ХОЛОДИЛЬНАЯ УСТАНОВКА С РЕГУЛЯТОРОМ ДАВЛЕНИЯ

Холодильная установка содержит компрессор, конденсатор, регулирующий вентиль и теплообменник. Последний содержит сосуд для холодильного агента, содержащий внутреннее пространство, ограниченное замкнутой поверхностью стенок сосуда, а также содержащий впускной патрубок и выпускной патрубок для транспортировки холодильного агента во внутреннее пространство и наружу через стенку сосуда. В указанном внутреннем пространстве по меньшей мере частично размещена трубка, при этом первый конец указанной трубки закреплен в первом отверстии в стенке сосуда и второй конец указанной трубки закреплен во втором отверстии стенки сосуда для обеспечения переноса жидкости в указанную трубку и/или из нее через первое отверстие и второе отверстие. При этом блок управления давлением контролирует давление во внутреннем пространстве на основании целевой температуры. 2 н. и 12 з.п. ф-лы, 11 ил., 1 табл.

КОНДИЦИОНЕР

Описан кондиционер, в котором нагретый воздух в начале нагревания воздуха может быстро подаваться при помощи простой конфигурации. Кондиционер (1) включает в себя, по меньшей мере, компрессионный механизм (21), внутренний теплообменник (41), внутренний вентилятор (42), наружный электрический расширительный клапан (24) и наружный теплообменник (23), в котором датчик (29а) давления определяет давление хладагента, проходящего из компрессионного механизма (21) во внутренний теплообменник (41). Блок (11) управления останавливает внутренний вентилятор (42) до тех пор, пока компрессионный механизм (21) не перейдет из состояния покоя в запуск, и давление, определяемое датчиком (29а) давления, не достигнет целевого высокого давления (Ph), и с момента времени, когда целевое высокое давление (Ph) превышено, блок (11) управления осуществляет управление для приведения в действие и остановки внутреннего вентилятора (42), так что состояние высокого давления поддерживается. 9 з.п. ф-лы, 33 ил.

Digitaler Kühlmitteldruckmesser

Refrigerant circulating apparatus, e.g. for air conditioning system, has expansion valve opening controlled to adjust refrigerant pressure and prevent overheating after start-up

In refrigerant (RF) circulation apparatus, in which RF is compressed (1), cooled (2), decompressed through an expansion valve (4), evaporated (5) and recompressed, valve opening is controlled (10) so that the high pressure side RF pressure is at a first or second theoretical value (P1, P2), P1 being the optimum value. After starting the compressor, the pressure is set to P2 (lower than P1) for a specific time (t1), after which pressure is adjusted to P1. In refrigerant (RF) circulation apparatus, in which RF is compressed (1) above a critical pressure, cooled (2), decompressed through an expansion valve (4), evaporated (5) and returned to the compressor, the degree of opening of the valve is controlled (10) such that the RF pressure on the high pressure (pre-decompression) side is at a first or second theoretical value (P1, P2). P1 is the optimum value based on the temperature of RF flowing from the cooler. After starting the compressor, the pressure is set at P2 (lower than P1) for a predetermined ...

Klimaanlage mit überkritischem Kältemittel für Fahrzeugkarosserien

Kältekreislauf

Constant temperature liquid circulating device with pressure control

A constant temperature liquid circulating device 10 having a conduit 12 for delivering a temperature controlled constant temperature circulating liquid from a pump 13 is used with an external device 20 connected thereto to form a circulating flow channel. The pressure of the circulating liquid in piping 23 of the external device is controlled so as not to exceed a preset maximum pressure value to protect the piping in the external device. One or more pressure sensors 18 monitor the pressure in the flow channel at points where excessive pressure should be avoided and pressure signals are sent to a controller 15. Pressure control may be by adjusting pump output via an inverter 16 or by bypassing the external device with a three way valve or throttling the input to the external device with a proportional valve.

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. ...

Air-conditioning apparatus

Air-conditioning apparatus

Refrigeration cycle device

Cooling system with pressure control

A cooling system comprises a compressor, a condenser, an expansion valve, and a heat exchanger. The latter comprises a vessel for containing a refrigerant, the vessel having an inner space bounded by a closed surface of a vessel wall, the vessel comprising an inlet and an outlet for transport of refrigerant into and out of the inner space through the vessel wall. A tube is disposed at least partly inside the inner space, wherein a first end of the tube is fixed to a first orifice of the vessel wall and a second end of the tube is fixed to a second orifice of the vessel wall to enable fluid communication into and/or out of the tube through the first orifice and the second orifice. A pressure control means controls a pressure in the inner space based on a target temperature.

Cooling system with pressure control

A cooling system comprises a compressor, a condenser, an expansion valve, and a heat exchanger. The latter comprises a vessel for containing a refrigerant, the vessel having an inner space bounded by a closed surface of a vessel wall, the vessel comprising an inlet and an outlet for transport of refrigerant into and out of the inner space through the vessel wall. A tube is disposed at least partly inside the inner space, wherein a first end of the tube is fixed to a first orifice of the vessel wall and a second end of the tube is fixed to a second orifice of the vessel wall to enable fluid communication into and/or out of the tube through the first orifice and the second orifice. A pressure control means controls a pressure in the inner space based on a target temperature.

REFRIGERATION SYSTEM WITH TRANSFER SYSTEM

APPARATUS AND METHOD FOR HYBRID WATER HEATING AND AIR COOLING AND CONTROL THEREOF

A system for conditioning air circulated from an interior of a building includes a refrigerant path, an air-cooled condenser in the refrigerant path, a water-cooled condenser in the refrigerant path that transfers heat from refrigerant in the refrigerant path to the building water, an evaporator in the refrigerant path, and a control system. The control system moves the system between operation of the air-cooled condenser and the water-cooled condenser based upon predetermined system conditions.

CARBON DIOXIDE COOLING SYSTEM WITH SUBCOOLING

A subcooling controller includes a sensor and a processor. The sensor measures one or more of a temperature external to a first heat exchanger that removes heat from carbon dioxide refrigerant, a temperature of the carbon dioxide refrigerant, and a pressure of the carbon dioxide refrigerant. The processor determines that one or more of the measured temperature external to the first heat exchanger, the temperature of the carbon dioxide refrigerant, and the pressure of the carbon dioxide refrigerant is above a threshold and in response to that determination, activates a subcooling system. The subcooling system includes a condenser, a second heat exchanger, and a compressor. The condenser removes heat from a second refrigerant. The second heat removes heat from the carbon dioxide refrigerant stored in a flash tank. The compressor compresses the second refrigerant from the second heat exchanger and sends the second refrigerant to the condenser.

HOSE FREE SENSOR SYSTEM FOR REFRIGERANT UNIT

A hoseless sensor system for a refrigerant unit includes a plurality of hoseless sensors for sensing system parameters of the refrigerant unit, and a portable electronic device configured to receive the system parameters from the hoseless sensors and to calculate system conditions for the refrigerant based on the system parameters. The plurality of hoseless sensors includes a hoseless first pressure sensor and a hoseless second pressure sensor, and a hoseless first temperature sensor and a hoseless second temperature sensor. The temperature sensors may be temperature sensor clamps. Each temperature sensor clamp includes a clamping portion configured to clamp on a tube of the refrigerant unit, the clamping portion including a sensor element to measure temperature about the tube. The clamping portion further includes a plurality of clamping teeth, and adjacent clamping teeth interlock in an overlapping configuration when the clamp closes inward beyond a threshold point.

APPARATUS AND METHOD FOR HYBRID WATER HEATING AND AIR COOLING AND CONTROL THEREOF

A system for conditioning air circulated from an interior of a building includes a refrigerant path, an air-cooled condenser in the refrigerant path, a water-cooled condenser in the refrigerant path that transfers heat from refrigerant in the refrigerant path to the building water, an evaporator in the refrigerant path, and a control system. The control system moves the system between operation of the air-cooled condenser and the water-cooled condenser based upon predetermined system conditions.

Flue gas type lithium bromide absorption cryogen water chilling unit with online density detecting function

Constant temperature liquid circulating device with external tubing protecting device

Cryostat

Transport refrigeration system for refrigerant distribution device and method

The refrigerant cooling and lubricating system

냉장고 및 그 제상방법

... 본 발명에 따른 냉장고는 식품을 보관하기 위한 저장공간을 형성하는 캐비닛, 저장공간에 구비되어 냉기를 발생시키는 증발기, 증발기의 양측을 각각 지지하며 증발기를 캐비닛의 내벽에 고정시키기 위한 한 쌍의 브라켓, 브라켓 각각에 설치되며 증발기에 착상된 성에로 인한 브라켓의 변형량을 측정하기 위한 한 쌍의 센서, 및 증발기에 인접하여 설치되고 증발기와의 열교환을 통해 증발기에 착상된 성에를 제거하는 제상히터를 포함한다.

선박용 냉동장치

... 본 발명은, 수랭식 응축기를 구비한 선박용 냉동장치에 있어서, 냉각관에 구멍이 생긴 경우라도 냉매회로의 구성부품 파손을 방지하는 것이다. 선박에 탑재되어, 압축기구(30)와 수랭식 응축기(40)와 팽창기구(50)와 증발기(60)가 순차 접속된 냉매회로(20)를 구비한 공기 조화장치(10)에, 수랭식 응축기(40)에 있어서, 냉매실(S1)의 냉매가 냉각관(42) 내로 누설되는 이상(異常) 상태인지 여부를 판정하는 이상 판정부(81)와, 이 이상 판정부(81)가 이상 상태라고 판정하면, 냉각관(42)으로부터 냉매회로(20)로의 냉각수 침입을 회피하기 위한 소정의 이상 시 동작을 행하는 이상 시 동작부(82)를 구비한다.

SUPERCRITICAL PRESSURE REGULATION OF ECONOMIZED REFRIGERATION SYSTEM

Refrigerant is circulated through an economized refrigeration system including a compressor (22), a gas cooler (24), a main expansion device (26), an economizer heat exchanger (30) and an evaporator (28). After cooling, the refrigerant splits into an economizer flow path (34) and a main flow path (32). Refrigerant in the economizer flow path (34) is expanded to a low pressure and exchanges heat with the refrigerant in the main flow path in the economizer heat exchanger (30). The refrigerant in the main flow path (32) is then expanded and heated in the evaporator (28) and enters the compressor (22), completing the cycle. An accumulator (44) positioned between the economizer heat exchanger (30) and the compressor (22) stores excess refrigerant in the system, regulating the amount of refrigerant in the system and the high pressure in the system. The amount of refrigerant in the accumulator (44) is controlled by regulating the economizer expansion device (36). By adjusting the amount of refrigerant ...

TRANSPORT REFRIGERATION SYSTEM AND METHOD OF OPERATION

A refrigerant vapor compression system using CO2 as the working fluid and operating in a transcritical cycle, compression of the refrigerant is accomplished by use of a digital scroll compressor adapted to a variable duty cycle in a pulse width modulation manner. The compression ratio is maintained at an acceptable level by selective control of various components within the system, depending on the mode of operation.

Compressor head, internal discriminator, external discriminator, manifold design for refrigerant recovery apparatus and vacuum sensor

The compressor head, internal and/or external discriminator, and manifold design in general utilize ball valves on the suction and discharge of a cylinder head in the recovery of refrigerant liquid and/or vapor. The device facilitates the flashing of liquid refrigerant pumped to the compressor which, in turn, assists to cool the compressor head. The flashing of liquid refrigerant to vapor also deters liquid transfer into the compressor enhancing performance thereof. The vapor passages within the discriminator, cylinder head and/or manifold are sized for receipt of spring actuated ball's to open and/or close the vapor passages during suction and/or discharge of refrigerant vapor or liquid by the compressor.

Discharge pressure control system for transport refrigeration unit using suction modulation

A compressor discharge pressure control system employed on a container refrigeration unit utilizes a pressure transducer located in the high pressure side of the system and a data processor to control and limit the compressor discharge pressure to a maximum value when the normal condenser pressure controls are inactive. The pressure control system operates the suction modulation valve in a manner that significantly reduces compressor cycling and increases refrigeration system capacity during pull-down periods. The pressure control system also operates during water-cooled operation of a refrigeration system having a water-cooled condenser thereby eliminating the need to provide a water pressure switch in the refrigeration system.

Vehicle air conditioning system comprising a refrigerant recovery vessel

CONTROL SYSTEM AND METHOD FOR OPERATING A COOLING SYSTEM

REFRIGERANT VAPOR COMPRESSION SYSTEM WITH FLASH TANK RECEIVER

AIR CONDITIONING SYSTEMS AND METHODS HAVING FREE-COOLING PUMP-PROTECTION SEQUENCES

Vapor line pressure control

In a heat pump system designed for use with a relatively low pressure refrigerant, provision is made , by use of a vapor pressure control system, to use a higher pressure refrigerant without replacement of the indoor coil and the line set. The vapor pressure is sensed during periods of heat pump operation, and when the pressure reaches a predetermined maximum threshold level, the outdoor fan speed is reduced to thereby cause the vapor pressure to be reduced. When the vapor pressure is reduced to a predetermined minimum threshold level, then the fan speed is resumed so as thereby allow the vapor pressure to again be increased.

SUPERCRITICAL REFRIGERATING CYCLE

PROBLEM TO BE SOLVED: To properly carry out cooling fan control of a high pressure side radiator in a supercritical refrigerating cycle. SOLUTION: The supercritical refrigerating cycle is provided with the radiator 2 cooling a discharged refrigerant of a compressor 1, a cooling fan 2a sending outside air to the radiator 2, a pressure reducing means 4 for reducing a pressure of an outlet side refrigerant of the radiator 2, and controlling an opening such that a high pressure becomes a target pressure, and an evaporator 5 evaporating a low pressure refrigerant reduced in pressure by the pressure reducing means 4. The high pressure becomes a critical pressure or more of the refrigerant. An information value is calculated indicating a difference between an actual heat dissipation state of the outlet side refrigerant of the radiator 2, and an ideal heat dissipation state determined by an outside air temperature, and an air amount of the cooling fan is controlled on the basis of the information ...

Servicegerät für Klimaanlagen

Drucksteuerung einer Dampfleitung

Liquid refrigerant powered turbine

A liquid line pressure reducing device 2, such as a turbine, has a rotating power output shaft driving an electric generator 3, together with a control system that controls the pressure of the liquid on the downstream side of the pressure reducing device to prevent the downstream liquid flashing off into saturated vapour. The power of the output shaft may be absorbed by a means other than an electric generator. Preferably, the control system also controls the flash off of liquid in the intake tract of a saturated vapour expander. The control of the pressure drop through the pressure reducing device, so as to prevent liquid flash off, may be achieved by controlling the speed of the pressure reducing device, or for a turbine, by utilising variable expeller inlet guide blades. Preferably, the generator speed is controlled by pressure and temperature sensors 4, 5 located immediately downstream of the pressure reducing device which, via computer software logic, sense the approach of the (refrigerant ...

Constant temperature liquid circulating device

VEHICLE AIR CONDITIONING SYSTEM WITH A RECEPTACLE FOR THE REFRIGERANT

PROCEDURE AND DEVICE FOR THE REGULATION OF A REFRIGERANT CYCLE OF AN AIR CONDITIONING SYSTEM FOR A VEHICLE

Compact refrigeration system

Refrigeration system utilizing a jet enthalpy compressor for elevating the suction line pressure

Heat exchanger

A vessel for containing a refrigerant comprising an inner wall and an outer wall arranged concentrically and having an inner space bounded by the inner wall and outer wall, an inlet and an outlet for transport of refrigerant into and out of the inner space; a tube inside the inner space arranged turn around the inner wall; an input tube fluidly connected to the inner space and arranged to allow flow of the refrigerant through the input tube into the inner space; an output tube connected to the inner space and arranged to allow flow of the refrigerant out of the inner space into the output tube; a compressor arranged to receive the refrigerant from the output tube and to compress the refrigerant; and a condenser arranged to receive the compressed refrigerant fluid from the compressor, to condense the refrigerant, and to forward the compressed refrigerant into the input tube.

COOLING SYSTEM WITH PRESSURE CONTROL

For water chilling unit system of the purification system

PROCESS OF CALCULATION AND REGULATION OF the CONCENTRATION OF FLUID ABSORBING IN a DEVICE OF AIR-CONDITIONING BY ABSORPTION, AND DEVICE OF AIR-CONDITIONING BY ABSORPTION FOR the IMPLEMENTATION Of SUCH a PROCESS

NONPOWERED CIRCULATION SIPHON

The present invention relates to a nonpowered circulation siphon. Especially, the siphon of the present invention comprises: a coolant tube (30) connecting an exit of an evaporator (10) and an entrance of a condenser (20) and having a swing check valve (31) installed therein, wherein the swing check valve allows a gas coolant to pass to a side of the condenser (20) when a pressure difference is greater than or equal to a predetermined pressure; and a coolant tube (40) connecting an exit of the condenser (20) and an entrance of the evaporator (10) and having a ball check valve (41), allowing a liquid coolant to pass to a side of the evaporator (10) when a pressure difference is greater than the predetermined pressure, installed therein and a flow control means for obtaining a mixing and throttling reaction effect of the coolant installed on the coolant tube (40) between an exit of the ball check valve (41) and the entrance of the evaporator (10). Accordingly, the present invention is able ...

REFRIGERATION DEVICE

Provided is a refrigeration device which can, independently of outside air temperature, ensure stable refrigeration performance when the high-pressure side has a supercritical pressure, and which can improve cost and the easiness of construction. A refrigeration device is provided with: a pressure regulating throttle means which is connected to a refrigerant circuit which is located downstream of a gas cooler and upstream of a main throttle means; a decompression tank which is connected to a refrigerant circuit which is located downstream of the pressure regulating throttle means and upstream of the main throttle means; a split heat exchanger which is provided in a refrigerant circuit which is located downstream of the decompression tank and upstream of the main throttle means; an auxiliary circuit which allows a refrigerant within the decompression tank to be sucked into the intermediate pressure section of a compressor after causing the refrigerant to flow to a first flow passage in the ...

Intelligent controller for refrigerating and air conditioning systems

An intelligent controller (68), adapted for regulating operation of either a refrigeration system or an air conditioning system (20), receives an output electrical signal produced by a pressure sensor (72, 74, 76, 78) included in the system (20). Responsive to the received electrical signal, the intelligent controller (68) energizes operation of a motor (24) that drives a compressor (22) included in the system (20). The programmable electronic circuit (68) performs a calibration operation in which the circuit (68) measures the output electrical signal received from the pressure sensor (72, 74, 76, 78) and stores as an offset the value so measured. The programmable electronic circuit (68) subsequently applies the stored offset for adjusting a value of the output electrical signal received from the pressure sensor (72, 74, 76, 78) during normal operation of the system (20).

Control System and Method for Operating a Cooling System

The present invention relates to a control system for operating a cooling system comprising components at least including a compressor (2), an evaporator (3), a pressure control element (6) and a condenser the (4), and also having a control circuit (9) having electrical connections with at least some cooling system components, through which the control circuit (9) continually measures and stores, over time intervals, electrical operating variables of the cooling system, the control circuit establishes interrelationships among at least some measured values and some stored values of the electrical operating variables of the cooling system and generates a control signal for the cooling system based on at least some measured values and stored values of the electrical operating variables and on the interrelationships established among at least some measured and stored values of the electrical operating variables of the cooling system.

A METHOD TO OPERATE A REFRIGERANT RECOVERY AND RECHARGE DEVICE

ТЕПЛООБМЕННИК

Раскрыт сосуд для размещения холодильного агента, содержащий внутреннюю стенку и внешнюю стенку, выполненные концентрическими и образующие внутреннее пространство, ограниченное внутренней стенкой и внешней стенкой; впускной патрубок и выпускной патрубок для транспортировки холодильного агента в указанное внутреннее пространство и из него; трубку в указанном внутреннем пространстве, совершающую витки вокруг внутренней стенки; впускную трубку, соединенную с возможностью перетекания жидкости с указанным внутренним пространством и выполненную с возможностью протекания холодильного агента через указанную впускную трубку во внутреннее пространство; выпускную трубку, соединенную с возможностью перетекания жидкости с указанным внутренним пространством и выполненную с возможностью протекания холодильного агента из внутреннего пространства в указанную выпускную трубку; компрессор (527), смонтированный для получения холодильного агента из указанной выпускной трубки и сжатия холодильного агента; и ...

АГРЕГАТИРОВАННАЯ АММИАЧНАЯ ХОЛОДИЛЬНАЯ УСТАНОВКА С ИСПАРИТЕЛЬНЫМ КОНДЕНСАТОРОМ, ЗАРЯЖАЕМАЯ НЕБОЛЬШИМ КОЛИЧЕСТВОМ ХЛАДАГЕНТА

ХОЛОДИЛЬНАЯ УСТАНОВКА

Холодильная установка для циркуляции в ней хладагента во время операции нагревания в порядке очередности через компрессор, первый теплообменник, расширительный вентиль и второй теплообменник. Первый вентиль присоединен между компрессором и первым теплообменником. Второй вентиль присоединен между первым теплообменником и расширительным вентилем. Контроллер выполнен с возможностью закрытия первого и второго вентилей, когда выполнено условие окончания операции нагревания. При этом, когда выполнено условие начала операции нагревания, контроллер выполнен с возможностью инициирования подачи хладагента от компрессора к первому вентилю и затем открытия первого и второго вентилей, при условии, что первая теплообменная способность первого теплообменника выше, чем вторая теплообменная способность второго теплообменника, и открытия первого и второго вентилей и затем подачи хладагента от компрессора к первому вентилю, когда это условие не выполнено. 4 з.п. ф-лы, 21 ил.

Regelung von parallel betriebenen kryogenen Kälteanlagen

Die Erfindung betrifft ein Verfahren zur Regelung einer ersten und einer zweiten Kälteanlage (1, 2), die über einen Kühlkreislauf (100) verbunden sind, wobei eine geforderte Gesamtkühlleistung durch eine Kühlleistung der ersten Kälteanlage (1) und eine Kühlleistung der zweiten Kälteanlage (2) bereitgestellt wird, wobei, wenn die geforderte Gesamtkühlleistung größer als eine Mindestlast ist, nur die Kühlleistung der zweiten Kälteanlage (2) zur Einstellung der geforderten Gesamtkühlleistung geregelt wird und die erste Kälteanlage auf Nennleistung läuft.

Verdichtungsdrucksteuerung für Transportkälteanlage mit Saugdruckregulierung

Fahrzeugklimaanlage mit einem Auffangbehälter für das Kältemittel

Apparatus and Method for Controlling a Cryogenic Cooling System

Apparatus for controlling a cryogenic cooling system comprising a supply gas line and a return gas line 3A, 3B coupled to a compressor 1 and to a mechanical refrigerator 2 via a coupling element 4. The coupling element is in gaseous communication with the supply and return gas lines and supplies gas to the mechanical refrigerator. The pressure of the supplied gas is modulated by the coupling element in a cyclical manner. A pressure sensing apparatus 6 monitors the pressure in at least one of the supply and return gas lines. A control system 5 is used to modulate the frequency of the cyclical gas pressure supplied by the coupling element in accordance with the pressure monitored by the pressure sensing apparatus. Preferably the coupling element is a rotary valve driven by a motor and the motor is controlled by the controlling system. The system may also include a temperature sensor.

REGULATION OF SUPERCRITICAL PRESSURES IN A REFRIGERANT CYCLE WITH ECONOMISER

HEAT PUMP

Air conditioning device

An air conditioning device which can, when the heating is started, quickly provide warm air using a simple configuration. An air conditioning device (1) including at least a compressor (21), an indoor heat exchanger (41), an indoor fan (42), an outdoor electric expansion valve (24), and an outdoor heat exchanger (23), wherein a pressure sensor (29a) understands the pressure of a refrigerant sent from the compressor (21) toward the indoor heat exchanger (41). A control section (11) keeps the indoor fan (42) in a stopped state from a time at which the compressor (21) is not started to a time after the compressor (21) is started and before the pressure which the pressure sensor (29a) understands exceeds a target high pressure (Ph), and in a period after the target high pressure (Ph) is exceeded, the control section (11) drives or stops the indoor fan (42) so that the high-pressure state is maintained.

SYSTEM FOR WARMING-UP AND COOLING-DOWN A SUPERCONDUCTING MAGNET

A cryogenic refrigerator system with heaters is constructed in modular form to serve as a portable servicing system to warm up and then cool down a target object by circulating a gaseous cryogen through a target object cryostat without moving the target object or breaking its vacuum. The main module is a refrigerator cryostat containing a fan that circulates gas through one or more heat exchangers which can warm or cool the gas by heaters and by one or more GM or Brayton cycle expanders. Additional components including one or more compressors, a gas charge and vent assembly, a control system, gas lines, power lines, and vacuum jacketed transfer lines can be assembled in the main module or additional modules. An example is a system that can be wheeled through a hospital to service a MRI cryostat.

SYSTEMS AND METHODS FOR PUMPING DOWN FLAMMABLE REFRIGERANT

In one embodiment, an HVAC system includes an indoor unit having a furnace, an outdoor heat pump unit having a compressor and an outdoor coil, a refrigerant line coupled to the indoor unit and the outdoor heat pump unit, and an EEV coupled to the refrigerant line. The HVAC system further includes one or more controllers operable to determine an occurrence of a first event, initiate a closure of the EEV, initiate operation of the compressor at a completion of the air conditioning cycle to pump down a refrigerant to the outdoor coil, and cease operation of the compressor when a low-pressure switch is tripped.

LOW CHARGE PACKAGED AMMONIA REFRIGERATION SYSTEM WITH EVAPORATIVE CONDENSER

A packaged, pumped liquid, evaporative-condensing recirculating ammonia refrigeration system with charges of 10 lbs or less of refrigerant per ton of refrigeration capacity. The compressor and related components are situated inside the plenum of a standard evaporative condenser unit, and the evaporator is close coupled to the evaporative condenser. Prior art large receiver vessels may be replaced with a single or dual phase cyclonic separator also housed in the plenum of the evaporative condenser.

A METHOD FOR CONTROLLING A VAPOUR COMPRESSION SYSTEM IN EJECTOR MODE FOR A PROLONGED TIME

A method for controlling a vapour compression system (1) comprising an ejector (6) is disclosed. In the case that a pressure difference between a pressure prevailing in the receiver (7) and a pressure of refrigerant leaving the evaporator (9) decreases below a first lower threshold value, the pressure of refrigerant leaving the heat rejecting heat exchanger (5) is kept at a level which is slightly higher than the pressure level providing optimal COP. Thereby the ejector (6) can operate at lower ambient temperatures, and the energy efficiency of the vapour compression system (1) is improved.

REFRIGERATION SYSTEM UTILIZING AN EXPANSION JET COMPRESSOR

REFRIGERATION SYSTEM UTILIZING AN EXPANSION JET COMPRESSOR A closed loop vapor cycle refrigeration system having an enthalpyexpander-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 (1 22) 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.

Natural cooling unit control method and device

TRANSCRITICAL VAPOR COMPRESSION SYSTEM AND METHOD FOR IMPLEMENTING, INCLUDING A REFRIGERANT STORAGE TANK AND A NON-VARIABLE EXPANSION DEVICE

POMPE A CHALEUR POUR LE CHAUFFAGE DE BATIMENTS

CETTE POMPE A CHALEUR EST DU TYPE COMPRENANT UNE INSTALLATION DANS LAQUELLE CIRCULE, EN CIRCUIT FERME, UN FLUIDE FRIGORIGENE, COMPRENANT NOTAMMENT UN COMPRESSEUR 2, UN CONDENSEUR 3, UN RESERVOIR 4, UN DETENDEUR 5 ET UN EVAPORATEUR 6. SELON L'INVENTION, ELLE EST EQUIPEE D'UNE TUBULURE 7 RELIANT LA PARTIE HAUTE DU RESERVOIR 4 A LA CANALISATION D'ASPIRATION DU COMPRESSEUR 2, D'UN REGULATEUR DE PRESSION 8 EN AMONT DU RESERVOIR, ET D'UN REGULATEUR DE PRESSION 9 SUR LA TUBULURE RELIANT LA PARTIE HAUTE DU RESERVOIR A LA CANALISATION D'ASPIRATION DU COMPRESSEUR.

Method for determining the level of refrigerant charge in a cooling circuit for an air conditioning system

Refrigeration cycle device

CONTROL APPARATUS AND METHOD OF TRIPLE UTILITY ABSORPTION COLD AND HOT WATER DISPENSER

The present invention relates to a control apparatus and a method of a triple utility absorption cold and hot water dispenser. The present invention compares real-time solution level information of a float and pressure and temperature data inside a third regenerator with a preset value. Then, the present invention controls a circulation amount of each of the following solutions: a dilute lithium bromide solution absorbed by an absorber provided in an absorption type refrigerator (hereinafter referred to as ′a diluted solution′); a medium solution which is thicker than the diluted solution produced by heating the diluted solution; and a concentrated aqueous solution which is thicker than the medium solution produced by heating a moderation drug. Therefore, the present invention is characterized by switching an optimum operation mode according to an operation. Thus, the present invention can be applied to the triple utility absorption cold and hot water dispenser of gas directing type using ...

DEVICE AND METHOD FOR THE CONTINUOUS THERMOCHEMICAL PRODUCTION OF COLD

The invention relates to a system and a thermochemical method for the production of cold, of the type that uses at least one reactive device comprising a reactor (1a, 1b) or a chamber for storing a reactive product that can absorb a gas. The reactive product and the gas are such that, when they are exposed to one another, they undergo a reaction that results in the absorption of the gas by the reactive product and, conversely, they undergo a reaction comprising the desorption of the gas absorbed by the reactive product as a result of heat applied to the reactive product when it absorbed the gas. The system comprises two substantially identical reactive devices disposed such as to have opposing operating cycles, so that when the reactor (1b) of one reactive device is operating in the absorption cycle, the reactor (1a) of the other is operating in the desorption cycle. The system is characterised in that it comprises means for determining the progress rate (X) of the thermochemical reaction ...

TRANSCRITICAL REFRIGERANT VAPOR COMPRESSION SYSTEM WITH CHARGE MANAGEMENT

A refrigerant vapor compression system includes a refrigerant-to-refrigerant heat exchanger economizer and a flash tank disposed in series refrigerant flow relationship in the refrigerant circuit intermediate a refrigerant heat rejection heat exchanger and a refrigerant heat absorption heat exchanger. A primary expansion valve is interdisposed in the refrigerant circuit upstream of the refrigerant heat absorption heat exchanger and a secondary expansion valve is interdisposed in the refrigerant circuit upstream of the flash tank. The flash tank functions as a refrigerant charge storage reservoir wherein refrigerant expanded from a supercritical pressure to subcritical pressure separates into liquid and vapor phases. A refrigerant vapor bypass line is provided to return refrigerant vapor from the flash tank to the refrigerant circuit downstream of the refrigerant heat absorption heat exchanger. The primary expansion valve and a flow control valve interdisposed in the refrigerant vapor bypass ...

Refrigeration system utilizing an enthalpy expansion jet compressor

A closed loop vapor cycle refrigeration system an expander-compressor is disclosed. A portion of the liquid refrigerant in the system is expanded into gas. This gas is used to operate a compressor. The compressor compresses the low pressure gas from the evaporator and discharges the compressed gas either to a primary compressor or the condenser. A novel expander-compressor device is also disclosed for use in the refrigeration system.

Air conditioning apparatus using supercritical refrigerant for vehicle

An air conditioning apparatus includes a refrigerating cycle supplying the supercritical refrigerant pressurized by the variable displacement compressor to the outdoor heat exchanger, the expansion valve and the indoor heat exchanger, in sequence and subsequently return the supercritical refrigerant to the variable displacement compressor. The apparatus further includes a displacement control unit that establishes a limit value derived from the engine speed and further controls a discharge volume of the compressor prior to the control in the opening degree of the expansion valve, on a basis of the so-established limit value.

Refrigerant flow-amount controlling device and ejector refrigerant cycle system using the same

A refrigerant flow-amount controlling device for an ejector refrigerant cycle system includes an ejector having a nozzle for decompressing refrigerant of a first stream of a branch portion, a first evaporator for evaporating refrigerant flowing out of the ejector, a throttle member for decompressing refrigerant of a second stream of the branch portion, a second evaporator disposed downstream of the throttle member and upstream of a refrigerant suction portion of the ejector, and an adjusting mechanism having a temperature-sensitive deformation member that is deformed in accordance with a variation in a refrigerant temperature of the cycle system to adjust one refrigerant passage area of the nozzle portion and the throttle means. The adjusting mechanism can be provided to adjust a flow ratio of a refrigerant amount decompressed by the nozzle portion of the ejector and a refrigerant amount drawn into the refrigerant suction port of the ejector.

Method for handling fault mitigation in a vapour compression system

A method for controlling a vapour compression system (1) is disclosed. A mass flow of refrigerant along a part of the refrigerant path is estimated, based on measurements performed by one or more pressure sensors (10, 12, 13) for measuring a refrigerant pressure at selected positions along the refrigerant path and one or more temperature sensors (11, 14) for measuring a refrigerant temperature at selected positions along the refrigerant path. A refrigerant pressure or a refrigerant temperature at a selected position a pressure sensor (10, 12, 13) or temperature sensor (11, 14) along the refrigerant path is derived, based on the estimated mass flow. The vapour compression system (1) is allowed to continue operating, even if a sensor (10, 11, 12, 13, 14) is malfunctioning or unreliable.

Apparatus for connection to an HVAC-R system during maintenance or commissioning and methods of maintenance or commissioning for an HVAC-R system

An apparatus 15 for connection to an HVAC-R system during maintenance or commissioning comprises a plurality of ports 16, 17, 18 for fluid connection to the HVAC-R system and to maintenance apparatus, for example a refrigerant tank, a refrigerant recovery unit and/or a vacuum pump. The apparatus also includes a plurality of fluid connections 20 between the ports, each of the fluid connections having an electrically actuatable valve 21 to open and close the fluid connection. The apparatus also includes a control unit configured to control each of the valves to configure the plurality of fluid connections. The control unit may comprise a communications unit (33, Fig 6), preferably a Bluetooth unit, configured to communicate with a remote device. The plurality of ports may comprise a first port for connection to a high-pressure service port of the HVAC-R system and a second port for connection to a low-pressure service port of the HVAC-R system and a maintenance port. Preferably a pressure ...

Apparatus for connection to an HVAC-R system during maintenance or commissioning and methods of maintenance or commissioning for an HVAC-R system

Refrigeration cycle device

This refrigeration cycle device has: a plurality of refrigerant circuits, each having a compressor, heat source-side heat exchanger, and decompression device, which are connected to each other; and a heat medium circuit having a plurality of heat medium heat exchangers, which are provided to the refrigerant circuits, respectively, and which exchange heat between a refrigerant and a heat medium. The heat medium circuit is provided with a flow channel switching device that performs switching between a series flow channel wherein the heat medium heat exchangers are connected in series, and a parallel flow channel wherein the heat medium heat exchangers are connected in parallel.

HEATING AND COOLING SYSTEM

VAPOUR COMPRESSION REFRIGERATION SYSTEM AND METHOD OF OPERATING SUCH A SYSTEM

The invention relates to a vapour compression refrigeration system (1), capable of operating in a transcritical mode, comprising a main refrigerant circuit (2) which in turn comprises: - a primary compressor group (10); - a gas cooler or condenser (11) placed downstream of said primary compressor group (10); - an expansion device (12) placed downstream of said gas cooler or condenser (11); - a liquid receiver (13) placed downstream of said expansion device (12); - at least one evaporator (14'; 14") placed downstream of said liquid receiver (13) and upstream of said primary compressor group (10). The refrigeration system (1) further comprises: - an emergency circulation duct (20) of the refrigerant fluidically connecting said liquid receiver (13) to the main circuit upstream of said gas cooler or condenser (11) by-passing said at least one evaporator (14'; 14") and said primary compressor group (10), to allow a flow of refrigerant from the liquid receiver (13) to the gas cooler or condenser ...

REFRIGERATION SYSTEM WITH TRANSFER SYSTEM

A refrigeration system comprising a main refrigeration circuit including a compression stage, a condensing stage, and an evaporation stage, a refrigerant circulating between the compression stage, the condensing stage and the evaporation stage in a refrigeration cycle. An integrated transfer system is in closeable and openable fluid communication with the main refrigeration circuit, the transfer system including a receiver. Valves are operable to selectively open the fluid communication between the main refrigeration circuit and the transfer system. A motive force source displaces refrigerant from the main refrigeration circuit to the transfer system.

SYSTEM AND METHOD FOR CONTROL OF A TRANSCRITICAL REFRIGERATION SYSTEM

A system and method for a CO2 refrigeration system includes a compressor, a heat exchanger, a liquid receiver, a first valve, and a valve controller. The heat exchanger operates as a gas cooler when the CO2 refrigeration system is in a transcritical mode and as a condenser when the CO2 refrigeration system is in the subcritical mode. The first valve controls a flow of refrigerant from the heat exchanger to the liquid receiver. The valve controller monitors an outdoor ambient temperature and a pressure of refrigerant exiting the heat exchanger, determines whether the CO2 refrigeration system is in the subcritical mode or in the transcritical mode, determines a pressure setpoint based on the monitored outdoor ambient temperature, and controls the first valve based on a comparison of the determined pressure setpoint and the monitored pressure when the CO2 refrigeration system is in the transcritical mode.

A METHOD FOR CONTROLLING A VAPOUR COMPRESSION SYSTEM WITH A VARIABLE RECEIVER PRESSURE SETPOINT

A method for controlling a vapour compression system (1) is disclosed, the vapour compression system (1) comprising at least one expansion device (8) and at least one evaporator (9). For each expansion device (8), an opening degree of the expansion device (8) is obtained, and a representative opening degree, ODrep, is identified based on the obtained opening degree(s) of the expansion device(s) (8). The representative opening degree could be a maximum opening degree, ODmax, being the largest among the obtained opening degrees. The representative opening degree, ODrep, is compared to a predefined target opening degree, ODtarget, and a minimum setpoint value, SPrec, for a pressure prevailing inside a receiver (7), is calculated or adjusted, based on the comparison. The vapour compression system (1) is controlled to obtain a pressure inside the receiver (7) which is equal to or higher than the calculated or adjusted minimum setpoint value, SPrec.

DEVICE AND PROCESS OF PRODUCTION CONTINUE OF COLD BY THERMOCHEMICAL WAY

La présente invention concerne un système et un procédé thermochimique de production de froid du type mettant en oeuvre au moins un dispositif réactif comprenant d'un réacteur (1a, 1b), ou enceinte de stockage d'un produit réactif apte à absorber un gaz, le produit réactif et le gaz étant tels que, lorsqu'ils sont mis en présence l'un de l'autre, ils sont l'objet d'une réaction ayant pour effet l'absorption du gaz par le produit réactif et, à l'inverse, ils sont l'objet d'une réaction de désorption du gaz absorbé par le produit réactif sous l'effet d'un chauffage appliqué au produit réactif lorsque celui-ci a absorbé du gaz. Le système est caractérisé en ce qu'il comprend deux dispositifs réactifs sensiblement identiques disposés de façon telles qu'il fonctionnent en opposition de cycle de façon que lorsque le réacteur (lb) de l'un fonctionne en absorption, le réacteur (la) de l'autre fonctionne en désorption.

히트펌프 및 그 제어방법

... 본 발명은 압축기, 실내열교환기, 팽창밸브 및 실외열교환기를 포함하는 히트펌프 및 그 제어방법으로서, 상기 실내열교환기를 통과하는 수배관; 상기 수배관의 출구측에 구비되어 상기 수배관을 흐르는 물의 출수온도를 감지하는 온도센서; 및 시동운전 시에 상기 압축기를 기설정된 시동 주파수로 운전시키고, 시동운전 이후에 냉매 사이클의 목표압력에 기초하여 압축기의 주파수를 제어하는 제어부를 포함하고, 상기 제어부는 입력된 설정온도와 상기 온도센서에서 감지된 출수온도 사이의 차이인 설정온도차에 기초하여 상기 목표압력을 결정하는 것을 특징으로 하는 히트펌프 및 그 제어방법을 제공한다.

REFRIGERATION SYSTEM UTILIZING A JET ENTHALPY COMPRESSOR FOR ELEVATING THE SUCTION LINE PRESSURE

A refrigeration system which utilizes a portion of the energy of the condensate liquid to elevate the pressure of the gas in the suction line above the evaporator pressure is disclosed. A jet enthalpy compressor (140) is used as a means for elevating the suction line pressure. The refrigeration system contains a reservoir (44) which stores liquid and gas refrigerants. The liquid refrigerant (48) from the reservoir passes to an evaporator system (50) wherein it evaporates to a low pressure gas, which is discharged into the suction line (10). The jet enthalpy compressor (140) is disposed in the suction line between the reservoir (40) and the compressor (14). The jet enthalpy compressor (140) contains ejectors (210, 212, 214), each ejector having its nozzle end placed in the suction line. Gas refrigerant from the reservoir (40) is controllably discharged into the suction line (10) through the nozzle ends of the ejectors to elevate the pressure in the suction line. The gas through the ejectors ...

Vehicle air conditioning systems comprising refrigerant recovery vessels and methods for operating such systems

An air conditioning system for a vehicle including a vapor compression-type refrigerating cycle and using combustible refrigerant includes a refrigerant recovery vessel in communication with a gas-liquid separator and which of recovers the combustible refrigerant by the communication with the gas-liquid separator, and a valve which controls the communication between the refrigerant recovery vessel and the gas-liquid separator in response to an external signal. When combustible refrigerant is used as refrigerant of a vapor compression-type, refrigerating cycle, leakage of the refrigerant may be reduced, minimized, or eliminated, and the recovery of the refrigerant may be carried out readily and efficiently without requiring significant changes to the system configuration.

Supercritical refrigeration cycle

A supercritical refrigeration cycle comprises a radiator 2 for cooling the refrigerant discharged from a compressor 1, a cooling fan 2a for blowing the atmospheric air to the radiator 2, a decompression unit 4 for decompressing the refrigerant at the outlet of the radiator 2 and having the opening degree thereof controlled to achieve a target high pressure, and an evaporator 5 for evaporating the low-pressure refrigerant decompressed by the decompression unit 4. The high pressure exceeds the critical pressure of the refrigerant. A value of information representing the difference between the actual radiation state of the refrigerant at the outlet of the radiator 2 and the ideal radiation state determined by the atmospheric temperature is calculated, and based on this value of information, the air capacity of the cooling fan 2a is controlled to decrease the difference. Thus, the cooling fan of the high-pressure radiator can be properly controlled in the supercritical refrigeration cycle.

Refrigerant circulating system

A refrigerant circulation system of the present invention includes a compressor, a condenser, a evaporator, a throttle device and a control unit. The control unit controls a composition of a refrigerant circulating in the refrigerant circulation system based on a temperature and pressure of the refrigerant of an inlet and outlet portion of the compressor, condenser, evaporator and throttle device. The control unit controls to open and close the throttle device to change the composition of the refrigerant circulating in the refrigerant circulation system.

Climate-control system having multiple compressors

A system may include first and second compressors and first, second and third heat exchangers. The first heat exchanger may receive working fluid discharged from the first and second compressors. The second heat exchanger may be disposed downstream of the first heat exchanger and may provide working fluid to the first compressor. The third heat exchanger may be disposed between the first and second heat exchangers and may include an inlet and first and second outlets. The first outlet may provide working fluid to the second heat exchanger. The second outlet may provide working fluid to the second compressor.

REFRIGERATION APPARATUS

This refrigeration apparatus (1) comprises a main refrigerant circuit (2) including a positive displacement compressor (4), a condenser (6), an expansion valve (8), an evaporator (10), through which a refrigerant circulates successively in a closed loop circulation, and a lubrication refrigerant line (18) in fluid connection with the main refrigerant circuit (2) and connected to the compressor (4) for lubrication of said compressor (4) with the refrigerant. The refrigeration apparatus (1) comprises a refrigerant container (20) connected between the condenser (6) and the expansion valve (8), said refrigerant container (20) being configured to retain a quantity of refrigerant, the lubrication refrigerant line (18) being connected to said refrigerant container (20). The refrigeration apparatus (1) further comprises heating means (28) for heating the refrigerant contained in the refrigerant container (20).

Method for a pressure-based determining of a product parameter in a freeze dryer, freeze dryer and software product

Methods are disclosed for the pressure-based determining of a product parameter in a freeze dryer, in particular a product temperature. At a point in time tSTART, a closing element as an intermediate valve between an ice chamber and a drying chamber of the freeze dryer is closed. Then, during a pressure rise occurring due to the sublimation pressure values (P1, P2, . . . ) are measured in the drying chamber. At a point in time tEND then the closing element is opened. From the measured pressure values (P1, P2, . . . ) an approximation of a product parameter, in particular a product temperature TAPPROX, is determined. The point in time tEND is determined specifically for the measured pressure values (P1, P2, . . . ) such that the time span for which the closing element is closed depends on the determined pressure values and such that the time span is variable during a drying process.

SYSTEM AND METHOD FOR CONTROLLING A REFRIGERATION SYSTEM

A method and system for operating a CO2 refrigeration system is provided. Two pressures are controlled by two controllers through two valves in this system. A first valve is actuated by a first controller using a first transfer function in response to the first measured pressure. A second valve is actuated by a second controller using a second transfer function in response to the second measured pressure. When it is determining the second valve failed to operate correctly, the first valve is actuated by a third controller using a third transfer function.

HEAT PUMP

A gas-side stop valve on the gas refrigerant side and a liquid-side stop valve on the liquid refrigerant side are provided in a package of an outdoor unit. A gas-side filter on the gas refrigerant side is mounted on the indoor unit side relative to the gas-side stop valve and inside the package of the outdoor unit. A liquid-side filter 9 on the liquid refrigerant side is mounted on the indoor unit side relative to the liquid-side stop valve and inside the package of the outdoor unit. As a result, it is not necessary to ensure a place for mounting the gas-side filter and the liquid-side filter at the time of installation on site and the workability can be improved.

Device for separating lubricant from a lubricant-refrigerating gas mixture discharged from at least one refrigerant compressor

The separating device according to the invention comprises a body delimiting a separating chamber, at least one inlet orifice emerging in the separating chamber and intended to be connected to a discharge orifice of the refrigerant compressor so as to allow a lubricant-refrigerating gas mixture to be introduced into the separating chamber, at least one lubricant outlet orifice emerging in the separating chamber and intended to be connected to a lubricant pan formed in the refrigerant compressor. The separating device comprises a first measuring means arranged to measure the temperature of the lubricant contained in the lubricant pan formed in the refrigerant compressor, and a regulating arranged to regulate the temperature of the lubricant separated in the separating chamber as a function of the temperature of the lubricant measured by said first measuring means.

Heating dedicated air conditioner

A heating dedicated air conditioner includes a compression mechanism, an indoor heat exchanger, an outdoor heat exchanger, an expansion mechanism provided between one end of the indoor heat exchanger and one end of the outdoor heat exchanger, a four-way switching valve switchable between first and second states of connection between the compressor and the heat exchangers, a fan ventilating the indoor heat exchanger, and a control unit controlling at least the compressor, the expansion mechanism, the four-way switching valve, and the fan. The control unit switches the four-way switching valve to the second state in a test operation mode, which includes a drain water inhibited interval during which drain water inhibition control is performed. The control unit operates the compressor and stops the fan when the drain water inhibition control is performed.

Refrigeration Cycle

Provided is a refrigeration cycle suitable for an air conditioning system for vehicles, wherein a flow rate of refrigerant which is used to estimate a torque of a compressor can be precisely estimated by accurately detecting a difference between pressures at upstream and downstream sides of an orifice having a high correlation with the refrigerant flow rate, and ultimately, the torque of the compressor can be precisely estimated, and the estimation can be achieved while achieving space saving and cost down. Disclosed is a refrigeration cycle which has a subcool condenser integrally provided with a condensing part for refrigerant, a liquid receiver and a subcooling part, and wherein an orifice for throttling the flow of refrigerant which has passed through the condensing part of the subcool condenser is disposed, a pressure difference detection means capable of detecting a difference between pressures at upstream and downstream sides of the orifice is provided, and provided are a refrigerant flow rate estimation means for estimating a flow rate of the refrigerant with reference to the detected pressure difference and a compressor torque estimation means for estimating a torque of the compressor with reference to the estimated flow rate of the refrigerant.

Pressure spike reduction for refrigerant systems incorporating a microchannel heat exchanger

A refrigerant system includes at least one compressor ( 54, 56 ) that compresses refrigerant and delivers it downstream to a heat rejection heat exchanger ( 26 ). The heat rejection heat exchanger is a microchannel heat exchanger. Refrigerant passes from the heat rejection heat exchanger downstream to an expansion device ( 60 ), from the expansion device through an evaporator ( 66 ), and from the evaporator back to the at least one compressor. A control ( 58 ) operates at least one compressor and the expansion device to reduce pressure spikes at transient conditions.

Dehumidification control in refrigerant vapor compression systems

A method and apparatus are disclosed for controlling dehumidification of an airflow to be conditioned for supply to a climate controlled space. The airflow to be conditioned is passed over a plurality of refrigerant conveying conduits of an evaporator of a refrigerant vapor compression thereby cooling the airflow. A controller operates the refrigeration vapor compression system to maintain the airflow at a set point air temperature indicative of a desired temperature within the climate controlled space. The controller also adjusts an evaporator expansion device for controlling the flow of refrigerant through the evaporator so as to reduce the temperature of the refrigerant within the refrigerant conveying conduits of the evaporator whenever further dehumidification of the air flow to be conditioned is desired.

Parameter control in transport refrigeration system and methods for same

Embodiments of transport refrigeration systems, apparatus, and/or methods for the same can provide exemplary verification for operating characteristics thereof. In one embodiment, a calculated compressor mid stage pressure can be verified using a prescribed relationship to other transport refrigeration system characteristics.

Refrigeration plant and methods of control therefor

A refrigeration plant has a refrigerator circuit comprising a compressor, a condensing coil, an expansion valve and an evaporator. Heat is absorbed in the evaporator and exhausted at the condenser. Pressure is measured at the compressor inlet and a blower arrangement for blowing cool air over a heat transfer surface of the condenser is controlled in dependence upon the pressure measurement.

Method and apparatus for cooling

A method of calculating net sensible cooling capacity of a cooling unit includes measuring a discharge pressure from of fluid from a compressor and a suction pressure from an evaporator, calculating a condensing temperature of fluid flowing from the compressor and an evaporating temperature of fluid flowing from the evaporator, calculating a mass flow rate of fluid flowing from the compressor, calculating enthalpy of fluid flowing from the compressor, of fluid flowing from the thermal expansion valve, and of fluid flowing from the evaporator, calculating a mass flow rate of fluid flowing through the hot gas bypass valve, and calculating net sensible cooling capacity. Embodiments of cooling units and other methods are further disclosed.

Air conditioner and starting control method thereof

An air conditioner having a plurality of compressors and a starting control method thereof, where the plurality of compressors is simultaneously started if a starting load of the air conditioner is smaller than a reference load, and the plurality of compressors is sequentially started if the starting load of the air conditioner is larger than the reference load, thereby simultaneously starting the plurality of compressors at a starting load section in which a starting stability of the compressors is secured, and thus capable of enhancing the cooling and heating performance.

Method and Apparatus for Monitoring A Refrigeration-Cycle System

A monitoring system for monitoring operation of a refrigerant-cycle system is disclosed. A condenser unit sensor measures an operating characteristic of a condenser unit, the condenser unit including a condenser and a compressor. An evaporator unit sensor measures an operating characteristic of an evaporator unit, the evaporator unit including an evaporator and a fan. An electrical sensor measures an electrical quantity indicative of power consumption of the refrigerant-cycle system. A processing system calculates an efficiency of the refrigerant-cycle system based on the power consumption of the refrigerant-cycle system, the operating characteristic of the condenser unit, and the operating characteristic of the evaporator unit.

Heating and/or cooling system and related methods

A method of heating and/or cooling an area to a desired temperature comprising using a heat pump having an evaporator, a compressor, a condenser and an expansion control means each connected by a refrigerant pipe work system and the method comprising monitoring the temperature of an environment in which the evaporator is operating and using a system controller to vary in response to the monitored temperature, the temperature at which gas condenses to a fluid within the condenser to keep it as low as possible whilst maintaining the condensing temperature a predetermined amount above the desired temperature and/or also varying in response to the monitored temperature, the temperature at which a liquid expands to a gas within the evaporator in order to reduce the difference between the evaporating and condensing temperatures.

Refrigeration apparatus-use unit, heat source unit, and refrigeration apparatus

A switching mechanism (TV1, TV2, TV3, TV4, FV) includes an electric motor (74), a flow path switching portion (71) to be driven by the electric motor (74), a first port (P1) connected to a high-pressure flow path (7, 24, 28b, 31, 32) of a refrigerant circuit (6), a second port (P2) connected to a low-pressure flow path (8, 25, 28a, 33, 34) of the refrigerant circuit (6), and a third port (P3) connected to a predetermined flow path of the refrigerant circuit (6). The switching mechanism (TV1, TV2, TV3, TV4, FV) is switched between a first state in which the first port (P1) communicates with the third port (P3) and a second state in which the second port (P2) communicates with the third port (P3) in such a manner that the electric motor (74) drives the flow path switching portion (71).

BATTERY COOLANT CIRCUIT CONTROL

A vehicle includes a refrigerant system having a chiller and a coolant system having a chiller loop and a radiator loop. The chiller loop is arranged to circulate coolant through the chiller, and the radiator loop is arranged to circulate coolant through a battery, a radiator, and a bypass valve connected to a bypass conduit. A controller is configured to, in response to an ambient-air temperature exceeding a battery-coolant temperature, actuate the valve to circulate coolant to the bypass conduit to skip the radiator. 1. A thermal-management system for a traction battery of a hybrid vehicle , the thermal-management system comprising:a refrigerant subsystem including a compressor, a condenser, a battery chiller, and an evaporator; a proportioning valve having first and second outlets, and an inlet connected in fluid communication with an outlet side of the traction battery via an outlet conduit,', 'a temperature sensor disposed on the outlet conduit and configured to output a signal indicative of a coolant temperature,', 'a chiller loop connected in fluid communication with the first outlet and arranged to convey coolant through the chiller to transfer heat from the coolant subsystem to the refrigerant subsystem, and', 'a radiator loop connected in fluid communication with the second outlet and arranged to convey coolant through the radiator to transfer heat from the coolant subsystem to outside air, the radiator loop having a bypass valve configured to route coolant around the radiator via a bypass line when the valve is actuated to a bypass position and configured to route coolant to the radiator when the valve is actuated to a radiator position; and, 'a coolant subsystem including'}a controller configured to, in response to the proportioning valve directing at least a portion of the coolant to the second outlet and the outside air temperature exceeding the coolant temperature, actuate the bypass valve to the bypass position.2. The thermal-management system of ...

AIR-CONDITIONING APPARATUS

Provided is an air-conditioning apparatus that can suppress occurrence of disproportionation (an autolytic reaction) when HFO1123 refrigerant or a refrigerant mixture containing HFO1123 is applied. The air-conditioning apparatus of the present invention includes a controller controlling at least one of an operation frequency of a compressor an opening degree of an expansion valve and an air amount of a fan sending air to a heat-source-side heat exchanger so that a temperature and a pressure of the refrigerant discharged from the compressor do not exceed threshold values. 1. An air-conditioning apparatus comprising:a refrigerant circuit in which a compressor, a heat-source-side heat exchanger, an expansion valve, and a user-side heat exchanger are sequentially connected, and refrigerant circulates therethrough, the refrigerant being HFO1123 refrigerant or a refrigerant mixture containing HFO1123;a bypass branching from a pipe connecting the expansion valve and the user-side heat exchanger and connecting at a suction side of the compressor;a vessel provided to the bypass; anda controller configured to, at a time of a pump down operation in which the refrigerant discharged from the compressor is stored in the vessel via the bypass, control at least one of an operation frequency of the compressor, an opening degree of the expansion valve, and an air amount of a fan sending air to the heat-source-side heat exchanger so that a temperature and a pressure of the refrigerant discharged from the compressor do not exceed threshold values.2. The air-conditioning apparatus of claim 1 , further comprising:a discharge pressure sensor configured to detect the pressure of the refrigerant discharged from the compressor; anda suction pressure sensor configured to detect a pressure of the refrigerant sucked into the compressor,wherein the controller calculates the temperature of the refrigerant discharged from the compressor from detection values of the discharge pressure sensor and ...

Refrigerant Compressor System

In order to improve the operational reliability of a refrigerant compressor system that includes a first refrigerant line that conducts expanded refrigerant, a second refrigerant line that conducts compressed refrigerant, at least one refrigerant compressor that is arranged between the first and the second refrigerant line and is driven by a motor, and a control unit for operating the refrigerant compressor system, it is proposed that the control unit should have a first central processing unit and at least one input/output unit for control variables that communicates with the first central processing unit, and that there should be associated with the first central processing unit a second central processing unit which, in the event of a failure of the first central processing unit, takes over the control functions for the purpose of controlling the refrigerant compressor system.

CHILLER CONTROL DEVICE, CHILLER, AND CHILLER DIAGNOSTIC METHOD

This chiller control device () is provided with: a storage unit () which stores operation data detected at each site in a turbo chiller; a compression unit () which, when the size of the operation data accumulated over time in the storage unit () becomes too large, converts the operation data each time a condition depending on the type of operation data is met, thereby compressing the data size; and a diagnostic unit () which evaluates the state of the turbo chiller on the basis of the operation data converted by the compression unit (). By this means, the state of the chiller can be diagnosed without increasing the storage capacity of the storage medium that stores operation data of the turbo chiller. 1. A chiller control device , comprising:storage means for storing operation data which is detected at each site in a chiller;compression means for converting, when the size of the operation data accumulated in the storage means over time increases, the operation data each time a condition corresponding to the type of the operation data is met, and compressing the data size; andstate evaluation means for evaluating the state of the chiller on the basis of the operation data which is converted by the compression means.2. The chiller control device according to claim 1 ,wherein the compression means compresses the data size by smoothing the operation data for every division corresponding to a size of an operation parameter of the chiller, andwherein the state evaluation means calculates a difference between the operation data compressed by the compression means and a reference value corresponding to the division, and evaluates the operation state of the chiller by comparing the difference and a threshold value corresponding to the division.3. The chiller control device according to claim 2 ,wherein the state evaluation means informs a different evaluation result according to a deviation state between the difference and the threshold value.4. A chiller comprising the ...

CRYOCOOLER

A cryocooler includes a displacer, a cylinder that forms an expansion space, a Scotch yoke mechanism configured to drive the displacer in a reciprocating manner, a first rod that extends from the Scotch yoke mechanism, a housing that includes an assist chamber, a rotary valve configured to switch between a state in which the expansion space and a discharge side of a compressor are connected and the assist chamber and a suction side of the compressor are connected and a state in which the expansion space and the suction side of the compressor are connected and the assist chamber and the discharge side of the compressor are connected, a motor configured to drive the Scotch yoke mechanism and the rotary valve, and an on-off valve configured to open and close a gas flow path through which the rotary valve and the assist chamber are connected. 1. A cryocooler comprising:a displacer;a cylinder that accommodates the displacer and is configured such that as the displacer reciprocates, an expansion space between the displacer and the cylinder is formed;a reciprocating drive mechanism configured to drive the displacer in a reciprocating manner;an assist rod that extends toward a side opposite to the displacer from the reciprocating drive mechanism;a housing that includes a drive mechanism accommodation chamber accommodating the reciprocating drive mechanism and an assist chamber accommodating a distal end of the assist rod;a switch valve configured to switch between a first state in which the expansion space and a discharge side of a compressor are connected and the assist chamber and a suction side of the compressor are connected, and a second state in which the expansion space and the suction side of the compressor are connected and the assist chamber and the discharge side of the compressor are connected;a reversible motor configured to drive the switch valve; andan on-off valve configured to open and close a gas flow path through which the switch valve and the assist ...

REFRIGERANT CHARGE DEVICE AND REFRIGERANT CHARGE SYSTEM HAVING THE SAME

The present invention provides an inexpensive and stable refrigerant charging device and a refrigerant charging system by improving a charging speed and reducing costs while preventing liquid-back. The present invention includes a refrigerant charging flow path having a refrigerant charging port connected to a refrigerant flow path of an air conditioner, a valve provided at the refrigerant charging flow path, and a control device configured to control the valve. The control device includes a discharging superheat calculator configured to calculate the discharging superheat degree from a refrigerant temperature and a refrigerant pressure at a discharge side of a compressor, and a valve controller configured to control the opening and closing state of the valve based on the calculated discharging superheat degree calculated by the discharge super-heat calculator. 1. A refrigerant charging device for charging a refrigerant in a refrigerant flow path of an air conditioner , the refrigerant charging device comprising:a refrigerant charging port connected to the refrigerant flow path;a valve configured to regulate a supply of the refrigerant;a communicator configured to perform communication with the air conditioner; and obtain a discharging superheat degree of the refrigerant in the air conditioner from a refrigerant pressure and a refrigerant temperature at a discharge side of a compressor of the air conditioner received through the communicator, and', 'control opening and closing of the valve based on the obtained discharging superheat degree., 'at least one processor configured to2. The refrigerant charging device of claim 1 , wherein the at least one processor is further configured to control the closing of the valve when the obtained discharging superheat is below a threshold value.3. The refrigerant charging device of claim 2 , wherein the at least one processor is further configured to control the closing of the valve when the obtained discharging superheat ...

AIR-CONDITIONING APPARATUS

Provided is an air-conditioning apparatus configured so that a decrease in a refrigeration capacity can be suppressed without increasing the amount of refrigerant with which a refrigerant circuit is filled and that refrigerant can be suitably stored during a pump down operation. The air-conditioning apparatus includes a first on-off valve provided at a pipe between an expansion valve and a use side heat exchanger, a bypass branching from a pipe between the expansion valve and the first on-off valve and connected to a pipe at a suction-side of a compressor, and a refrigerant storage unit configured to store the refrigerant having passed through the bypass. In a pump down operation in which the compressor operates with the first on-off valve being in a closed state, the refrigerant having flowed out from the heat source side heat exchanger flows into the bypass, and then, is stored in the refrigerant storage unit. 1. An air-conditioning apparatus comprising:a refrigerant circuit in which a compressor, a heat source side heat exchanger, an expansion valve, and a use side heat exchanger are connected by pipes, and refrigerant circulates;a first on-off valve provided at a pipe between the expansion valve and the use side heat exchanger;a bypass branching from a pipe between the expansion valve and the first on-off valve or a pipe between the heat source side heat exchanger and the expansion valve and connected to a pipe on a suction side of the compressor; anda refrigerant storage unit configured to store the refrigerant passed through the bypass, the refrigerant storage unit storing the refrigerant flowing into the bypass from the heat source side heat exchanger in a pump down operation in which the compressor operates with the first on-off valve being in a closed state.2. The air-conditioning apparatus of claim 1 , further comprising:a first bypass on-off valve provided on a refrigerant inflow side of the bypass; anda second bypass on-off valve provided on a ...

Compressor Operation Management In Air Conditioners

In various implementations, compressor operation in an air conditioner may be managed by maintaining oil viscosity, a temperature differential, compressor sump temperature, and/or suction pressure. Properties of the air conditioner or portions thereof, such as the compressor, may be determined. To manage compressor operations, operation(s) of the air conditioner may be adjusted based on one or more of the determined properties.

Digital monitoring and measuring air conditioner recharging system

A system for measuring and recharging an air conditioning system includes a vent sensor configured to be coupled to an outlet vent of an air conditioning system. The vent sensor is configured to measure at least one parameter of an air flow from the outlet vent. A processor is in signal communication with the vent sensor. The processor is configured to receive the at least one parameter of the air flow and determine a current refrigerant level of the air conditioning system.

CONTROL DEVICE FOR REFRIGERATION CYCLE APPARATUS, AND CONTROL METHOD FOR REFRIGERATION CYCLE APPARATUS, AND REFRIGERATION CYCLE APPARATUS

A refrigeration cycle apparatus controller includes an expansion-valve controller configured to output an opening-degree command for an expansion valve based on a deviation between a discharge temperature of refrigerant discharged from a compressor and a set discharge temperature, and at least two control parameters including a proportionality coefficient and an integral coefficient, a flow-rate-correction-coefficient calculator configured to calculate a flow-rate correction coefficient from a refrigerant flow rate of refrigerant circulating through a refrigerant circuit and a preset flow-rate reference value, and a coefficient corrector configured to calculate the proportionality coefficient by correcting a preset proportionality-coefficient reference value based on the flow-rate correction coefficient, and calculate the integral coefficient by correcting a preset integral-coefficient reference value based on the flow-rate correction coefficient. The proportionality coefficient and the integral coefficient are calculated such that a variation range of the integral coefficient rate is larger than a variation range of the proportionality coefficient. 1. A control device of a refrigeration cycle apparatus including a refrigerant circuit in which a compressor , a condenser , an expansion valve , and an evaporator are connected by a refrigerant pipe , the control device comprising:an expansion-valve control unit configured to output an opening-degree command for the expansion valve on a basis of a discharge-temperature deviation between a discharge temperature of refrigerant discharged from the compressor and a set discharge temperature, and at least two types of control parameters including a proportionality coefficient and an integral coefficient;anda coefficient correcting unit configured to calculate the proportionality coefficient and the integral coefficient corresponding to a refrigerant flow rate of refrigerant circulating through the refrigerant circuit,the ...

AIR CONDITIONING APPARATUS

When charging a refrigerant circuit with refrigerant, a control component starts a heating refrigerant charging operation that is performed by switching the refrigerant circuit to a heating cycle state and performs the heating refrigerant charging operation until a predetermined heating refrigerant charging completion condition is met. Thereafter, the control component switches to a cooling refrigerant charging operation that is performed by switching the refrigerant circuit to a cooling cycle state and performs the cooling refrigerant charging operation until a refrigerant charging completion condition where the refrigerant circuit is charged with a prescribed quantity of the refrigerant is met. 1. An air conditioning apparatus comprising:a refrigerant circuit that is configured as a result of an outdoor unit having an outdoor heat exchanger and plural indoor units having indoor heat exchangers being interconnected via a liquid refrigerant communication pipe and a gas refrigerant communication pipe, the refrigerant circuit being switchable to a cooling cycle state, which causes the outdoor heat exchanger to function as a radiator of a refrigerant and causes the indoor heat exchangers to function as evaporators of the refrigerant, and a heating cycle state, which causes the outdoor heat exchanger to function as an evaporator of the refrigerant and causes the indoor heat exchangers to function as radiators of the refrigerant; anda control component that controls devices configuring the outdoor unit and the plural indoor units,wherein when charging the refrigerant circuit with the refrigerant, the control component starts a heating refrigerant charging operation that is performed by switching the refrigerant circuit to the heating cycle state, performs the heating refrigerant charging operation until a predetermined heating refrigerant charging completion condition is met, thereafter switches to a cooling refrigerant charging operation that is performed by switching ...

INTEGRATED SENSOR AND SERVICE PORT WITH ANTI-BLOWBACK FEATURE FOR HVAC EQUIPMENT OR HVAC SYSTEM

An integrated sensor and service port for HVAC (heating, ventilating, and air conditioning) equipment or an HVAC system. The integrated sensor and service port may comprise an anti-blowback mechanism. 1. An apparatus comprising:a housing, said housing having a first connection portion, a second connection portion and a sensor integrated therein, the first connection portion being configured to connect with and cooperate with a service port of heating, ventilating, and air conditioning (HVAC) equipment, the second connection portion being configured to function as the service port, and the sensor adapted to sense a characteristic of the HVAC equipment, andan anti-blowback mechanism adapted to prevent the service port of the HVAC equipment from being opened until the first connection portion is connected to the service port of the HVAC equipment.2. The apparatus of claim 1 , wherein the first connection portion claim 1 , the second connection portion and the sensor are in communication with a channel formed within the housing and said first connection portion comprises:a brass flare fitting over the channel;a flare nut over the brass flare fitting; anda depressor fitting within the brass flare fitting.3. The apparatus of claim 2 , wherein the anti-blowback mechanism comprises a depressor connected to the depressor fitting and is adapted to be received by the housing at a depressor region claim 2 , andwherein movement of the depressor in a first direction retracts the depressor fitting within the housing, leaving the service port of the HVAC equipment in a closed position, and movement of the depressor in a second direction moves the depressor fitting towards the service port of the HVAC equipment such that the depressor fitting may place the service port of the HVAC equipment in an opened position.4. The apparatus of claim 3 , wherein the anti-blowback mechanism further comprises a depressor seal formed within the channel and around the depressor.5. The apparatus of ...

CONTROL SYSTEM FOR HVAC UNIT

A heating, ventilating, and air conditioning (HVAC) system that includes a vapor compression system having a refrigerant, a compressor of the vapor compression system configured to circulate the refrigerant through the vapor compression system, an expansion device of the vapor compression system configured to adjust a flow of the refrigerant through the vapor compression system, and a controller configured to adjust a position of the expansion device based on a measured amount of superheat of the refrigerant entering the compressor, a measured discharge temperature of the refrigerant leaving the compressor, or a combination thereof, such that the measured amount of superheat of the refrigerant entering the compressor reaches a target amount of superheat, the measured discharge temperature of the refrigerant leaving the compressor reaches a target discharge temperature, or a combination thereof. 1. A heating , ventilating , and air conditioning (HVAC) system , comprising:a vapor compression system comprising a refrigerant;a compressor of the vapor compression system configured to circulate the refrigerant through the vapor compression system;an expansion device of the vapor compression system configured to adjust a flow of the refrigerant through the vapor compression system; anda controller configured to adjust a position of the expansion device based on a measured amount of superheat of the refrigerant entering the compressor, a measured discharge temperature of the refrigerant leaving the compressor, or a combination thereof, such that the measured amount of superheat of the refrigerant entering the compressor achieves a target amount of superheat, the measured discharge temperature of the refrigerant leaving the compressor achieves a target discharge temperature, or a combination thereof.2. The HVAC system of claim 1 , wherein the controller comprises a first control module and a second control module claim 1 , wherein the first control module comprises adjusting ...

Motor drive apparatus and refrigeration cycle apparatus

A motor drive apparatus includes a power converter including an inverter having an upper arm and a lower arm, the inverter being configured to control an operation of an electric motor, and a drive controller configured to apply a dead time for preventing a short circuit between the upper arm and the lower arm, and to control the power converter. The drive controller is configured to control the power converter by switching a first mode in which a first correction value representing a time used to correct a voltage drop due to the dead time is employed to control the power converter, and a second mode in which a second correction value smaller than the first correction value is employed to control the power converter.

SYSTEMS AND METHODS FOR COMPRESSOR CLUTCH CONTROL

Methods and systems are provided for controlling an air conditioning compressor clutch. In one example, a method includes monitoring a clutch of an air conditioning system in a vehicle when the air conditioning system is activated, and responsive to determining that the clutch is not engaged, increasing a current flow to the clutch. In this way, engagement of the compressor clutch may be dynamically maintained with a reduced usage of electrical power. 1. A method comprising:monitoring a clutch of an air conditioning system in a vehicle when the air conditioning system is activated; andresponsive to determining that the clutch is not engaged, increasing a current flow to the clutch.2. The method of claim 1 , wherein determining that the clutch is not engaged is based on the refrigerant pressure.3. The method of claim 2 , wherein determining that the clutch is not engaged comprises sensing the refrigerant pressure increasing above a pressure threshold.4. The method of claim 1 , wherein determining that the clutch is not engaged is based on the evaporator temperature.5. The method of claim 4 , wherein determining that the clutch is not engaged comprises sensing the evaporator temperature below a temperature threshold.6. The method of claim 1 , wherein monitoring the clutch comprises monitoring engine speed.7. The method of claim 6 , further comprising:responsive to a dip in the engine speed, determining that the clutch is initially engaged and reducing current flow to the clutch; andresponsive to a flare in the engine speed, determining that the clutch is not engaged and increasing current flow to the clutch.8. The method of claim 1 , wherein monitoring the clutch comprises monitoring compressor pressure claim 1 , and wherein determining that the clutch is not engaged is based on the compressor pressure.9. The method of claim 1 , wherein monitoring the clutch comprises monitoring engine torque claim 1 , and wherein determining that the clutch is not engaged is based on ...

Refrigeration system operation

Devices and systems for refrigeration system operation are described herein. One or more embodiments include a controller having logic to receive inputs from a temperature sensor over a period of time, the inputs indicating determined temperatures in a refrigeration system over the period of time, compare each of the determined temperatures to control limits, sort the determined temperatures into a plurality of categories based on a relationship between the determined temperatures and the control limits, and cause a user interface to display the sorted determined temperatures.

REFRIGERATION RACK MONITOR

Devices, methods, systems, and computer-readable media for a refrigeration rack monitor are described herein. One or more embodiments include a refrigeration system monitor, comprising a computing device with a memory storing instructions executable by a processor to: monitor real time performance metrics for a refrigeration system, wherein the real time performance metrics are received from temperature sensors, pressure sensors, and power sensors coupled to the refrigeration system, compare the real time performance metrics to a performance curve of devices associated with the refrigeration system, and generate health information for the devices associated with the refrigeration system based on the comparison. 1. A refrigeration system monitor , comprising a computing device with a memory storing instructions executable by a processor to:monitor real time performance metrics for a refrigeration system, wherein the real time performance metrics are received from temperature sensors, pressure sensors, and power sensors coupled to the refrigeration system;compare the real time performance metrics to a performance curve of devices associated with the refrigeration system; andgenerate health information for the devices associated with the refrigeration system based on the comparison.2. The refrigeration system monitor of claim 1 , wherein the devices associated with the refrigeration system includes a compressor.3. The refrigeration system monitor of claim 2 , wherein the temperature sensors claim 2 , pressure sensors claim 2 , and power sensors are coupled to the compressor to monitor real time performance of the compressor.4. The refrigeration system monitor of claim 1 , wherein the performance curve is an original equipment manufacturer (OEM) performance curve for a compressor associated with the refrigeration system.5. The refrigeration system monitor of claim 1 , wherein the health information indicates a probability of failure for the devices associated with the ...

Variable Speed Compressor Protection System And Method

A system and method for a compressor includes a compressor connected to a condenser, a discharge line temperature sensor that outputs a discharge line temperature signal corresponding to a discharge line temperature of refrigerant leaving the compressor, and a control module connected to the discharge line temperature sensor. The control module determines a saturated condenser temperature, calculates a discharge superheat temperature based on the saturated condenser temperature and the discharge line temperature, and monitors a flood back condition of the compressor by comparing the discharge superheat temperature with a predetermined threshold. The control module increases a speed of the compressor when the discharge superheat temperature is less than or equal to the predetermined threshold. 1. A method comprising:determining, with a control module, a saturated condenser temperature of a condenser connected to a compressor;receiving, with the control module, a discharge line temperature signal that corresponds to a discharge line temperature of refrigerant leaving the compressor;calculating, with the control module, a discharge superheat temperature based on the saturated condenser temperature and the discharge line temperature;monitoring, with the control module, a flood back condition of the compressor by comparing the discharge superheat temperature with a predetermined threshold; andincreasing a speed of the compressor, with the control module, when the discharge superheat temperature is less than or equal to the predetermined threshold.2. The method of wherein the predetermined threshold is thirty degrees Fahrenheit.3. The method of wherein the control module increases the speed of the compressor when the discharge superheat temperature is less than or equal to the predetermined threshold.4. The method of further comprising decreasing claim 1 , with the control module claim 1 , an opening of an expansion valve associated with the compressor when the discharge ...

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.

Heat pump system capable of adjusting amount of refrigerant stored in liquid receiver

A heat pump system includes a liquid receiver valve that adjusts the amount of a refrigerant stored in a liquid receiver so that a circulation amount of the refrigerant that circulates the heat pump system can be adjusted according to a driving speed of a compressor and performance of the compressor and the heat pump system can be further improved. Also, since a plurality of liquid receiver refrigerant outlets can be selectively opened using a pressure difference between an inlet and an outlet of the compressor, active control can be performed.

AIR CONDITIONER

An air conditioner includes a refrigerant circuit and refrigerant. The refrigerant circuit has a compressor, a condenser, a pressure-regulating valve, and an evaporator. The refrigerant is R32. The pressure-regulating valve includes a flow path causing the refrigerant flowing from the condenser to flow to the evaporator, a pressure reference chamber partitioned from the flow path and filled with inert gas, and a valve portion. The pressure-regulating valve is configured to adjust a degree of opening of the valve portion to adjust a flow rate of the refrigerant flowing through the flow path. The valve portion is configured to increase the degree of opening when a pressure in the flow path is higher than a pressure in the pressure reference chamber, and reduce the degree of opening when the pressure in the flow path is lower than the pressure in the pressure reference chamber. 1. An air conditioner comprising:a refrigerant circuit comprising a compressor, a condenser, a pressure-regulating valve, and an evaporator; andrefrigerant flowing through the refrigerant circuit in an order of the compressor, the condenser, the pressure-regulating valve, and the evaporator, whereinthe refrigerant is R32, a case,', 'a diaphragm attached to an inner side of the case to partition an interior of the case,', 'a flow path provided by partitioning the interior of the case by the diaphragm, the flow path causing the refrigerant flowing from the condenser to flow to the evaporator,', 'a pressure reference chamber partitioned from the flow path by the diaphragm and filled with inert gas,', 'a valve portion disposed in the flow path, and', 'a partition member disposed in the flow path,, 'the pressure-regulating valve comprises'}the pressure-regulating valve is configured to adjust a degree of opening of the valve portion to adjust a flow rate of the refrigerant flowing through the flow path, and increase the degree of opening when a pressure in the flow path is higher than a pressure in ...

System and Method for Power Optimizing Control of Multi-Zone Heat Pumps

Systems and methods for a vapor compression system including primary actuators, secondary actuators, primary sensors that provide a primary set of system outputs, and secondary sensors that provide a secondary set of system outputs. A primary controller receives the primary set of system outputs, and produces a primary set of control inputs for the primary actuators, to regulate one or more zone temperatures to set-points and to regulate one or more critical process variables to set-points. A secondary controller receives the secondary set of system outputs, and produces a secondary set of control inputs, to minimize an overall system power consumption. The secondary inputs may include set-points to the primary controller. The primary outputs may include estimates of critical process variables that are used as inputs to the secondary controller. 1. A vapor compression system , comprising:a set of primary actuators;a set of secondary actuators;a set of primary sensors providing a primary set of system outputs;a set of secondary sensors providing a secondary set of system outputs;a hardware memory includes executable programs and data;a primary controller receives the primary set of system outputs, and produces a primary set of control inputs for the set of primary actuators, to regulate one or more zone temperatures to set-points and to regulate one or more critical process variables to set-points; anda secondary controller receives the secondary set of system outputs, and produces a secondary set of control inputs, to minimize an overall system power consumption, wherein the secondary controller uses an executable program from memory to compute a gradient of a power consumption function, a steady-state gain from the secondary control inputs to the secondary system outputs, and a compensator that includes integral action.2. The vapor compression system of claim 1 , wherein some of the secondary set of system outputs are obtained from a set of secondary estimates from ...

ABNORMALITY DETERMINATION DEVICE, FREEZING DEVICE INCLUDING THIS ABNORMALITY DETERMINATION DEVICE, AND ABNORMALITY DETERMINATION METHOD FOR COMPRESSOR

An abnormality determination device () includes a calculator () calculating a deviation degree of a compressor () from a normal state based on data related to operation of a refrigeration apparatus () and a determination unit () determining whether the compressor () has an abnormality or estimating an abnormality occurrence time based on a calculation result of the calculator (). The calculator () calculates a first index value from data related to operation of the refrigeration apparatus () in a first period and a second index value from data related to operation of the refrigeration apparatus () in a second period that differs in length from the first period. The calculator () calculates the deviation degree of the compressor () from the normal state based on the first index value and the second index value. The determination unit () determines whether the compressor () has an abnormality or estimates an abnormality occurrence time based on the deviation degree of the compressor () from the normal state. 1. An abnormality determination device that determines an abnormality of a compressor of a refrigeration apparatus , the refrigeration apparatus including a refrigerant circuit , and the refrigerant circuit including the compressor , a condenser , and an evaporator and being configured so that a refrigerant circulates through the compressor , the condenser , and the evaporator , the abnormality determination device comprising:a calculator that calculates a deviation degree of the compressor from a normal state based on data related to operation of the refrigeration apparatus; anda determination unit that determines whether the compressor has an abnormality or estimates an abnormality occurrence time based on a calculation result of the calculator, whereinthe data related to operation of the refrigeration apparatus include data related to operation of the refrigeration apparatus in a first period and data related to operation of the refrigeration apparatus in a ...

TEMPERATURE-CONTROLLED SORPTION SYSTEM

A temperature controller for a sorption system having an evaporator to produce a gas, a sorber containing a sorption material to sorb the gas during a sorption phase, a flow channel extending between the evaporator and sorber to provide a gas pathway connecting them, a valve to control the rate of gas flow in the flow channel, and a temperature sensor positioned to measure the temperature of an evaporator surface or the air adjacent thereto indicative of an evaporator surface temperature, and generate a temperature signal. The controller includes an inflatable member having first and second inflation states, and a control unit configured to evaluate the temperature signal and in response control the state of inflation of the inflatable member and thereby the operation of the valve to control the rate of gas flow between the evaporator and sorber through the gas pathway. 133.-. (canceled)34. A temperature controller for a sorption system having an evaporator containing a working fluid to evaporate the fluid to produce a gas , the evaporator including an evaporator surface , a sorber containing a sorption material to sorb the gas during a sorption phase , a flow channel extending between the evaporator and the sorber to provide a gas pathway connecting the evaporator and sorber , a valve located within the flow channel and operable to control the rate of gas flow in the flow channel between the evaporator and the sorber through the gas pathway , and a temperature sensor positioned to measure the temperature of one of the evaporator surface and the air adjacent to the evaporator surface indicative of an evaporator surface temperature , and generate a temperature signal , comprising:an inflatable member having a first inflation state and a second inflation state; anda control unit configured to evaluate the temperature signal and in response control the state of inflation of the inflatable member and thereby the operation of the valve to control the rate of gas flow ...

Referigerant-to-air device

A refrigerant system includes a compressor, an evaporator, an expansion valve, an accumulator or equivalent, one or more earth loops, and auxiliary heat removal means. The auxiliary means comprises a fan and fan coil and the fan forces air between multiple tubes of the fan coil to remove unwanted heat from the hot vapor exiting the compressor.

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.

Apparatus and method for subcooling control based on superheat setpoint control

A system including a setpoint module, a summer, a control module, and an expansion valve module. The setpoint module is configured to indirectly control sub-cooling of a condenser by adjusting a superheat setpoint based on (i) a return air temperature setpoint or a supply air temperature setpoint, and (ii) an outdoor ambient temperature. The summer is configured to determine an error between the superheat setpoint and a superheat level of a compressor. The control module is configured to generate a control signal based on the error. The expansion valve module is configured to electronically control a state of an expansion valve based on the control signal.

Refrigeration cycle apparatus

A refrigeration cycle apparatus according to the present invention, a controller is configured to cause a first operation mode and a second operation mode to be executed as operation modes of an air-sending fan. The first operation mode is an operation mode in which an operation of the air-sending fan is started based on a first manipulation performed on an operation unit and the air-sending fan is stopped based on a second manipulation performed on the operation unit. The second operation mode is an operation mode in which the operation of the air-sending fan is started when refrigerant is detected by a refrigerant detection unit, the air-sending fan is not stopped based on the second manipulation, the air-sending fan is stopped based on a third manipulation different from the second manipulation, and the operation of the air-sending fan is restarted based on a fourth manipulation different from the first manipulation.

Gas Compressor and Method for Controlling Same

The purpose of the present invention is to provide a gas compressor that can achieve reduced fluctuation of discharge pressure during compressor body number control, and a method for controlling the gas compressor. This gas compressor includes a plurality of compressor units each having a compressor body, a motor for driving the compressor body, and an inverter for controlling a rotational speed of the motor, and a control device for controlling each of the inverters, in which discharge pipes of the compressor bodies are merged with one main discharge pipe and discharge pressure of the main discharge pipe is controlled through control of pressure of the respective discharge pipes by controlling, by means of the respective inverters, driving frequencies of the compressor bodies. The control device determines whether recovery through an increase in the driving frequency of the motor of each of the compressor bodies is possible, on the basis of the pressure value and a temporal changing amount of the discharge pressure of the main discharge pipe when the driving frequency of the motor of the compressor body is being increased but has not reached an upper limit frequency, and controls an increase of the number of the compressor bodies to be operated.

A FLUID HEATING AND/OR COOLING SYSTEM AND RELATED METHODS

A method of and system for heating and/or cooling a fluid, the method comprising moving the fluid through a secondary side of a heat exchanger and controlling the temperature of a primary side of the heat exchanger such that the temperature of the primary side of the heat exchanger is maintained substantially at a determined temperature interval from a reference temperature which is a function of at least one of: a temperature of an inlet to the secondary side and a temperature of an outlet of the secondary side. 1. A fluid heating and/or cooling system arranged to heat and/or cool a fluid and comprising:a heat pump comprising a compressor, an evaporator having an evaporating temperature at which refrigerant therein evaporates and a condenser having a condensing temperature at which refrigerant therein condenses, connected by a refrigerant pipe-work system arranged to carry a refrigerant;wherein one of the condenser and the evaporator provides a heat exchanger between the fluid and the refrigerant; (i) a primary inlet arranged, in use, to receive the refrigerant;', '(ii) a secondary inlet arranged, in use, to receive the fluid; and', '(iii) a secondary outlet arranged, in use, to output the fluid;, 'the heat exchanger havinga fluid storage vessel arranged, in use, to allow fluid therefrom to be circulated through the heat exchanger via the secondary inlet, in a heating pipe-work system;at least one temperature sensor arranged to monitor a temperature of the fluid and to generate a temperature output; anda system controller arranged to have input thereto the at least one temperature output and to generate a reference temperature from the at least one temperature input thereto, wherein the reference temperature is a function of the temperature of at least one of a secondary inlet and outlet of the heat exchanger and the controller is further arranged to control a temperature of the primary side of the heat exchanger in response to the reference temperature such that ...

Heat pump defrosting system and method

A heat pump system for conditioning regeneration air from a space is provided. The heat pump system is operable in a winter mode and/or a summer mode, and may be selectively operated in a defrost mode or cycle. During a defrost mode, hot refrigerant may be used to directly and sequentially defrost the regeneration air heat exchanger. A compressor may be configured to be overdriven during a defrost cycle.

SUPERCRITICAL REFRIGERATION CYCLE APPARATUS AND METHOD FOR CONTROLLING SUPERCRITICAL REFRIGERATION CYCLE APPARATUS

A supercritical refrigeration cycle apparatus and a method for controlling a supercritical refrigeration cycle apparatus are provided. The supercritical refrigeration cycle apparatus may include a compressor; a gas cooler configured to cool the compressed a refrigerant in a supercritical state; a pressure control electronic expansion valve connected to the gas cooler; a receiver configured to temporarily store the refrigerant; a flow control electronic expansion valve connected to an outlet side of the receiver to control a flow rate of the refrigerant; and a controller configured to control the flow control electronic expansion valve based on a suction superheat degree of refrigerant suctioned into the compressor and a target suction superheat degree, and control the pressure control electronic expansion valve based on a target operation high pressure and a current operation high pressure. In this way, flow control and pressure control of refrigerant may be respectively implemented in a separate manner, thereby enhancing reliability and operation efficiency of the compressor, respectively. 1. A supercritical refrigeration cycle apparatus , comprising:a compressor configured to compress a refrigerant in a supercritical state;a gas cooler configured to cool the compressed refrigerant;a pressure control electronic expansion valve connected to the gas cooler to control a pressure of the refrigerant;a receiver configured to temporarily store the refrigerant which has passed through the pressure control electronic expansion valve;a flow control electronic expansion valve connected to an outlet side of the receiver to control a flow rate of the refrigerant; anda controller configured to control the flow control electronic expansion valve based on a suction superheat degree of refrigerant suctioned into the compressor and a target suction superheat degree, and control the pressure control electronic expansion valve based on a target operation high pressure and a current ...

Electronic expansion valve (eev) control system and method

Systems and methods to control an electronic expansion valve (EEV) of a vapor compression system are described. A heating ventilation, and air conditioning (HVAC) system includes control circuitry having a sensor. The control circuitry sets a control setpoint of a vapor compression system such that an electronic expansion valve operates across a first operating range. The control circuitry receives a signal from the sensor indicative of an operating condition of the vapor compression system. The control circuitry adjusts the control setpoint based at least in part on the operating condition. The control circuitry controls operation of the electronic expansion valve based at least in part on the adjusted control setpoint, wherein the electronic expansion valve operates across a second operating range, different from the first operating range, at the adjusted control setpoint.

Condenser Pressure Control System and Method

A method of controlling a condenser fan of a heating, ventilating, and air-conditioning (HVAC) system based on a comparison of a refrigerant flow rate to maintain a valve position of an expansion valve. In the method, a controller modulates the condenser fan to maintain the valve position of the expansion valve at a valve position setpoint when the refrigerant flow rate is higher than the critical flow rate. The method also comprises controlling the speed of the condenser fan of the HVAC system to maintain a condensing measurement at a plurality of condensing measurement setpoints when the refrigerant flow rate is higher than the critical flow rate. The method also comprises controlling the speed of the condenser fan to maintain a condensing measurement at a plurality of condensing measurement setpoints when the condensing temperature measurement is higher than an ambient air temperature value plus at or around 5° F. 1. A method of controlling a condenser fan to maintain a valve position of an expansion valve of a heating , ventilating , and air-conditioning (HVAC) system at a valve position setpoint , said method comprising:providing a controller in communication with said expansion valve of said HVAC system, said controller operable to receive a signal indicating said valve position;providing a refrigerant flow rate sensing device in communication with said HVAC system and said controller and operable to measure a refrigerant flow rate of said HVAC system;configuring said controller with a critical flow rate value and said valve position setpoint;comparing, by said controller, said refrigerant flow rate with said critical flow rate value;modulating, by said controller, said condenser fan to maintain said valve position of said expansion valve at said valve position setpoint when said refrigerant flow rate is higher than said critical flow rate value.2. The method of claim 1 , further comprising inactivating claim 1 , by said controller claim 1 , said condenser fan ...

Refrigerant System For Cooling Electronics

The various implementations described herein include methods, devices, and systems for cooling a vehicular electronics system. In one aspect, a vehicular refrigerant system includes: (1) a refrigerant loop having a compressor configured to compress a refrigerant, a condenser configured to condense the compressed refrigerant, an expansion device configured to enable expansion of the condensed refrigerant, and a heat exchanger configured to transfer heat from a liquid coolant to the expanded refrigerant; (2) a liquid coolant loop configured to transfer heat from an electronics system via the liquid coolant; and (3) a controller configured to: (a) obtain operating data regarding the refrigerant, the liquid coolant, and/or the electronics system; and (b) adjust operation of the refrigerant loop and/or the liquid coolant loop based on the obtained operating data.

REFRIGERANT CIRCUIT COMPONENT

The refrigerant circuit component according to the invention such as a pressure sensor connected to piping of a refrigerant circuit includes a waterproof case disposed outside the pressure sensor to form an outline of the pressure sensor, a protective tube and a plurality of electric wires pulled to an outside from the waterproof case, and a wiring fixing band disposed around the waterproof case and fixing the protective tube and the plurality of electric wires, in which the waterproof case is provided with a wiring fixing band engagement structure so that deviation or release of the wiring fixing band is prevented. 1. A refrigerant circuit component connected to piping of a refrigerant circuit , the refrigerant circuit component comprising:an outer surface member disposed outside the refrigerant circuit component to form an outline of the refrigerant circuit component;at least one wire pulled to an outside from the outer surface member; anda wiring fixing band disposed around the outer surface member and fixing the at least one wire,wherein the outer surface member is provided with a wiring fixing band engagement structure so that deviation or release of the wiring fixing band is prevented.2. The refrigerant circuit component according to claim 1 , wherein the outer surface member has a cylindrical shape as a whole and the wire is pulled out from a position deviating from a center of one end portion of the outer surface member.3. The refrigerant circuit component according to claim 1 , wherein the outer surface member includes a tubular waterproof case and a lid member disposed on at least one end portion of the waterproof case.4. The refrigerant circuit component according to claim 1 , wherein the outer surface member includes a tubular waterproof case.5. The refrigerant circuit component according to claim 3 , wherein the wiring fixing band engagement structure is disposed on the waterproof case.6. The refrigerant circuit component according to claim 3 , wherein ...

HVAC Systems and Methods with Multiple-Path Expansion Device Subsystems

A heating, ventilation, air conditioning (HVAC) system includes a multi-path expansion device subsystem positioned between a condenser and an evaporator. The multi-path expansion device subsystem includes a flow selector operative to receive a refrigerant from the condenser and selectively deliver the same to a full-load pathway or to a partial-load pathway. The full-load pathway has a modulating valve and a fixed orifice sized for a full-load situation, and the partial-load pathway has a thermal expansion valve (TXV) sized for partial load operation. A controller uses an actuator of the flow selector to choose which pathway is authorized according to certain process logic. Other methods and systems are presented. 1. A method for cooling air in a heating , ventilating , and air conditioning (HVAC) system comprising: moving refrigerant through a closed refrigeration circuit having a compressor , a condenser , an expansion device subsystem , and an evaporator; wherein the expansion device subsystem comprises a full-load pathway and at least one partial-load pathway and a flow selector for directing refrigerant flow from the condenser to either the partial-load pathway or the full-load pathway; measuring a refrigerant pressure on a high-pressure side of the closed refrigeration circuit; directing refrigerant flow from the condenser to the full-load pathway when the refrigerant pressure is greater than or equal to a first preselected activation pressure and stepping down a refrigerant pressure with a set orifice; directing refrigerant flow from the condenser to the partial-load pathway when the refrigerant pressure is less than a second preselected activation pressure and stepping down a refrigerant pressure with a variable expansion device configured for partial loads; and delivering refrigerant from the full-load pathway or partial-load pathway to the evaporator.2. The method of claim 1 , wherein the condenser comprises a micro-channel condenser.3. The method of claim ...

Heat exchanger and method for controlling or regulating the heat exchanger

A heat exchanger, in particular a chiller, includes a heat exchanger block with a first fluid duct for a refrigerant and a second fluid duct for a coolant, an inlet and an outlet for the refrigerant, which are formed at a connecting flange and which are fluidically connected to the first fluid duct, a sensor for detecting a measured variable of the refrigerant, and an electronic expansion valve arranged in the inlet including an integrated regulating unit, wherein the expansion valve regulates a flow rate of the refrigerant in the inlet as a function of the detected measured variable. The sensor and the regulating unit are connected via a cable to transfer data. A port is formed at the expansion valve. The cable is further secured releasably or non-releasably in the respective port at the expansion valve. In addition, a method for controlling or regulating the heat exchanger is provided.

REFRIGERATION CYCLE APPARATUS

A refrigeration cycle apparatus includes a refrigerant circuit that includes a condenser, multiple temperature sensors that are disposed in line in a direction in which refrigerant flows in the condenser and detect refrigerant temperature of the condenser, a memory unit that stores positional information of the multiple temperature sensors, and a refrigerant amount calculation unit that calculates a refrigerant amount of the condenser based on the positional information of the multiple temperature sensors, detected temperatures of the multiple temperature sensors and a saturated liquid temperature of the refrigerant. 1. A refrigeration cycle apparatus comprising:a refrigerant circuit including a condenser;a plurality of temperature sensors each disposed in line in a direction in which refrigerant flows in the condenser and configured to detect refrigerant temperature of the condenser;a memory unit configured to store positional information of the plurality of temperature sensors; anda refrigerant amount calculation unit configured to calculate a refrigerant amount of the condenser based on the positional information of the plurality of temperature sensors, detected temperatures of the plurality of temperature sensors and a saturated liquid temperature of the refrigerant.2. The refrigeration cycle apparatus of claim 1 , wherein the refrigerant amount calculation unit is configured to estimate a length of a liquid phase part in the condenser based on the positional information of the plurality of temperature sensors claim 1 , the detected temperatures of the plurality of temperature sensors and the saturated liquid temperature of the refrigerant.3. The refrigeration cycle apparatus of claim 2 , wherein the refrigerant amount calculation unit is configured to obtain a volumetric proportion or a volumetric capacity of the liquid phase part in the condenser from the length of the liquid phase part in the condenser claim 2 , and calculate the refrigerant amount of the ...

LIQUID FEEDER

A liquid feeder includes a pump which is prevented from idling, and a replenisher including a cylinder that is a bottomed tube including an opening on a side adjacent to a communication flow path, the opening being connected to the communication flow path, and that is capable of accommodating a liquid in at least a portion of the cylinder, a seal that is housed in the cylinder in a movable manner along the cylinder, and seals the liquid in the cylinder, and a pressurizer to pressurize the seal toward a pump chamber. 1. A liquid feeder comprising:a pump; anda replenisher;{'claim-text': ['an inflow port into which a liquid flows;', 'an outflow port from which the liquid having flowed in from the inflow port flows out;', 'a communication flow path that communicates between the inflow port and the outflow port;', 'a pump to circulate the liquid; and', 'a pump chamber located midway in the communication flow path and in which the pump is provided;'], '#text': 'the pump including:'}the replenisher including:a cylinder that is a bottomed tube including an opening on a side adjacent to the communication flow path, the opening being connected to the communication flow path, and that is capable of accommodating the liquid in at least a portion of the cylinder;a seal that is housed in the cylinder in a movable manner along the cylinder, and seals the liquid in the cylinder; anda pressurizer to pressurize the seal toward the pump chamber.2. The liquid feeder according to claim 1 , wherein the pressurizer includes a spring between a bottom of the cylinder and the seal.3. The liquid feeder according to claim 2 , wherein a hole is opened in the bottom of the cylinder.4. The liquid feeder according to claim 1 , further comprising an auxiliary tank that is connected to an upstream flow path located between the inflow port and the pump chamber in the communication flow path and is adjacent to the pump chamber.5. The liquid feeder according to claim 4 , wherein the cylinder includes:a ...

Single-pipe thermal energy system

Thermal energy systems for managing, distribution and recovery of thermal energy. A single-pipe loop circulating a two-phase refrigerant is provided. The single-pipe loop is spread through the entire system and interconnects a plurality of local heat exchange stations, each having different thermal energy loads. A central circulation mechanism (CCM) is also provided for circulating the refrigerant for distribution of thermal energy within the system.

METHOD FOR AIR-CONDITIONING OF ENVIRONMENTS IN THE MARINE FIELD

A method for air-conditioning of watercraft and the like comprising the use of a device with: an electronically controlled variable-r.p.m. compressor, a main gas/water condenser (), at least one environmental heat-exchanger () with an electronically controlled fan (), at least one electronically controlled expansion valve (), and at least one first electronic control unit () programmed for calculating continuously a temperature deviation detected (DeltaT=T_ad-T_a), and as a function of said temperature deviation regulating in combination, the r.p.m. of the compressor (), opening of the flow valve (), and the r.p.m. of the fan of the heat-exchanger (). 1. A method for air-conditioning of watercraft by means of an apparatus of the type comprising:{'b': 1', '10', '19, 'an electronically controlled variable-r.p.m. compressor () for compression of a mass of a phase-change working fluid, supplied by a line () of fluid in the gaseous phase and communicating with a duct () for outlet of a flow of the fluid in the form of compressed gas;'}{'b': 5', '60', '23', '18', '6', '11, 'a main gas/water condenser (, ) communicating with a duct () carrying fluid in the gaseous phase, with a duct for passage of a flow of water () delivered by a purposely provided electronically controlled variable-r.p.m. pump (), and with a line () of fluid in the liquid phase;'}{'b': 3', '13', '11', '10', '13', '13', '15', '16', '14, 'at least one environmental heat-exchanger () comprising one or more evaporation/condensation thermal batteries () communicating with said line () of working fluid in the liquid phase and with said line () of working fluid in the gaseous phase, and provided with evaporation/condensation thermal batteries () (, , ) for thermal conditioning of a flow of air emitted by an electronically controlled fan ();'}{'b': 9', '10', '1', '5, 'an electronically controlled four-way valve () in communication with said gas line (), with the inlet and the outlet of said compressor (), and ...

APPARATUS FOR AIR-CONDITIONING OF ENVIRONMENTS IN THE MARINE FIELD

An apparatus for air-conditioning of watercraft and the like comprising: an electronically controlled variable-r.p.m. compressor, a main gas/water condenser (), at least one environmental heat-exchanger () with an electronically controlled fan (), at least one electronically controlled expansion valve (), and at least one first electronic control unit () programmed for calculating continuously a temperature deviation detected (DeltaT=T_ad−T_a), and as a function of said temperature deviation regulating in combination, the r.p.m. of the compressor (), opening of the flow valve (), and the r.p.m. of the fan of the heat-exchanger (). 1. A heat-exchanger for exchange of heat between water and a phase-change working coolant , comprising:{'b': 30', '23', '1, 'a tube-nest heat-exchange unit () in thermal contact with a flow of water, set between a line () of flow of working fluid in the gaseous phase for connection with a compressor and a line () of flow of working fluid in the liquid phase;'}{'b': 8', '11', '30, 'an electronically regulated flow valve () set along said line of flow () in the proximity of said heat-exchange unit ();'}{'b': '32', 'at least one sensor () for detection of the condensation/evaporation temperature of the working fluid;'}{'b': 6', '18, 'an electronically controlled water pump () for regulating the rate of the flow of water coming from a source of water (); and'}{'b': 40', '32', '8', '6, 'an electronic control unit () operatively connected to said sensor (), to said valve (), and to said pump () for regulating the flow of coolant and of water on the basis of a difference in temperature between the temperature detected and a desired optimal condensation/evaporation temperature of the working fluid.'}23334. The heat-exchanger according to claim 1 , further comprising internal and/or external means ( claim 1 , ) for accumulating the working fluid treated and condensed at the desired temperature in order to create a thermal flywheel that optimizes ...

Variable speed drive for a hvac&r system

Embodiments of the present disclosure relate to a heating, ventilating, air conditioning, and refrigeration (HVAC&R) system that includes a variable speed drive configured to provide power to a motor that drives a compressor of the HVAC&R system and a silicon carbide transistor of the variable speed drive, where the silicon carbide transistor is configured to adjust a voltage, or a frequency, or both of power flowing through the variable speed drive.

Container refrigeration device

A container refrigeration device includes: a fan controller which reduces a rotation speed of an inside fan when a temperature inside a container is stabilized; and a rotation speed controller which reduces an operational rotation speed N of a compressor such that the temperature inside the container becomes equal to a target temperature as the fan controller reduces the rotation speed of the inside fan.

Cryogenic refrigeration system

Provided is a cryogenic refrigeration system. The cryogenic refrigeration system includes a cryogenic refrigerator, and a heat dissipation module configured to cool the cryogenic refrigerator. Here, the heat dissipation module includes a condenser configured to condense a refrigerant that cools the cryogenic refrigerator, and a heat exchanger connected to the cryogenic refrigerator to circulate the refrigerant between the cryogenic refrigerator and the condenser, thereby cooling the cryogenic refrigerator.

System and Method for Injecting Oil into an Air Conditioning Circuit

An air conditioning service system includes an oil receptacle, a coupling port in fluid communication with the oil receptacle through an oil injection line, a solenoid valve configured to selectively allow the oil to flow from the oil receptacle into the oil injection line, a memory including program instructions stored therein, and a controller operably connected to the solenoid valve and the memory. The controller is configured to execute the program instructions to obtain at least one viscosity signal associated with a viscosity of the oil, obtain a volume signal indicative of an amount of oil to be charged, determine a time period based upon the obtained at least one viscosity signal and the obtained volume signal, control the solenoid valve to an open condition, and control the solenoid valve to a closed condition after the determined time period has passed since opening of the solenoid valve.

LNG GASIFICATION SYSTEMS AND METHODS

A skid for capturing refrigeration from liquefied natural gas vaporization is disclosed comprising a first heat exchanger mounted on the skid, the first heat exchanger having a natural gas inlet, a natural gas outlet, a process fluid inlet, and a process fluid outlet. The process fluid is configured to flow from the process fluid inlet through the first heat exchanger to the process fluid outlet and then to the process fluid inlet. Other embodiments of the system for capturing refrigeration from vaporization of liquid natural gas, and methods for its use, are described herein. 1. A method for capturing refrigeration comprising:providing a predetermined flowrate of liquefied natural gas to a first heat exchanger;providing a process fluid to the first heat exchanger, wherein the process fluid is warmer than the liquefied natural gas;heating at least a portion of the liquefied natural gas with at least a portion of the process fluid;calculating an amount of energy transferred in the first heat exchanger from the process fluid to the liquefied natural gas;utilizing the process fluid for cooling.2. The method of claim 1 , further comprising displaying on a user display the amount of energy transferred in the first heat exchanger from the liquefied natural gas to the process fluid.3. The method of claim 1 , further comprising changing the predetermined flowrate of liquefied natural gas to the first heat exchanger based on the temperature of process fluid entering the heat exchanger.4. The method of claim 1 , further comprising changing the predetermined flowrate of liquefied natural gas to the first heat exchanger based on the temperature of process fluid leaving the heat exchanger.5. The method of claim 1 , further comprising:calculating an amount of energy of the liquefied natural gas;adding the calculated amount of energy transferred in the first heat exchanger from the process fluid to the liquefied natural gas to the calculated amount of energy of the liquefied ...

SYSTEM FOR CALIBRATION OF A COMPRESSOR UNIT IN A HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM

The present invention provides for a system for calibrating operation of a compressor unit in a heating, ventilation, and air conditioning (HVAC) system. A measuring device measures an operating parameter of the HVAC system at a position where the measuring device is mounted on a refrigerant line of the HVAC system. The measuring device switches states when the value of the measured operating parameter reaches a switching value. A controller estimates a value of the first operating parameter at the position where the first measuring device is mounted on the refrigerant line, and the controller determines whether the estimated first operating parameter is within a threshold percentage of the switching value. 1. A method for calibrating operation of a compressor unit in a heating , ventilation , and air conditioning (HVAC) system , the method comprising:measuring, using a pressure switch mounted on a discharge line of the compressor unit, refrigerant pressure in the discharge line;determining, using a controller, whether the measured refrigerant pressure reaches a first switching value;responsive to a positive determination, switching from a first state to a second state;estimating, using the controller, a first estimated value of the measured refrigerant pressure; anddetermining, using the controller, whether the first estimated value is within a first threshold percentage of the first switching value.2. The method of claim 1 , wherein the discharge line comprises a channel for refrigerant flow.3. The method of claim 1 , further comprising:generating, by the controller, a first communication based on the determination of whether the first estimated value is within the first threshold percentage of the first switching value.4. The method of claim 3 , further comprising:sending, by the controller, the first communication using a wireless connection with an external device.5. The method of claim 3 , further comprising:determining, using the controller, whether the ...

Defrost Control Using Fan Data

In various implementations, frost in a vapor compression system may be controlled. A property of a fan may be determined. A determination may be made whether a frost event and/or a nonfrost event has occurred based at least partially on the determined fan property. 1. A method of distinguishing between a frost condition and a nonfrost condition in a vapor compression system , the method comprising:determining a change in a fan property;determining a time period in which the change in the fan property occurred;determining if an event has occurred based at least partially on the change in the fan property and the time period;determining that the event is a frost condition if the time period is within a predetermined frost period of time;determining that the event is a slow nonfrost condition if the time period is greater than a predetermined slow amount of time;determining that the event is a sudden nonfrost condition if the time period is less than a predetermined sudden amount of time; andinitiating a defrost cycle if the event is a frost condition.2. The method of further comprising allowing the vapor compression system to operate in response to a request.3. The method of wherein the fan property comprises fan speed claim 1 , air flow rate claim 1 , external static pressure claim 1 , input power claim 1 , change in fan speed claim 1 , change in air flow rate claim 1 , change in external static pressure claim 1 , or change in input power.4. The method of wherein the one or more fan properties comprises temperature.5. The method of wherein the nonfrost condition comprises soiling of a heat exchanger coil in the vapor compression system.6. The method of wherein the fan property comprises a temperature.7. The method of wherein the fan property comprises a change in pressure.8. A vapor compression system comprising:a fan;sensors that measure one or more system properties, the one or more system properties comprising at least a change in a fan property and a time period ...

START-STOP CONTROL SYSTEMS AND METHODS FOR GAS FOIL BEARING MACHINE

An HVAC system includes an unloading device, a centrifugal compressor, a gas foil bearing, a VFD and a controller. The controller is programmed to start the centrifugal compressor from a stopped condition by operating the unloading device to remove a load from the centrifugal compressor, accelerating the motor to a first speed above a liftoff speed of the gas foil bearing and below an operating speed of the centrifugal compressor, running the motor for a period of time, operating the unloading device to apply the load to the centrifugal compressor, and accelerating the motor to the operating speed. 1. An HVAC system comprising:an unloading device; and a compressor housing;', 'a motor having a driveshaft rotatably supported within the compressor housing;', 'an impeller connected to the driveshaft and operable to compress refrigerant gas upon rotation of the driveshaft;', 'a gas foil bearing supported by the compressor housing and supporting the driveshaft; and', operating the unloading device to remove a load from the centrifugal compressor,', 'accelerating the motor to a first speed above a liftoff speed of the gas foil bearing and below an operating speed of the centrifugal compressor,', 'running the motor at the first speed for a period of time,', 'operating the unloading device to apply the load to the centrifugal compressor, and', 'accelerating the motor to the operating speed., 'start the centrifugal compressor from a stopped condition by, 'a controller connected to the motor and the unloading device, the controller programmed to], 'a centrifugal compressor comprising2. The HVAC system of claim 1 , wherein the controller is further programmed to stop the centrifugal compressor from an operating condition by:operating the unloading device to remove a load from the centrifugal compressor,decelerating the motor toward a minimum speed greater than zero, andremoving power from the motor when the speed of the motor reaches the minimum speed and allowing the motor to ...

HEAT PUMP

An exemplary heat pump () includes: a compressor (A, B) that discharges refrigerant; an oil separator () that separates oil from the refrigerant discharged from the compressor; an oil return channel () that returns the oil separated by the oil separator to the compressor; a pressure sensor (A, B) that detects a pressure in the oil return channel; a first pressure loss member (A, B) and a second pressure loss member (A, B) disposed in portions of the oil return channel at an oil separator side and a compressor side relative to the pressure sensor; and a control device that increases an output of the compressor in a case where a pressure detected by the pressure sensor exceeds a suction pressure of the compressor and less than a discharge pressure of the compressor. 1a compressor configured to compress refrigerant and discharge the compressed refrigerant;an oil separator configured to separate oil from the compressed refrigerant discharged from the compressor;an oil return channel configured to return the oil separated by the oil separator to the compressor;a pressure sensor configured to detect a pressure at a location in the oil return channel; the first pressure loss member is upstream of the location; and', 'the second pressure loss member is downstream of the location;, 'first and second pressure loss members disposed in or defining portions of the oil return channel, whereina shut-off valve configured to selectively block fluid communication between the oil separator and the first pressure loss member; anda control device configured to control the compressor to increase an output of the compressor when a pressure detected by the pressure sensor exceeds a suction pressure of the compressor and is less than a discharge pressure of the compressor.. A heat pump comprising: The present invention relates to a heat pump.In a heat pump that has been known to date, an oil separator collects refrigerating machine oil (oil) included in refrigerant discharged from a ...

Variable Speed Compressor Protection System And Method

A system and method for a compressor includes a compressor connected to a condenser, a discharge line temperature sensor that outputs a discharge line temperature signal corresponding to a discharge line temperature of refrigerant leaving the compressor, and a control module connected to the discharge line temperature sensor. The control module determines a saturated condenser temperature, calculates a discharge superheat temperature based on the saturated condenser temperature and the discharge line temperature, and monitors a flood back condition of the compressor by comparing the discharge superheat temperature with a predetermined threshold. The control module increases a speed of the compressor when the discharge superheat temperature is less than or equal to the predetermined threshold. 1. A system comprising:a compressor connected to a condenser;a discharge line temperature sensor that outputs a discharge line temperature signal corresponding to a discharge line temperature of refrigerant leaving the compressor;a control module connected to the discharge line temperature sensor, said control module determining a saturated condenser temperature, calculating a discharge superheat temperature based on the saturated condenser temperature and the discharge line temperature, monitoring a flood back condition of the compressor by comparing the discharge superheat temperature with a predetermined threshold, and, when the discharge superheat temperature is less than or equal to the predetermined threshold, increasing a speed of the compressor.2. The system of wherein the predetermined threshold is thirty degrees Fahrenheit.3. The system of wherein the control module increases the speed of the compressor when the discharge superheat temperature is less than or equal to the predetermined threshold.4. The system of wherein the control module decreases an opening of an expansion valve associated with the compressor when the discharge superheat temperature is less than or ...

ADAPTIVELY CONTROLLED DEFROST CYCLE TIME FOR AN AIRCRAFT VAPOR CYCLE REFRIGERATION SYSTEM

A defrost cycle time of an aircraft vapor cycle refrigeration system is adaptively controlled. A pressure of refrigerant at an inlet of a compressor of the vapor cycle refrigeration system is sensed. A defrost cycle of the vapor cycle refrigeration system is initiated in response to the sensed pressure being less than a threshold pressure. The defrost cycle is terminated upon expiration of the defrost cycle time. The defrost cycle time is based upon a time duration of the cooling cycle. 1. A method comprising:(a) initiating a cooling cycle of a vapor cycle refrigeration system of an aircraft;(b) sensing a pressure of refrigerant at an inlet of a compressor of the vapor cycle refrigeration system during operation of the cooling cycle;(c) initiating a defrost cycle of the vapor cycle refrigeration system in response to the sensed pressure being less than a threshold pressure;(d) terminating the defrost cycle upon expiration of a defrost cycle time that is based upon a time duration of the cooling cycle; and(e) repeating steps (a)-(d).2. The method of claim 1 , further comprising:adjusting the defrost cycle time based on the time duration of the cooling cycle.3. The method of claim 2 ,wherein adjusting the defrost cycle time based on the time duration of the cooling cycle comprises increasing the defrost cycle time in response to determining that the time duration of the cooling cycle is less than a threshold time duration.4. The method of claim 2 ,wherein adjusting the defrost cycle time based on the time duration of the cooling cycle comprises decreasing the defrost cycle time in response to determining that the time duration of the cooling cycle is greater than a threshold time duration.5. The method of claim 2 ,wherein adjusting the defrost cycle time based on the time duration of the cooling cycle comprises adjusting the time duration of the cooling cycle by an amount that is proportional to a difference between a threshold time duration and the time duration of ...

CARBON DIOXIDE COOLING SYSTEM WITH SUBCOOLING

A subcooling controller includes a sensor and a processor. The sensor measures one or more of a temperature external to a first heat exchanger that removes heat from carbon dioxide refrigerant, a temperature of the carbon dioxide refrigerant, and a pressure of the carbon dioxide refrigerant. The processor determines that one or more of the measured temperature external to the first heat exchanger, the temperature of the carbon dioxide refrigerant, and the pressure of the carbon dioxide refrigerant is above a threshold and in response to that determination, activates a subcooling system. The subcooling system includes a condenser, a second heat exchanger, and a compressor. The condenser removes heat from a second refrigerant. The second heat removes heat from the carbon dioxide refrigerant stored in a flash tank. The compressor compresses the second refrigerant from the second heat exchanger and sends the second refrigerant to the condenser. 1. A subcooling controller comprising: a temperature external to a first heat exchanger configured to remove heat from carbon dioxide refrigerant, the first heat exchanger further configured to send the carbon dioxide refrigerant to a flash tank;', 'a temperature of the carbon dioxide refrigerant; and', 'a pressure of the carbon dioxide refrigerant; and, 'a sensor configured to measure one or more of determine that one or more of the measured temperature external to the first heat exchanger, the measured temperature of the carbon dioxide refrigerant, and the measured pressure of the carbon dioxide refrigerant is above a threshold;', a condenser configured to remove heat from a second refrigerant;', 'a second heat exchanger coupled to the flash tank, the second heat exchanger configured to receive the second refrigerant from the condenser, the second heat exchanger further configured to remove heat from the carbon dioxide refrigerant stored in the flash tank; and', 'a compressor configured to compress the second refrigerant from ...

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.

CONTROL VALVE

A control valve of an embodiment includes a disc coaxially in contact with a diaphragm, and a shaft configured to transmit a drive force in an axial direction caused by displacement of the diaphragm to a valve element. The diaphragm has a corrugated portion between a flat portion and the outer peripheral portion, the flat portion having a contact surface with which the disc is in contact. The corrugated portion includes substantially N+0.5 corrugations (N being a natural number) each protruding relative to a reference surface, the corrugations being formed between the outer peripheral portion and the flat portion, the reference surface being one surface of the outer peripheral portion. A height of each of the N corrugations of the corrugated portion is smaller than a height of the flat portion, the heights each being a height relative to the reference surface in an unloaded condition. 1. A control valve comprising:a body having an inlet port through which a fluid is introduced, an outlet port through which the fluid is delivered, a valve hole in a fluid passage connecting the inlet port and the outlet port, and a pressure chamber separated from the fluid passage by a partition;a valve element disposed in the fluid passage and configured to move toward and away from the valve hole to adjust an opening degree of a valve section;a power element including a housing forming the pressure chamber between the body and the housing, and a diaphragm having an outer peripheral portion supported by the housing and partitioning an inside of the housing into a closed space separated from the pressure chamber and an open space being open toward the pressure chamber;a disc disposed in the open space and coaxially in contact with the diaphragm; anda shaft extending through the partition and slidably supported in an axial direction thereof, having a first end connected with the diaphragm via the disc and a second end connected with the valve element, and being configured to transmit a ...

APPARATUS AND METHOD FOR HYBRID WATER HEATING AND AIR COOLING AND CONTROL THEREOF

A system for conditioning air circulated from an interior of a building includes a refrigerant path, an air-cooled condenser in the refrigerant path, a water-cooled condenser in the refrigerant path that transfers heat from refrigerant in the refrigerant path to the building water, an evaporator in the refrigerant path, and a control system. The control system moves the system between operation of the air-cooled condenser and the water-cooled condenser based upon predetermined system conditions. 1. A system for conditioning air and for heating water , comprising:a first refrigerant path;a second refrigerant path that is independent of the first refrigerant path;a first condenser in the first refrigerant path and the second refrigerant path and disposed in an air flow so that the first condenser transfers heat to air in the air flow path from refrigerant in the first refrigerant path that moves through the first condenser and transfers heat to the air from refrigerant in the second refrigerant path that moves through the first condenser;a second condenser in the first refrigerant path and that defines a water flow path so that the second condenser transfers heat to water in the water flow path from the refrigerant in the first refrigerant path that moves through the second condenser; anda control system in operative communication with the first refrigerant path and configured to direct the refrigerant in the first refrigerant path, in a first state of the first refrigerant path, to the first condenser and not to the second condenser and, in a second state of the first refrigerant path, to the second condenser,wherein the control system is configured to determine a condition under which the system activates the first refrigerant path and deactivates the second refrigerant path and to move the first refrigerant path from the second state to the first state responsively to the condition.2. The system as in claim 1 , wherein the condition is a level of a pressure in the ...

Apparatus and method for hybrid water heating and air cooling and control thereof

A system for conditioning air circulated from an interior of a building includes a refrigerant path, an air-cooled condenser in the refrigerant path, a water-cooled condenser in the refrigerant path that transfers heat from refrigerant in the refrigerant path to the building water, an evaporator in the refrigerant path, and a control system. The control system moves the system between operation of the air-cooled condenser and the water-cooled condenser based upon predetermined system conditions.

Expansion valve setpoint control systems and methods

A system includes an error module configured to integrate a difference between a superheat signal and a superheat setpoint to generate an error signal, wherein the superheat signal indicates suction superheat values of a compressor. A comparison module is configured to compare the error signal to a first predetermined threshold to generate a first comparison signal based on the comparison. A zero-crossing module is configured to compare a first count value to a second predetermined threshold to generate a second comparison signal. The first count value is generated based on at least one comparison between the superheat signal and the superheat setpoint. A setpoint module is configured to adjust the superheat setpoint based on the first comparison signal and the second comparison signal.

Systems and Methods for Operating a Refrigeration System

Methods and systems for operating a refrigeration system for refrigerating a product are provided. A first temperature of the refrigerant downstream of a condenser and upstream of an evaporator may be obtained. A first pressure of the refrigerant downstream of the condenser and upstream of the evaporator may be obtained. A second pressure of the refrigerant downstream of the evaporator and upstream of a compressor and/or a temperature of the product being refrigerated may be obtained. A first valve, disposed between the condenser and the evaporator, may be controlled based on the first temperature and the first pressure to maintain a pre-determined cooling set-point for the refrigeration system. A second valve of the refrigeration system, coupled to the compressor, may be controlled based on the second pressure or the temperature of the product to optimize a capacity of a compressor of the refrigeration system.

MULTI-SPLIT SYSTEM AND LIQUID RETURN PREVENTION CONTROL METHOD THEREOF DURING DEFROSTING OF MULTI-SPLIT SYSTEM

A multi-split system and a liquid return prevention control method thereof during defrosting of the multi-split system. The method includes the following steps: when the multi-split system is in heating operation, detecting gas exhaust pressure (PC), gas return pressure (PE) and gas exhaust temperature (TP) of a compressor in real time; if an outdoor unit receives a defrosting instruction, sending a defrosting signal to a diverter and heating indoor units in multiple indoor units, controlling, by means of the diverter, a throttling element (EXV) to close before first reversing of a four-way valve and last for a pre-set time, so as to reduce the amount of a refrigerant returned to the outdoor unit; and regulating the opening of the throttling element (EXV) according to the gas exhaust pressure (PC), gas return pressure (PE) and gas exhaust temperature (TP) during defrosting operation of the multi-split system, so that the risk of liquid return occurred to the compressor during a defrosting process, and the safety and reliability of the system are greatly improved. 1. A control method of anti-liquid-return of a multi-split air conditioning system during defrosting , wherein the multi-split air conditioning system comprises an outdoor unit , a shunt device and a plurality of indoor units , wherein the shunt device comprises a first heat exchanging component , a second heat exchanging component , a throttling element disposed between an outlet of a first heat exchanging channel of the second heat exchanging component and an inlet of a second heat exchanging channel of the second heat exchanging component , an outlet of a first heat exchanging channel of the first heat exchanging component is communicated with an inlet of the first heat exchanging channel of the second heat exchanging component , an inlet of a second heat exchanging channel of the first heat exchanging component is communicated with an outlet of the second heat exchanging channel of the second heat ...

METHOD AND DEVICE FOR COOL-DRYING A GAS WITH CIRCULATING COOLING LIQUID WITH BYPASS LINE

Method for cool drying gas, whereby the cool dryer is characterised by curves that show the setpoint for the evaporator temperature or evaporator pressure for a load as a function of the lowest gas temperature, whereby the method comprises the following steps:—the determination of a curve and Tset or pset as a function of the load that is required to cool the gas to LATset; the control of a supply of coolant from the compressor to an injection point (P) downstream from the expansion means and upstream from the compressor in order to make the evaporator temperature or evaporator pressure equal to Tset or pset. 130-. (canceled)31. A method for cool drying a gas whereby water vapour in the gas is condensed by guiding the gas through the secondary section of a heat exchanger whose primary section forms the evaporator of a closed cooling circuit in which a coolant can circulate by means of a compressor that is installed in the cooling circuit downstream from the evaporator and which is followed by a condenser and expansion means through which the coolant can circulate , whereby the cool dryer is characterised by a series of curves that show the setpoint for the evaporator temperature or evaporator pressure for a certain load of the cooling circuit as a function of the desired lowest gas temperature , comprising the following steps:determining the evaporator temperature and/or the evaporator pressure;determining the load of the cooling circuit;determining a corresponding curve as a function of the specific load, and for this curve the determination of the setpoint for the evaporator temperature or evaporator pressure that is required to be able to cool the gas to be dried to a desired lowest gas temperature;controlling a supply of coolant from the outlet of the compressor to an injection point in the cooling circuit downstream from the expansion means and upstream from the compressor in order to make the evaporator temperature or evaporator pressure equal or practically ...

Ejector refrigeration circuit

An ejector refrigeration circuit comprises: a high pressure ejector circuit comprising in the direction of flow of a circulating refrigerant: a heat rejecting heat exchanger/gas cooler having an inlet side and an outlet side; at least one ejector comprising a primary high pressure input port, a secondary low pressure input port, and an output port, the primary high pressure input port being fluidly connected to the outlet side of the heat rejecting heat exchanger/gas cooler; a receiver, having a liquid outlet, a gas outlet and an inlet, which is fluidly connected to the output port of the at least one ejector; at least one compressor having an inlet side and an outlet side, the inlet side of the at least one compressor being fluidly connected to gas outlet of the receiver.

System for control of superheat setpoint for hvac system

A refrigeration system includes a variable capacity compressor system configured to pressurize refrigerant within a refrigerant circuit and a controller configured to receive data indicative of an operating capacity of the variable capacity compressor system and configured to adjust a superheat target setpoint of the refrigerant within the refrigerant circuit based on the data.

Gas-liquid separator and air conditioner including the same

In an air conditioner, an inlet pipe penetrates a location that is offset towards an outer circumferential side from an apex portion of a top portion. The suction pipe penetrates a location that is offset towards the outer circumferential side from an apex portion of a bottom portion and is inserted into the interior of the main body portion, and the suction inner pipe, which constitutes a portion of the suction pipe that lies in the interior of the main body portion, extends as far as an upper portion of the main body portion so that an inlet port is disposed in a space defined by the top portion. Then, the suction inner pipe includes a bend portion that is bent from a location lying slightly above a location where the suction pipe penetrates the bottom portion as an originating point.

Expansion device and refrigeration cycle apparatus

Provided is an expansion device configured to form a refrigerant circuit using refrigerant containing a substance having such a property as to cause a disproportionation reaction, the expansion device including: a valve body having a cylindrical shape; and an expansion unit including a valve seat, the expansion unit being configured to vary an opening area by insertion of the valve body into the valve seat through movement of the valve body in an axial direction thereof, in which: a distal end portion of the valve body to be inserted into the expansion unit is formed to have an angle larger than 0 from a direction perpendicular to the axial direction of the valve body.

Termperature Control Logic For Refrigeration System

A refrigeration system includes a compressor having a first stage ( 20 a ) and a second stage ( 20 b ); a motor ( 22 ) driving the compressor; a heat rejecting heat exchanger having a fan ( 44 ) drawing ambient fluid over the heat rejecting heat exchanger, the heat rejecting heat exchanger including an intercooler ( 43 ) and a gas cooler, the inter-cooler coupled to an outlet of the first stage and the gas cooler ( 41 ) coupled to an outlet of the second stage; a flash tank ( 70 ) coupled to an outlet of the gas cooler; a primary expansion device ( 55 ) coupled to an outlet of the flash tank; a heat absorbing heat exchanger ( 50 ) coupled to an outlet of the primary expansion device, an outlet of the heat absorbing heat exchanger coupled to the suction port of the first stage; and a controller ( 100 ) for implementing a pulldown mode, a control mode and a staging logic mode.

DEVICE FOR SEPARATING OIL FROM A REFRIGERANT FLUID

A device () for separation of oil particles by a coolant for air conditioning systems comprises a hollow container body () and an inlet () arranged to let enter the hollow container body () a coolant with oil particles, mainly in liquid phase and having a temperature Ti. The device () also comprises an outlet () located at the top wall and arranged to cause regenerated coolant in vapor phase to exit from the hollow container body (). An heating coil () is also provided arranged in the hollow container body () and containing fluid at a temperature T>>T, in such a way that the coolant evaporates when it comes in contact with the heating coil () and the oil particles can fall towards the bottom wall. The device () also comprises a first oil barrier () between said heating unit and said outlet () and arranged to prevent said oil particles to splash towards said outlet (), said first oil barrier () arranged at a distance L from said top wall. A second oil barrier is also provided located in the hollow container body () at the outlet (), said second oil barrier () comprising holes having a diameter of a predetermined value D configured to prevent that oil particles having diameter larger than the predetermined value D pass through the outlet (). 1100100. A device () for separation of oil particles by a coolant for air conditioning systems , said device () comprising:{'b': '110', 'a hollow container body () defined by a top wall and a bottom wall;'}{'b': 111', '110, 'sub': '1', 'an inlet () arranged to let enter said hollow container body () a coolant with oil particles, said coolant being mainly in liquid phase and having a temperature T;'}{'b': 112', '110, 'an outlet () located at said top wall and arranged to cause regenerated coolant in vapor phase to exit from said hollow container body ();'}{'b': '110', 'sub': 2', '1, 'a heating unit, in said hollow container body (), arranged to heat said coolant at a temperature T>>T, in such a way that said coolant evaporates when ...

Refrigeration System With Superheating, Sub-Cooling and Refrigerant Charge Level Control

The various embodiments described herein include methods, devices, and systems for determining refrigerant charge level. In one aspect, a refrigeration system includes: (1) a compressor to compress a refrigerant; (2) a condenser disposed downstream of the compressor to condense the refrigerant; (3) an evaporator disposed downstream of the condenser to vaporize the refrigerant; (4) refrigerant lines fluidly connecting the compressor, the condenser and the evaporator in series to form a refrigerant circuit for circulating the refrigerant; (5) at least one sensor configured to measure temperature and pressure of the refrigerant in the refrigerant circuit; and (6) a controller communicatively coupled to the at least one sensor and configured to: (a) determine a sub-cooling level or super-heating level based on the temperature and/or pressure measured by the at least one sensor; and (b) facilitate operation of the refrigeration system based on the sub-cooling level or the super-heating level. 1. A refrigeration system , comprising:a compressor to compress a refrigerant;a condenser disposed downstream of the compressor to condense the refrigerant;an evaporator disposed downstream of the condenser to vaporize the refrigerant;refrigerant lines fluidly connecting the compressor, the condenser and the evaporator in series to form a refrigerant circuit for circulating the refrigerant;at least one sensor configured to measure a temperature of the refrigerant and a pressure of the refrigerant in the refrigerant circuit; and determine a sub-cooling level or super-heating level based on the temperature and/or the pressure measured by the at least one sensor; and', 'facilitate operation of the refrigeration system based on the sub-cooling level or the super-heating level., 'a controller communicatively coupled to the at least one sensor and configured to2. The system of claim 1 , further comprising a receiver drier disposed between the condenser and the evaporator claim 1 , the ...

Energy Management For Refrigeration Systems

A system and method are provided including a system controller for a refrigeration or HVAC system having a compressor rack with a compressor and a condensing unit with a condenser fan. The system controller monitors and controls operation of the refrigeration or HVAC system. A rack controller monitors and controls operation of the compressor rack and determines compressor rack power consumption data. A condensing unit controller monitors and controls operation of the condensing unit and determines condensing unit power consumption data. The system controller receives the compressor rack power consumption data and the condensing unit power consumption data, determines a total power consumption of the refrigeration or HVAC system, determines a predicted power consumption or a benchmark power consumption for the refrigeration system, compares the total power consumption with the predicted power consumption or the benchmark power consumption, and generates an alert based on the comparison. 1. A system comprising:a system controller for a refrigeration or HVAC system having a compressor rack with at least one compressor and a condensing unit with at least one condenser fan, the system controller monitoring and controlling operation of the refrigeration or HVAC system;a rack controller in communication with the system controller, the rack controller monitoring and controlling operation of the compressor rack and determining compressor rack power consumption data; anda condensing unit controller in communication with the system controller, the condensing unit controller monitoring and controlling operation of the condensing unit and determining condensing unit power consumption data;wherein the system controller receives power consumption data from components of the refrigeration or HVAC system including at least the compressor rack power consumption data and the condensing unit power consumption data, determines a total power consumption of the refrigeration or HVAC ...

REFRIGERATION SYSTEM CONDENSER FAN CONTROL

A method of controlling a refrigeration system having a compressor, a condenser, an evaporator, and a variable speed condenser fan is provided. The method includes determining if a change in an ambient temperature or a compressor suction pressure is greater than a predetermined threshold, determining a near-optimal condensing pressure/temperature if the change in the ambient temperature or the compressor suction pressure is above the predetermined threshold, setting a condensing pressure setpoint based on the determined near-optimal condensing pressure/temperature, and setting a speed of the variable speed condenser fan based on the condensing pressure setpoint. 1. A method of controlling a refrigeration system having a compressor , a condenser , an evaporator , and a variable speed condenser fan , the method comprising:determining if a change in an ambient temperature or a compressor suction pressure is greater than a predetermined threshold;determining a near-optimal condensing pressure/temperature if the change in the ambient temperature or the compressor suction pressure is above the predetermined threshold;setting a condensing pressure setpoint based on the determined near-optimal condensing pressure/temperature; andsetting a speed of the variable speed condenser fan based on the condensing pressure setpoint.2. The method of claim 1 , wherein the step of determining the near-optimal condensing pressure/temperature comprises:determining the ambient temperature;determining a saturation temperature leaving the evaporator;determining a compressor speed; anddetermining the near-optimal condensing pressure/temperature based on the determined ambient temperature, saturation temperature leaving the evaporator, and compressor speed.3. The method of claim 2 , wherein the near-optimal condensing pressure/temperature is determined using the equation:{'br': None, 'sub': opt', 'amb', 'out,evap', 'comp, 'i': =f', 'T', ',Ts', 'CF, 'φ()×,'}{'sub': opt', 'amb', 's out, evap', ' ...

HEAT-PUMP AIR-CONDITIONING HOT-WATER SUPPLY DEVICE

A heat-pump air-conditioning hot-water supply device includes a first refrigerant passage connecting a compressor and a decompressor, a second refrigerant passage branching from between the compressor and a first solenoid valve and connecting a second solenoid valve, a hot-water supply heat exchanger, and the decompressor, a pressure sensor configured to measure discharge pressure of the compressor, and a control device configured to adjust an operational frequency of the compressor and adjust an opening degree of a valve of the decompressor. The control device is configured to calculate a condensing temperature from the discharge pressure, and perform operation in one of an air conditioning prioritized mode in which a preset operational frequency of the compressor is changed, and an energy saving prioritized mode in which the opening degree of the valve of the decompressor is changed, when the condensing temperature is not lower than a set condensing temperature. 1. A heat-pump air-conditioning hot-water supply device comprising:a first refrigerant passage connecting a compressor, a first solenoid valve, a flow switching device, an outdoor-side heat exchanger, at least one decompressor, and an indoor-side air-conditioning heat exchanger;a second refrigerant passage branching from between the compressor and the first solenoid valve and connecting a second solenoid valve, a hot-water supply heat exchanger, and the at least one decompressor;a pressure sensor configured to measure discharge pressure of the compressor; anda control device configured to adjust an operational frequency of the compressor and adjust an opening degree of a valve of the at least one decompressor,the at least one decompressor including a first decompressor connected with the outdoor-side heat exchanger, a second decompressor connected with the indoor-side air-conditioning heat exchanger, and a third decompressor connected with the hot-water supply heat exchanger,the control device being ...

REFRIGERATION SYSTEM WITH BRUSHLESS DC MOTOR COMPRESSOR DRIVE

A refrigeration system for a temperature-controlled storage device includes a refrigeration circuit, a cooling circuit, and a controller. The refrigeration circuit includes a compressor driven by a brushless DC motor operable at multiple different speeds, a first heat exchanger, an expansion device, and a cooling unit in fluid communication via a first working fluid. The cooling circuit includes a pump and a second heat exchanger in fluid communication with the first heat exchanger via a second working fluid such that the first heat exchanger is liquid-cooled by the second working fluid. The controller operates the brushless DC motor at multiple different speeds to accommodate multiple different thermal loads experienced by the refrigeration system. Each of the speeds corresponds to a different thermal load. The controller modulates the speed of the brushless DC motor to maintain a desired temperature of a temperature-controlled space within the temperature-controlled device. 1. A refrigeration system for a temperature-controlled storage device , comprising:a refrigeration circuit including a compressor driven by a brushless DC motor operable at multiple different speeds, a first heat exchanger, an expansion device, and a cooling unit in fluid communication via a first working fluid;a cooling circuit including a pump and a second heat exchanger in fluid communication with the first heat exchanger via a second working fluid such that the first heat exchanger is liquid-cooled by the second working fluid, the cooling circuit further including a valve operable to modulate a flow rate of the second working fluid through the first heat exchanger; anda controller configured to operate the brushless DC motor at multiple different speeds to accommodate multiple different thermal loads experienced by the refrigeration system, each of the speeds corresponding to a different thermal load, wherein the controller is configured to modulate a speed of the brushless DC motor to ...

Refrigerator

The present invention provides a refrigerator comprising: a cabinet having a storage chamber; a door for opening or closing the storage chamber; a case in which an inlet through which air flows from the storage chamber and an outlet through which the air is discharged to the storage chamber are formed; an evaporator provided inside the case for exchanging heat with the air to supply cool air; and a differential pressure sensor provided inside the case.

REFRIGERATION APPARATUS

Refrigeration apparatus R that includes a refrigerant circuit composed of compressor , gas cooler , electric expansion valve , and evaporator includes: electric expansion valve ; tank ; split heat exchanger ; electric expansion valve ; electric expansion valve ; auxiliary circuit ; main circuit ; low-pressure sensor ; and control apparatus , in which control apparatus regulates the pressure of the refrigerant after the refrigerant flows out of tank but before flows into electric expansion valve to be a first constant pressure when the pressure detected by low-pressure sensor is smaller than a specified pressure, and regulates the pressure of the refrigerant to be a second constant pressure smaller than the first constant pressure when the pressure detected by low-pressure sensor is larger than the specified pressure. 1. A refrigeration apparatus that includes a refrigerant circuit composed of a compression section , a gas cooler , a main throttle section , and an evaporator , the refrigeration apparatus comprising:a pressure-regulation throttle section connected to the refrigerant circuit that is on a downstream side of the gas cooler and is on an upstream side of the main throttle section;a tank connected to the refrigerant circuit that is on a downstream side of the pressure-regulation throttle section and is on the upstream side of the main throttle section;a split heat exchanger provided in the refrigerant circuit that is on a downstream side of the tank and is on the upstream side of the main throttle section;a first auxiliary throttle section and a second auxiliary throttle section, the first auxiliary throttle section regulating pressure of refrigerant flowing out of a pipe provided in a first height of the tank, the second auxiliary throttle section regulating the pressure of the refrigerant flowing out of a pipe provided in a position lower than the first height;an auxiliary circuit that allows the refrigerant to flow through a first flow channel of the ...

REFRIGERATION CYCLE DEVICE

A refrigeration cycle apparatus includes a refrigeration cycle in which a compressor, a heat source-side heat exchanger, an expansion device, and a load-side heat exchanger are connected by refrigerant pipes to circulate refrigerant. The refrigerant is a single-component refrigerant composed of 1,1,2-trifluoroethylene or a refrigerant mixture containing 1,1,2-trifluoroethylene. The compressor has a compression chamber and a motor in a compressor shell. A resin material is used as an insulating material for the motor. 1. A refrigeration cycle apparatus comprising a refrigeration cycle in which a compressor , a first heat exchanger , an expansion device , and a second heat exchanger are connected by refrigerant pipes to circulate refrigerant and a refrigerating machine oil ,the refrigerant being a single-component refrigerant comprising 1,1,2-trifluoroethylene or a refrigerant mixture containing 1,1,2-trifluoroethylene and another substance,the compressor having, in a sealed container thereof, a compression chamber and a motor, and being a low pressure shell-type compressor configured to cause the refrigerant to flow into the sealed container, compress the refrigerant in the sealed container by using the compression chamber, and discharge the compressed refrigerant out of the sealed container, andthe refrigeration cycle apparatus being operable at an operational state in which the refrigerant in a two-phase state having a quality of more than 0 and less than 1 is allowed to flow into the sealed container of the compressor,the refrigerating machine oil having a solubility of 50 wt % or more with respect to the refrigerant when a temperature of the refrigerant is 0 degrees C. and a pressure of the refrigerant is a saturation pressure at a refrigerant temperature of 0 degrees C.,the motor being insulated with a resin material serving as an insulating material.2. A refrigeration cycle apparatus comprising a refrigeration cycle in which a compressor , a first heat ...

REFRIGERATION APPARATUS

Refrigeration apparatus R that includes a refrigerant circuit composed of compression section , gas cooler , electric expansion valve , and evaporator includes: electric expansion valve ; tank ; split heat exchanger ; electric expansion valve ; electric expansion valves and ; auxiliary circuit , main circuit , and control apparatus , in which control apparatus regulates the gas cooler outlet temperature based on outside air temperature when the outside air temperature is higher than a specified temperature, and regulates the gas cooler outlet temperature based on saturation temperature ST of saturated liquid of the refrigerant after the refrigerant flows out of compressor but before flows into electric expansion valve , when the outside air temperature is lower than the specified temperature. 1. A refrigeration apparatus that includes a refrigerant circuit composed of a compression section , a gas cooler , a main throttle section , and an evaporator , the refrigeration apparatus comprising:a pressure-regulation throttle section connected to the refrigerant circuit that is on a downstream side of the gas cooler and is on an upstream side of the main throttle section;a tank connected to the refrigerant circuit that is on a downstream of the pressure-regulation throttle section and is on the upstream side of the main throttle section;a split heat exchanger provided in the refrigerant circuit that is on a downstream side of the tank and is on the upstream side of the main throttle section;a first auxiliary throttle section and a second auxiliary throttle section, the first auxiliary throttle section regulating a pressure of the refrigerant flowing out of a pipe provided in a first height of the tank, the second auxiliary throttle section regulating the pressure of the refrigerant flowing out of a pipe provided in a position lower than the first height;an auxiliary circuit that allows the refrigerant to flow through a first flow channel of the split heat exchanger and ...

A VARIABLE SPEED COMPRESSOR BASED AC SYSTEM AND CONTROL METHOD

The present disclosure relates to the field of air conditioning technology. In particular, it involves a control method and control system based on a variable speed AC compressor. 1. A variable speed AC (meaning cooling or heating) control system comprises:speed control calculation unit, database unit, operation data acquisition unit, wherein the speed control calculation unit readjusts the compressor speed of ΔF based on selecting any of three parameters from the compressor load current change of ΔI, refrigerant high pressure change of ΔPc, refrigerant low pressure change of ΔPe, in conjunction with change of time Δt since at different variable speed the compressor is run.2. The variable speed AC control system according to claim 1 , whereinthe database unit is for storing data from actual compressor cycle, the compressor on timing t′, the average outdoor temperature and the average compressor speed; andthe data storage unit stores the compressor speed regression model; andthe data storage unit provides to the speed control calculation unit those data.3. The variable speed AC control system according to claim 2 , whereinthe speed control calculation unit calculates the individual coefficient values as weight factors that would favor increase or decrease compressor speed by default setting amount.4. The variable speed AC control system according to claim 3 , whereinthe speed control calculation unit further evaluates the regression model by adding up the terms that would favor increase speed as well as decrease speed, and based on the net value, chooses to increase or decrease the compressor speed by the default setting amount.6. The variable speed AC control system according to claim 5 , whereinafter operation cycle is finished, the system tests whether the operation cycle is completed ahead of target timing as having adequate output or inadequate output conversely, and based on comparing similar multiple operation cycle performances, determines whether the similar ...

Control device, compressor, electric compressor, belt-driven compressor, vehicle air conditioner, and control method

Provided is a control device that performs protection control of a compressor without malfunction. The control device activates protection control on a compressor included in a refrigerant circuit based on a pressure value detected by a pressure sensor that is installed at a low-pressure side of the refrigerant circuit and a change over time of the pressure value.

OPTIMIZING ENERGY EFFICIENCY RATIO FEEDBACK CONTROL FOR DIRECT EXPANSION AIR-CONDITIONERS AND HEAT PUMPS

A system for maximizing the measured efficiency of an HVAC&R system may include the steps of (1) providing a plurality of operating parameters selected from the group consisting of condenser fan speed, evaporator fan speed, inlet solenoid valve position, outlet solenoid valve position, and compressor control to the air conditioner or the heat pump system wherein each of the plurality of operating parameters has a respective operating parameter value; (2) calculating an initial efficiency of the system using signals received from a plurality of components selected from the group consisting of a temperature sensor, a humidity sensor, a pressure sensor, a flow sensor, a voltage sensor, and a current sensor; and (3) proceeding, starting with a first of the plurality of operating parameters, to iteratively adjust values of each of the plurality of operating parameters and accept the new values only if the measured efficiency increases. 1. A method of maximizing the measured efficiency of an air conditioner or a heat pump system having a condenser , an evaporator , a compressor , and an expansion device , comprising the steps of:providing a plurality of operating parameters selected from the group consisting of a fan speed, a valve position, and a compressor control to the air conditioner or the heat pump system wherein each of the plurality of operating parameters has a respective operating parameter value;calculating an initial efficiency of the system using signals received from a plurality of components selected from the group consisting of a temperature sensor, a humidity sensor, a pressure sensor, a flow sensor, a voltage sensor, and a current sensor; andproceeding, starting with a first of the plurality of operating parameters as an active operating parameter having an initial active operating parameter value, to (1) adjust the initial active operating parameter value to a new operating parameter value, (2) calculate a measured efficiency of the system, (3) compare ...

HEAT PUMP

An exemplary heat pump includes: a compressor configured to compress a refrigerant; a first heat exchanger configured to condense the compressed refrigerant; a flow rate adjustment valve configured to adjust a flow rate of the condensed refrigerant; an expansion valve having an adjustable opening and configured to decompress the refrigerant having passed the flow rate adjustment valve; a second heat exchanger configured to cool a temperature control target by using the refrigerant decompressed by the expansion valve; and a control device configured to control the opening of the expansion valve based on a difference between the temperature of the refrigerant flowing into the second heat exchanger and the temperature of the refrigerant flowing out from the second heat exchanger, and to control the opening of the flow rate adjustment valve based on the flow rate of the refrigerant to be supplied to the second heat exchanger. 1one or more compressors, each configured to compress and eject refrigerant;a first heat exchanger configured to receive and condense refrigerant from the one or more compressors;a flow rate adjustment valve configured to adjust a flow rate of refrigerant condensed by the first heat exchanger; is downstream of the flow rate adjustment valve;', 'has an opening that is adjustable; and', 'is configured to decompress refrigerant that passes through the opening;, 'an expansion valve thata second heat exchanger configured to receive and cool a temperature control target using refrigerant decompressed by the expansion valve;a pressure sensor configured to detect a pressure of refrigerant in an inlet channel of the one or more compressors; and adjust the opening of the expansion valve such that a temperature of refrigerant that flows from the second heat exchanger is at least a predetermined temperature higher than a saturated steam temperature for the refrigerant at a pressure detected by the pressure sensor, and', 'control opening of the flow rate ...

AIR-CONDITIONING APPARATUS

An air-conditioning apparatus includes two heat source units, each including a compressor, an outdoor heat exchanger functioning as an evaporator, an accumulator connected to a suction side of the compressor, and at least one of an outdoor air-sending device configured to supply air corresponding to a heat exchange target for refrigerant to the outdoor heat exchanger or a flow control device (bypass and expansion device for bypass) configured to regulate a flow rate of the refrigerant flowing through the outdoor heat exchanger. A controller is configured to control at least one of the outdoor air-sending device or the flow control device so that a suction quality of the compressor of an upper heat source unit installed on an upper side and a suction quality of the compressor of a lower heat source unit installed on a lower side become the same. 1. An air-conditioning apparatus , comprising: an indoor heat exchanger, and', 'an indoor-side expansion device;, 'at least one indoor unit including'} a compressor,', 'an outdoor heat exchanger configured to function at least as an evaporator,', 'an accumulator connected to a suction side of the compressor, and', 'at least one of a heat exchange target supply unit configured to supply a heat exchange target for refrigerant to the outdoor heat exchanger and a flow control device configured to regulate a flow rate of the refrigerant flowing through the outdoor heat exchanger; and, 'a plurality of heat source units connected in parallel to the at least one indoor unit, each of the plurality of heat source units including'}a controller configured to control at least one of the heat exchange target supply unit and the flow control device,wherein two of the plurality of heat source units include one unit corresponding to an upper heat source unit installed on an upper side and an other unit corresponding to a lower heat source unit installed below the upper heat source unit, andwherein the controller is configured to, under a ...

Refrigerant Leak Sensor Power Control Systems And Methods

A sensor control system includes: a refrigerant leak sensor configured to, when powered, measure an amount of a refrigerant present in air outside of a heat exchanger of a refrigeration system, where the heat exchanger is located within a building that is at least one of heated and cooled by the refrigeration system; and a power control module configured to one of: continuously power the refrigerant leak sensor; and disconnect the refrigerant leak sensor from power when a blower that moves air past the heat exchanger is on.

Air-conditioning apparatus

A channel on an upstream side of a third expansion device and a channel on an upstream side of a second expansion device are connected during a heating operation, and medium pressure refrigerant generated by the third expansion device during the heating operation is introduced on a suction side of a compressor via the second expansion device and a suction injection pipe.

Air conditioner and method for controlling the same

An air conditioner and a method for controlling the same are disclosed. The air conditioner is able to operate in an efficient cooling cycle while simultaneously guaranteeing superior cooling performance in a low-temperature operation region. In the air conditioner, an airflow directing apparatus, which is installed in an outdoor unit, suppresses not only natural convection of the air, but also heat exchange between the condenser and outdoor air by the blowing fan, such that the air conditioner forms a normal cooling cycle by guaranteeing condenser pressure. The air conditioner guarantees cooling performance of a low-temperature operation region by adjusting the amount of outdoor air flowing through blade control of the airflow directing apparatus, and operates in an efficient cooling cycle, resulting in acquisition of compressor reliability.

Refrigeration cycle apparatus

A refrigeration cycle is filled with a single component refrigerant of a substance having a property of undergoing disproportionation reaction or a mixed refrigerant containing a substance having a property of undergoing disproportionation reaction and a refrigerating machine oil miscible with the refrigerant.