) power, the one or more fans being at least one of an evaporator fan, a condenser fan and a ventilation fan.2. The transport refrigeration system of further comprising:an engine; andan alternator driven by the engine, the alternator providing the DC power to the one or more fans.3. The transport refrigeration system of wherein:the engine directly drives the compressor through a mechanical coupling.4. The transport refrigeration system of further comprising:an AC or DC generator driven by the engine;the AC or DC generator providing AC or DC power to the compressor.5. The transport refrigeration system of further comprising:a battery, the battery providing DC power to the one or more fans.6. The transport refrigeration system of further comprising:an engine; andan alternator driven by the engine, the alternator providing the DC power to the one or more fans and the alternator charging the battery.7. The transport refrigeration system of further comprising:a controller monitoring voltage at the battery, the controller starting the engine when the voltage at the battery drops below a threshold.8. The transport refrigeration system of further comprising:an auxiliary power source, the auxiliary power source providing DC power to charge the battery.9. The transport refrigeration system of wherein:the container is part of a trailer, the auxiliary power source being mounted to the trailer.10. The transport ...

VEHICLE AIR-CONDITIONING DEVICE

A vehicle air-conditioning device includes a blower which blows air to a vehicle cabin through blowout openings, a refrigeration circuit through which refrigerant is circulated by an electric compressor, an interior heat exchanger disposed in the refrigeration circuit and exchanging heat between the refrigerant and a blown air, which is air that is blown by the blower, an interior/exterior air adjustment device adjusting a ratio of interior air and exterior air contained in the blown air, and a first blowing control portion controlling the electric compressor to stop, controlling the blower to operate, and controlling the interior/exterior air adjustment device such that air that is blown into the vehicle cabin includes at least exterior air, when a temperature difference between a target temperature Tao of air that is blown through the blowout opening and an exterior air temperature Tam is less than a predetermined value. In this case, when the temperature Tao is close to the temperature Tam, the electric compressor is stopped and air including exterior air is blown by the blower. Thus, a reduction in electric-power consumption can be achieved and a temperature of the air can get closer to Tao. 1. A vehicle air-conditioning device comprising:a blower blowing air into a vehicle cabin through blowout openings;a refrigeration circuit through which refrigerant is circulated by an electric compressor;an interior heat exchanger disposed in the refrigeration circuit and exchanging heat between the refrigerant and a blown air, which is air that is blown by the blower;an interior/exterior air adjustment device adjusting a ratio of interior air and exterior air contained within the blown air; anda first blowing control portion controlling the electric compressor to stop, controlling the blower to operate, and controlling the interior/exterior air adjustment device such that air that is blown into the vehicle cabin includes at least exterior air, when a temperature difference ...

REFRIGERATION SYSTEM AND COOLING METHOD OF ELECTRONIC CONTROL UNIT THEREOF

A refrigeration system, including: an electronic control unit, including a housing and an electronic device arranged in the housing; a refrigeration loop, including a compressor, a condenser, a primary throttling element, and an evaporator sequentially connected through a pipeline and forming a closed loop; and an electronic device cooling branch connected into the refrigeration loop from the condenser, and connected back to the refrigeration loop from the evaporator; the electronic device cooling branch including an electronic device cooling unit, a secondary throttling element, and an electromagnetic valve; and the electronic device cooling unit being arranged in the housing and spaced apart from the electronic device, for reducing the temperature and humidity of the electronic device and an environment in the housing. 1. A refrigeration system , including:an electronic control unit, including a housing and an electronic device arranged in the housing;a refrigeration loop, including a compressor, a condenser, a primary throttling element, and an evaporator sequentially connected through a pipeline and forming a closed loop; andan electronic device cooling branch connected into the refrigeration loop from the condenser, and connected back to the refrigeration loop from the evaporator; the electronic device cooling branch including an electronic device cooling unit, a secondary throttling element, and an electromagnetic valve; and the electronic device cooling unit being arranged in the housing and spaced apart from the electronic device, for reducing the temperature and humidity of the electronic device and an environment in the housing.2. The refrigeration system according to claim 1 , wherein the electronic device cooling unit includes an air-refrigerant heat exchanger and a fan that provides forced air convection claim 1 , wherein the air-refrigerant heat exchanger is connected in parallel to the primary throttling element.3. The refrigeration system according ...

TURBO REFRIGERATOR

A turbo refrigerator includes a centrifugal compressor configured to compress a refrigerant by rotation of an impeller having a plurality of blades, a condenser configured to cool the compressed refrigerant, a first expansion valve and a second expansion valve connected in series and configured to decompress the refrigerant from the condenser to form two phases of a gas and a liquid, an evaporator configured to evaporate the refrigerant from the second expansion valve, an economizer disposed between the first expansion valve and the second expansion valve and configured to separate the refrigerant into two phases of a gas and a liquid, and an introduction path configured to allow the gas phase separated from the refrigerant in the economizer to flow between a front edge and a rear edge of a blade in a main flow channel between the neighboring blades of the impeller. 1. A turbo refrigerator comprising:a centrifugal compressor configured to compress a refrigerant by rotation of an impeller having a plurality of blades;a condenser configured to cool the compressed refrigerant;a plurality of decompressors configured to decompress the refrigerant from the condenser to form two phases of a gas and a liquid and connected to each other in series in a number greater than the number of stages of the centrifugal compressor;an evaporator configured to evaporate the refrigerant passing through the plurality of decompressors;gas-liquid separators disposed between the decompressors and configured to separate the refrigerant into the two phases of the gas and the liquid; andan introduction path configured to cause the gas phase separated from the refrigerant to flow between a front edge and a rear edge between the neighboring blades in at least one of the gas-liquid separators.2. The turbo refrigerator according to claim 1 , wherein the introduction path allows the gas phase to flow closer to the front edge side than an intermediate section between the front edge and the rear edge ...

HVAC SYSTEM CONFIGURED TO OBTAIN DEMAND SPECIFIC DATA FROM A REMOTE UNIT THEREOF

An HVAC system that obtains demand specific data from an outdoor unit thereof is provided. An indoor unit controller, an outdoor unit controller and an outdoor unit of the HVAC system are also disclosed. In one embodiment, the outdoor unit controller includes: (1) an interface configured to receive a request for a second portion of demand data from an indoor controller of the HVAC system, wherein the request includes a first portion of the demand data that corresponds to the second portion and (2) a processor configured to respond to the request by determining the second portion based on the first portion and sending the second portion of the demand data to the indoor controller of the HVAC system. 1. A controller for a multispeed outdoor unit of a heating , ventilating and air conditioning (HVAC) system , comprising:an interface configured to receive a request for a second portion of demand data from an indoor controller of said HVAC system, wherein said request includes a first portion of said demand data that corresponds to said second portion; anda processor configured to respond to said request by determining said second portion based on said first portion and sending said second portion of said demand data to said indoor controller of said HVAC system.2. The controller as recited in wherein said first portion is an operating speed of said compressor that corresponds to a thermostat call of said HVAC system and said second portion is a blower volume for said circulating fan that corresponds to said operating speed for said compressor.3. The controller as recited in wherein said first portion is a blower volume for said circulating fan that corresponds to a thermostat call of said HVAC system and said second portion is an operating speed of said compressor that corresponds to said blower volume.4. The controller as recited in further comprising a memory having stored thereon said demand data claim 1 , wherein said processor employees said first portion to ...

REFRIGERATING CONTROL DEVICE FOR AIR CONDITIONER

A refrigerating control device of the invention for an air conditioner includes a control circuit connected to a compressor of the air conditioner through an electromagnetic switch including a control coil and a contact-switch element including a plurality of input contacts and a plurality of output contacts connected to the compressor and a motor of the compressor, wherein the control circuit includes a timing circuit connected to the control coil through an interval timing device and a soft start circuit connected to the input contacts. 1. A refrigerating control device for an air conditioner comprising a compressor comprising a motor , comprising a control circuit connected to the compressor through an electromagnetic switch comprising a control coil and a contact-switch element comprising a plurality of input contacts and a plurality of output contacts connected to the compressor and the motor , wherein the control circuit comprises a timing circuit connected to the control coil through an interval timing device and a soft start circuit connected to the input contacts.2. The refrigerating control device as claimed in claim 1 , wherein the interval timing device is set to have continuous and alternate operation time and rest time.3. The refrigerating control device as claimed in claim 1 , wherein the timing circuit is adjustable.4. The refrigerating control device as claimed in claim 2 , wherein the operation time and the rest time are adjustable.5. The refrigerating control device as claimed in claim 1 , wherein the timing circuit and the soft start circuit are modular. The invention relates to a refrigerating control device for an air conditioner to reduce energy consumption.An operation principle of a conventional air conditioner is shown in . A control circuit control a compressor through an electromagnetic switch to compress refrigerant to become high-pressure liquid state. The liquid refrigerant is cooled by a condenser and released to an evaporator through ...

CONTROLLER AND METHOD FOR MANAGING ECONOMIZER OUTPUTS

There are disclosed controllers and methods for managing economizer outputs. The economizer controller comprises an input component, a processor, and an output component. The input component receives incoming control signals from an input device, in which each incoming control signal is associated with a corresponding compressor. The processor generates an altered association of some of the incoming control signals to a different compressor based on a predetermined criteria. The output component sends output control signals based on the altered association to a control circuit associated with the compressors. 1. A controller for managing of economizer outputs comprising:an input component configured to receive a plurality of incoming control signals from an input device, each incoming control signal of the plurality of incoming control signals being associated with a corresponding compressor of a plurality of compressors;a processor configured to generate an altered association of at least some of the plurality of incoming control signals to a different compressor of the plurality of compressors based on a predetermined criteria; andan output component configured to send a plurality of output control signals based on the altered association to a control circuit associated with the plurality of compressors.2. The controller as described in claim 1 , wherein the input device is a thermostat and the control circuit is a terminal board of an HVAC unit or rooftop unit.3. The controller as described in claim 1 , wherein the compressor is at least one of a compressor for cooling and a compressor for heating.4. The controller as described in claim 1 , wherein the predetermined criteria includes at least one of a run time count or a cycle count for the plurality of compressors.5. The controller as described in claim 1 , wherein the processor updates at least one of run time counter or cycle counter in response to the output component sending the plurality of output control ...

SYSTEM AND METHOD FOR CONTROLLING A COOLING SYSTEM

Cooling systems and methods of controlling a cooling system which includes one or more pumps and one or more fans, wherein the pumps and the fans are controlled by a controller. The controller controls the cooling system by a determination of an operation of the cooling system for sequencing activations, deactivations, and/or controlling parameters of the pumps, the fans, and/or other component(s) of the cooling system based on a first sensitivity of a power input as a function of lift, and a second sensitivity of a power input as a function of lift. 121-. (canceled)22. A computer-implemented method for controlling a chiller plant with a controller device , comprising:the controller device setting a power input control scheme for one or more component(s) of the chiller plant by determining an amount of power needed by the one or more component(s) of the chiller plant at a chiller load;the controller device setting a scale based on the amount of power used by the one or more component(s) of the chiller plant at the chiller load; andthe controller device setting power setpoints for each of the one or more component(s) based on the scale.23. The computer-implemented method according to claim 22 , wherein the one or more component(s) of the chiller pant include one or more pumps claim 22 ,the controller device setting the power input control scheme further comprises the controller device determining a sensitivity of a power value of the one or more pumps to a change in system temperature; andthe controller device balancing the scale to the sensitivity.24. The computer-implemented method according to claim 22 , wherein the one or more component(s) of the chiller pant include one or more fans claim 22 ,the controller device setting the power input control scheme further comprises determining a sensitivity of a power value of the one or more fans to a change in system temperature; andthe controller device balancing the scale to the sensitivity.25. The computer-implemented ...