ДВУХКОМПРЕССОРНАЯ ХОЛОДИЛЬНАЯ УСТАНОВКА

Zentrifuge mit Kompressorkühleinrichtung und Verfahren zur Steuerung einer Kompressorkühleinrichtung einer Zentrifuge

Die vorliegende Erfindung betrifft eine Zentrifuge mit Kompressorkühleinrichtung (30) und Verfahren zur Steuerung einer Kompressorkühleinrichtung (30) einer Zentrifuge. Die erfindungsgemäße Zentrifuge weist im Kältekreislauf (41) der Kompressorkühleinrichtung (30) eine steuerbare Drosselvorrichtung (39) auf.

Verfahren zur Druck- und Temperaturreglung eines Fluids in einer Serie von kryogenen Verdichtern

Verfahren zur Druck- und Temperaturregelung eines Fluids, insbesondere Helium in einer Serie von kryogenen Verdichtern, umfassend die Schritte: Erfassen einer Ist-Drehzahl für jeden Verdichter (V1, V2, V3, V4), Erfassen eines Ist-Eintrittsdrucks (pist), sowie einer Ist-Eintrittstemperatur (Tist) am Eingang des am weitesten stromauf angeordneten, ersten Verdichters (V1) der Serie, Bereitstellen einer Maximaldrehzahl (ni,max) für jeden Verdichter (V1, V2, V3, V4) der Serie, sowie eines Soll-Eintrittsdrucks (psoll) für den ersten Verdichter (V1) der Serie, Bestimmung eines Drehzahlindex (Di) für jeden Verdichter (V1, V2, V3, V4) aus der Maximaldrehzahl (ni,max) und der Ist-Drehzahl (ni) jedes Verdichters (V1, V2, V3, V4), Bestimmung eines Proportionalwertes (prop) aus der Abweichung des Ist- vom Soll-Eintrittsdruck (pist, psoll), Bestimmung eines Prioritätswertes (PW) aus dem kleineren von beiden Werten: Proportionalwert (prop) und dem kleinsten Drehzahlindex (Di) aller Verdichter (V1, V2, ...

APPARATUS TO PROVIDE TEMPERATURE CONTROL AND CIRCULATION OF LIQUID

A constant temperature liquid circulating apparatus has a constant temperature liquid circuit section 93 in which a liquid is supplied and returned from a load 2, a refrigerating circuit section 92 and a control section 94. The refrigerating circuit section provides cooling or heating and has a main circuit which comprises a compressor 7 having its rotational speed controlled by an inverter power source, a condenser 8, an evaporator 10 and a first electronic expansion valve 56 in series connection, and a hot gas circuit 58 which bypasses the condenser and first electronic expansion valve. The bypass line 58 has a second electronic expansion valve 59 and supplies a portion of the high temperature refrigerant discharged from the compressor to the evaporator. The constant temperature liquid circuit has a tank 24, a heat exchanger 25 to heat or cool the liquid returned from the load 2, at least one temperature sensor 37 to detect the liquid temperature, and circulating means to supply the temperature ...

Refrigerating device

CONTROL SYSTEM FOR REFRIGERATED DRYINGS OF COMPRESSED GASES

REFRIGERANT PLANT

Cooling storage

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.

Air conditioner start control device

CASCADE FLOATING INTERMEDIATE TEMPERATURE HEAT PUMP SYSTEM

A cascade heat pump system is configured with variable- speed compressors which allow operation at a high system coefficient of performance for a given thermal load. An electronic control module may be utilized to dynamically vary the speed of the compressors to achieve maximum energy efficiency. Variable- speed fans or blowers may also be used.

Includes a heat pump machine and a series of relevant process

HYBRID COMPRESSING DEVICE

Installation for production of cooling effect in e.g. cold room, has control unit equipped with reception unit for reception of signals from sensor, where control unit controls compressor as function of signals received from sensor

L'invention concerne une installation frigorifique pour la production de froid dans une zone (10) à refroidir du type comprenant au moins : - une unité frigorifique comportant au moins un compresseur (1) à vitesse variable et un évaporateur (2) à travers lesquels un fluide frigorigène circule, - des moyens (5) de mesure de la température aptes à être positionnés dans la zone (10) à refroidir, - des moyens (6) de pilotage du compresseur (1) en fonction des données fournies par les moyens (5) de mesure de la température. Cette installation est caractérisée en ce que l'installation comporte en outre au moins une unité (7) photovoltaïque raccordable à l'unité frigorifique pour l'alimentation en énergie électrique du compresseur (1) de ladite unité et un capteur (8) de rayonnement lumineux, les moyens (6) de pilotage du compresseur (1) étant équipés de moyens de réception des signaux du capteur (8) de rayonnement lumineux pour piloter également le compresseur (1) en fonction desdits signaux.

REFRIGERATION CYCLE DEVICE

A refrigerant circuit is formed by connecting by means of refrigerant piping a compressor (2), a condenser (3), a first supercooling device (6) that supercools a refrigerant by exchanging heat with the air, a second supercooling device (8) that performs a heat exchange between refrigerant streams that have been branched by a branch pipe (14), thereby supercooling one of the refrigerant streams, a flow rate adjustment device (12) that adjusts the flow rate of the other of the branched refrigerant streams, and then passes this refrigerant through the second supercooling device, a bypass passage (11) through which the refrigerant that has passed through the flow rate adjustment device (12) and the second supercooling device (8) flows, an expansion valve (9), and an evaporator (10). In addition, a control device (20) is provided that controls, on the basis of the air temperature, the amount of heat exchanged in the first supercooling device (6) and the amount of heat exchanged in the second ...

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.

AIR CONDITIONER

A multiple type air conditioner which can be used irrespective of variations in input voltage and which is intended to make parts usable in common. It is also intended to increase air conditioning efficiency to achieve energy saving. To solve these problems, a multiple type air conditioner provided with a plurality of indoor units connected to an outdoor unit comprises a DC power source (31) having an active filter, a first motor (21a) (compressor 21) which is a DC motor, a second motor (15), a third motor (16) (outdoor fan), and an outdoor fan of hollow thick-walled vane shape.

Cooling of data centers

In a cooling system for cooling racks in a data center, cooling fluid is circulated in the data center by a cooling device having a fan. In addition, this system includes a plenum having a plurality of returns and an outlet. The outlet of the plenum is in fluid communication with the fan and the plurality of returns are configured for removing the cooling fluid from the data center. Furthermore, the returns and are operable to vary a characteristic of the removal of the cooling fluid.

Refrigerating storage cabinet

A storing section 49 stores data of a pull down cooling characteristic indicative of a time-varying mode of reduction in a target temperature drop. For example, when this is a linear function line xp, a target internal temperature drop degree takes a constant value Ap, irrespective of an operating time. An actual temperature drop degree Sp is computed on the basis of the detected internal temperature. The computed value Sp is compared with a target value Ap read from the storing section 49. When the computed value Sp is less than the target value Ap, a rotational speed of an inverter compressor 32 is increased via an inverter circuit 55. When the computed value Sp is larger than the target value Ap, the rotational speed of the compressor 32 is decreased. The speed increases and decreases are repeated so that pull down cooling is performed along the linear line xp.

Refrigerating device

A refrigerating device includes a compressor, a temperature detector and a protection control section. The compressor compresses a refrigerant. The temperature detector detects a temperature of the refrigerant discharged from the compressor on an outside of the compressor. The protection control section judges that a transition following a starting of the compressor is in effect and that a steady state following an end of the transition in which a state of the refrigerant is stable is in effect, performs protection control on the compressor when a detected temperature detected by the temperature detector exceeds a first determination temperature during the transition, and performs the protection control on the compressor when the detected temperature exceeds a second determination temperature during the steady state.

METHOD FOR OPERATING STATUS DETERMINATION OF A REFRIGERANT COMPRESSOR/EXPANDER

In order to improve a method for operating status determination of a refrigerant compressor/expander comprising a compressor unit and a drive unit such that information on the operating status of a refrigerant compressor/expander which is as reliable as possible can be obtained, it is proposed that, for at least one bearing of the refrigerant compressor/expander, a load value resulting from an operation of said refrigerant compressor/expander and a speed value are determined and in that, on the basis of the speed value and the load value and also at least one operating parameter, there is determined for the at least one bearing an operating prediction value for a future maintenance-free operation of the refrigerant compressor/expander.

Method and device for controlling capacity change of compressor, and smart home appliance

A method and a device for controlling a capacity change of a compressor, and a smart home appliance. The method includes: determining whether a capacity of the compressor is required to be changed; if yes, determining an intermediate frequency; changing the capacity of the compressor while maintaining the operating frequency of the compressor at the intermediate frequency; and the maintaining the operating frequency of the compressor at the intermediate frequency reduces a sudden change in output of the compressor after the changing the capacity.

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.

KÜHLVORRICHTUNG UND STEUERVERFAHREN

Oil balancing apparatus for compressor, has first oil balancing circuit whose bottom is attached with oil tank of first compressor over second oil balancing circuit

The apparatus has first oil balancing circuit (EQ1) and a second oil balancing circuit (EQ2). The first oil balancing circuit is interconnected over oil tanks of the individual second compressor (CP1). The oil tank of first compressor (MCP) is attached over second oil balancing circuit at the bottom of first oil balancing circuit. An independent claim is included for refrigeration apparatus.

Drucksteuerung einer Dampfleitung

Controls and operation of variable frequency drives

Estimating outdoor temperature in air conditioner

Air conditioner apparatus includes a refrigerating circuit having a variable capacity compressor 1, an indoor heat exchanger 5, an expansion device 4, and an outdoor heat exchanger 3. A variable speed outdoor fan 6 circulates outside air through the outdoor heat exchanger. The temperature of the outdoor heat exchanger is detected by detector 11. The outside air temperature is estimated from the detected outdoor heat exchanger temperature, the capacity of the variable capacity compressor and the speed of the variable speed outdoor fan, and is used to control the compressor and/or the fan. The apparatus can be used for heating or cooling. ...

MICROCOMPUTER CONTROL FOR CENTRAL HEATING WITH NIGHT SET-BACK

A Hybrid Heat Pump

CONTROL PROCEDURE FOR REFRIGERATOR

Ejector cycle system with critical refrigerant pressure

A refrigeration system and a separator therefor

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.

ENERGY-SAVING CLIMATIC TEST CHAMBER AND METHOD OF OPERATION

Climatic test chamber (10) for carrying out a sequence of specified test cycles and cooled by means of at least a refrigerating circuit (100, 200, 410) including a variable-speed compressor (120, 210, 410). During the steps of the test cycles in which said chamber (10) is held at a minimum set temperature, the compressor (120, 210, 410) operates at the minimum rotating speed thereof and the refrigeration capacity is used to cool a cold storage medium. The cold stored by the cold storage medium is then recovered to subcool the refrigerant medium during the cooling-down steps in which the compressor (120, 210, 410) operates at the maximum rotating speed thereof.

SYSTEMS AND METHODS FOR CONTROLLING A VARIABLE SPEED WATER PUMP

A HYBRID HEAT PUMP

The present invention relates to an electrically driven, vapour compression heat pump device (10). The heat pump device comprises a variable speed or variable capacity refrigerant compressor (101), a compression stage having a first condenser, an expansion stage having a first evaporator, a DC to AC variable speed compressor drive inverter unit (204), a grid AC to DC power supply unit (203) and an electronic control unit (202). The control unit varies the thermal capacity, and the power consumed by the device, in response to an input from at least one of: a renewable electricity generation input, a premises net consumption monitor, a utility grid frequency monitor, and a third party control input.

AVOIDING COIL FREEZE IN HVAC SYSTEMS

An HVAC system includes an evaporator. The evaporator includes a sensor configured to measure a property value (i.e., a saturated suction temperature or a saturated suction pressure) associated with saturated refrigerant flowing through the evaporator. The system includes a variable-speed compressor configured to receive the refrigerant and compress the received refrigerant. The system includes a controller communicatively coupled to the sensor and the variable-speed compressor. The controller monitors the property value measured by the sensor and detects a system fault, based on the monitored property value. In response to detecting the system fault, the controller operates the compressor in a freeze-prevention mode, which is configured to maintain the property value above a setpoint value by adjusting a speed of the variable-speed compressor. This prevents or delays freezing of the evaporator during operation of the system during the detected system fault.

REFRIGERATION SYSTEM USING EMERGENCY ELECTRIC POWER

In certain embodiments, a refrigeration system comprises an emergency electric power supply configured to supply power to at least one motor drive of the system. The system further comprises a power switch coupled to the emergency electric power supply, a tank configured to store a refrigerant, a first compressor configured to compress the refrigerant of the tank, and a controller coupled to the power switch and the first compressor. The controller may receive an indication from the power switch that the system is using the emergency electric power supply, and in response to receiving the indication from the power switch that the system is using the emergency electric power supply, operate the system in a first power outage mode. The controller may determine an amount of power to supply to the first compressor based on the first power outage mode and transmit a signal to instruct the first compressor to turn on.

Air conditioning device

Heat pump

Separator or refrigerating system

METHOD OF MANAGING A REVERSIBLE AIR CONDITIONING CIRCUIT INDIRECT MOTOR VEHICLE

NOISE REDUCTION METHOD FOR REFRIGERATOR

REFRIGERATION CYCLE DEVICE

A refrigeration cycle device equipped with: an outdoor unit equipped with a compressor and a heat-source-side heat exchanger; an indoor unit equipped with a usage-side heat exchanger; and a liquid-side connecting pipe and a gas-side connecting pipe connecting the outdoor unit and the indoor unit. R32 is used as the refrigerant in the refrigeration cycle device, and the refrigeration cycle device is configured so as to be equipped with a control device for controlling the refrigeration cycle device, with the upper limit value of a control pressure controlled by this control device being set, or capable of being set, so as to equal the upper limit value of the control pressure of a refrigeration cycle device using an R22 refrigerant or an R407C refrigerant. Thus, it is possible to obtain a refrigeration cycle device capable of reusing existing refrigerant connecting pipes and branch pipes while using R32 as the refrigerant.

Method and system for controlled cooling of small milk quantities

A method and system for controlling the cooling of small milk quantities in a cooling tank (2) having a bottom wall portion (12) with a milk cooling surface (12') within the tank being part of a cooling circuit an agitator (19) within the tank for stirring the milk therein. The gist of the invention is a) providing an element for measuring the milk quantity in the tank, and a temperature transducer (11) for monitoring the milk temperature in the tank, b) providing, in the cooling circuit, an evaporator (4) connected to the bottom wall portion of the tank, a compressor (5), and a condenser (7), c) controlling the temperature of the refrigerant in the evaporator by regulating the vaporizing pressure, so that the temperature of the milk cooling surface (12') is always higher than 0° C. when the compressor (5) is running, d) monitoring the milk quantity in the tank, and, when sufficient/insufficient for the agitator to work properly.

Interactive control system for an HVAC system

An interactive system for controlling the operation of an HVAC system is provide that comprises a thermostat for initiating the operation of the HVAC system in either a full capacity mode of operation or at least one reduced capacity mode of operation, and a controller for an outside condenser unit having a condenser fan motor and a compressor motor, the controller being capable of operating the compressor in a full capacity mode and at least one reduced capacity mode. The system also comprises a controller for an indoor blower unit having a blower fan motor, the controller being capable of operating the blower fan motor in a full capacity mode an at least one reduced capacity mode. The system further includes a communication means for transmitting information between the outside condenser unit controller and at least the indoor blower controller, where the information relates to the operation of the indoor blower and the outdoor condenser unit. The indoor blower controller responsively ...

Kühleinrichtung für Fahrzeuge und Verfahren zur Steuerung und/oder Regelung einer Kühleinrichtung

Die Erfindung bezieht sich auf eine Kühleinrichtung sowie auf ein Verfahren zur Steuerung und/oder Regelung einer Kühleinrichtung für Fahrzeuge, wobei die Kühleinrichtung einen Kältemittelverdichter, einen in Strömungsrichtung des Kältemittels nach dem Kältemittelverdichter angeordneten Kondensator, einen nach dem Kondensator angeordneten ersten Verdampfer zur Kühlung von einem Fahrgastraum zuzuführender Luft und einen parallel zu dem ersten Verdampfer angeordneten zweiten Verdampfer zum Kühlen eines elektrischen Speichers, umfasst, und wobei mittels einer Steuereinheit der Kältemittelverdichter in Abhängigkeit von einer Kühlbedarf-Anforderung für den Fahrgastraum und/oder einer Kühlbedarf-Anforderung für den elektrischen Speicher auf Basis der höheren Kühlbedarf-Anforderung angesteuert oder geregelt wird.

Air conditioner

The air-conditioning device (1) is configured so as to circulate a nonazeotropic refrigerant mixture through a compressor (110), a first heat exchanger (120), a second heat exchanger (130), a first expansion valve (140), and a third heat exchanger (150) in this order. A notification unit (13) is configured so as to provide a warning notification to a user if a first refrigerant ratio determined from a first difference between a first temperature (T1) and a second temperature (T2) and a second difference between a third temperature (T3) and a fourth temperature (T4) is different from an appropriate value. The first temperature (T1) is the temperature of the nonazeotropic refrigerant mixture between the first heat exchanger (120) and the second heat exchanger (130). The second temperature (T2) is the temperature of the nonazeotropic refrigerant mixture between the second heat exchanger (130) and the first expansion valve (140). The third temperature (T3) is the temperature of the nonazeotropic ...

Air conditioning apparatus and method of controlling same

Controls and operation of variable frequency drives

A method or system for starting a compressor in a refrigerant loop, comprising: operating the compressor in a first mode which includes preventing current level for a motor of the compressor from exceeding a predetermined current limit for a period of time not to exceed a predetermined period of time; and determining if the motor exceeds a predetermined speed threshold at or before expiration of the predetermined period of time. Also disclosed is a system or method for operating a motor driven refrigerant compressor comprising: running the motor in start mode where the speed is limited for a predetermined period; and stopping the compressor if the motor current exceeds a predetermined limit during the start mode.

COOLING DEVICE AND TAX PROCEDURE

COOLING DEVICE

ENERGY SAVING CLIMATIC TEST CHAMBER AND OPERATING PROCEDURE

Systems and methods for controlling a variable speed water pump

Systems and methods for providing an improved strategy for controlling a variable speed water pump in a vehicle. In some embodiments, more than one water pump speed function is calculated based on values obtained from vehicle sensors, and a 5 controller chooses among the water pump speed function results to set a water pump speed. In some embodiments, the water pump speed is increased when driveline torque is greater than a threshold amount for an amount of time that varies based on the driveline torque. In some embodiments, ambient temperature is considered while determining whether the water pump should provide full coolant flow to an auxiliary coolant loop of a 10 trailer.

CONDENSING DEHUMIDIFIER FOR AN ARENA OR THE LIKE

A dehumidifier for operation within the 5°C to 20°C temperature range and 50 to 100 percent relative humidity range of air includes an evaporator, a condenser, a fan that draws humid air through the evaporator and condenser, and a compressor for pumping refrigerant fluid through both the evaporator and condenser. The evaporation temperature is maintained in the evaporator at least at -4°C, resulting in a temperature within the evaporator and at the outlet thereof being greater than 0°C, thereby preventing the formation of ice in the evaporator and allowing the operation of the evaporator to its full power all the time.

A REFRIGERATION SYSTEM AND A SEPARATOR THEREFOR

A refrigeration system comprises a compressor (1), a condensor (2), a receiver (3) and an evaporator (4), each having an inlet and an outlet, and a separator (5) having an inlet and a first and a second outlet, connected to each other conventionally. The separator (5) is positioned laterally of the evaporator (4) and closer thereto than to the compressor (1). A controller (26) ensures overfeed of the evaporator (4) by regulating the feed rate of liquid refrigerant from the receiver (3) such that the separator (5) is feeding the evaporator (4) with liquid refrigerant in proportion to demand and safeguarding the desired overfeed. The separator (5) comprises a cylindrical container (19) having two outlets (7, 8) and an inlet (6) for separating the vapor and liquid components of a refrigerant. The inlet (6) is directed tangentially into the cylindrical container (19). A foraminous partition (23) is positioned inside the container (19) and extends downwardly of the inlet (6) and inwardly of ...

Air conditioner device

ORDER BY MICROCOMPUTER OF the ADDITIONAL HEATING Of a HEAT PUMP

Method for vehicle air conditioning, comprises control of compressor motor starting speeds by comparing motor current with first and second current thresholds derived from test data

L'invention concerne un système et procédé de climatisation pour véhicule. Le système de climatisation (100) pour véhicule comprend un compresseur (1), un moteur électrique pour entraîner le compresseur (1), un dispositif pour régler de manière variable la vitesse de rotation de l'arbre d'entraînement du compresseur (1) sur la base d'une vitesse de rotation désirée; un dispositif pour limiter la vitesse de rotation de l'arbre d'entraînement du compresseur (1) à une valeur inférieure à la vitesse de rotation désirée du compresseur (1) lorsqu'une première valeur d'un courant détecté au moteur électrique est supérieure ou égale à une première valeur prédéterminée; et un dispositif pour arrêter la limitation de la vitesse de rotation de l'arbre d'entraînement du compresseur (1) lorsqu'une deuxième valeur du courant détecté est inférieure à une deuxième valeur prédéterminée pendant l'opération de limitation.

METHOD OF OPERATING A REFRIGERATION SYSTEM FOR A MOBILE CARGO CONTAINER

A method (80) of operating a refrigeration system (48) for a refrigerated mobile cargo container (2) includes sensing a temperature outside of the refrigerated mobile cargo container (2), detecting a position of a door (16, 18) on the refrigerated mobile cargo container (2), and activating the refrigeration system (48) if the door (16, 18) is open and the temperature outside of the refrigerated mobile cargo container (2) is less than a predetermined value.

Air conditioner with defrost control

Stress to be imposed on a compressor in reverse cycle operation is reduced. A cycle controller causes an outdoor heat exchanger to function as a condenser and an indoor heat exchanger to function as an evaporator when a reverse cycle executing condition is met, so that a refrigerant circulates in reverse of a heating cycle. A rotation speed controller adjusts a rotation speed of a compressor in a reverse cycle, depending on an index correlated with an amount of frost on the outdoor heat exchanger at a start of the reverse cycle. The rotation speed controller decreases the rotation speed of the compressor in the reverse cycle as the index at the start of the reverse cycle indicates that the amount of the frost on the outdoor heat exchanger is smaller.

Interactive control system for an HVAC system

An interactive system for controlling the operation of an HVAC system is provide that comprises a thermostat for initiating the operation of the HVAC system in either a full capacity mode of operation or at least one reduced capacity mode of operation, and a controller for an outside condenser unit having a condenser fan motor and a compressor motor, the controller being capable of operating the compressor in a full capacity mode and at least one reduced capacity mode. The system also comprises a controller for an indoor blower unit having a blower fan motor, the controller being capable of operating the blower fan motor in a full capacity mode an at least one reduced capacity mode. The system further includes a communication means for transmitting information between the outside condenser unit controller and at least the indoor blower controller, where the information relates to the operation of the indoor blower and the outdoor condenser unit. The indoor blower controller responsively ...

Portable heating system and method for pest control

A method for killing pests in an affected area of a structure, comprises positioning a heat exchanger unit within an affected area, coupling a first end of an inlet hose to a faucet, and coupling a second end of the inlet hose to an inlet port of the heat exchanger unit such that the heat exchanger unit may receive a flow of water from the faucet. The heat exchanger unit generates heated air by transferring heat from the flow of water received from the faucet to air flowing through the heat exchanger unit. The method continues by positioning an electric heater proximate to the heat exchanger unit, the electric heater operable to further heat the heated air emitted by the heat exchanger unit to a target temperature greater than 120 degrees Fahrenheit, the further heated air being emitted into the affected area.

Screw refrigerating apparatus

A screw refrigerating apparatus comprising a refrigerant circulating passage including a screw compressor, a condenser, an expansion valve, and an evaporator is constituted such that a bypass flow passage branching at a part of the refrigerant circulating passage between the condenser and the expansion valve, routing through throttle means, and communicating with a rotor cavity within the screw compressor is provided. The screw refrigerating apparatus is capable of simplifying the structure, decreasing the size, decreasing labour of the maintenance, and the like.

Refrigerating machine optimized for carrying out cascade refrigerating cycles

Totally recuperative conditioning system operating two cascade refrigerating cycles with optimized circuit comprising at least an inner unit and an outer unit. The inner unit comprises at least a compressor, three heat exchangers, a throttling valve and a cycle inverting valve and the outer unit comprises at least a compressor, a heat exchanger, a throttling valve, a cycle inverting valve and the heat exchanger shared with said inner unit. The system is able to serve a plurality of users distributing, depending on the requirements, heat or cold for conditioning ambients and hot water for sanitary use, and it is characterized in that it is provided with a simplified water circuit comprising a number of valves not higher than five for the inner unit and five for the outer unit, of which at least an inverting valve for each said unit and in that said heat exchanger functions as evaporator or as condenser for cycles operating in said units depending on the opening state of said valves.

AIR CONDITIONING DEVICE SPECIALIZED FOR HEATING

The invention provides a heating dedicated air conditioner that, if performing test operation in a reverse cycle to that of the heating cycle, can prevent drain water from an indoor heat exchanger from overflowing a drain pan. The heating dedicated air conditioner comprises: a compressor (21); an indoor heat exchanger (42); an outdoor heat exchanger (23); an outdoor expansion valve (24), which is provided between one end of the indoor heat exchanger (42) and one end of the outdoor heat exchanger (23); a four-way switching valve (22) that switches between a first state, wherein a discharge side of the compressor (21) and an other end of the indoor heat exchanger (42) are connected and a suction side of the compressor (21) and an other end of the outdoor heat exchanger (23) are connected, and a second state, wherein the discharge side of the compressor (21) and the other end of the outdoor heat exchanger (23) are connected and the suction side of the compressor (21) and the other end of the ...

FAHRZEUGKLIMATISIERUNGSVORRICHTUNG

Es wird eine Fahrzeugklimatisierungsvorrichtung (1) bereitgestellt, die in der Lage ist, gleichzeitig mit der Kühlung einer Batterie (B) auf einem Außenwärmetauscher (22) gebildeten Frost zu entfernen. Die Fahrzeugklimatisierungsvorrichtung (1) führt den Betrieb in einem ersten Batteriekühlprioritätsmodus, einem zweiten Batteriekühlprioritätsmodus, oder einem Solo-Batteriekühlmodus durch, wenn festgestellt wird, dass die Batterie (B) gekühlt werden muss und wenn auch festgestellt wird, dass der auf dem Außenwärmetauscher (22) gebildete Frost entfernt werden muss. Auf diese Weise ist es möglich, die Batterie (B) zu kühlen und gleichzeitig durch den Batteriekühlbetrieb den auf dem Außenwärmetauscher (22) gebildeten Frost zu schmelzen, und daher ist es möglich, den Stromverbrauch verglichen mit dem Fall zu reduzieren, bei dem der Batteriekühlbetrieb und der Entfrostbetrieb einzeln durchgeführt werden.

Controls and operation of variable frequency drives

A system or method comprising an electric motor drivingly coupled to a compressor of an HVACR system, such as a screw or scroll compressor; a power supply drivingly coupled to said electric motor; and a controller configured to control the power supply to selectably supply current to the electric motor, evaluate a characteristic of the current drawn from the power supply by the motor relative to a threshold, and control the power supply to cease supplying current to the electric motor based upon an evaluation that the characteristic is greater than the threshold. The threshold being selected to distinguish a current condition attributable to the screw or scroll compressor being driven in a reverse direction and a current condition attributable to starting of the compressor in a forward direction. The interrupting operation of the motor may be interrupted if the characteristic of the current drawn from the power supply exceeds the threshold.

VERFHAREN AND DEVICE CONTROLLED ABFULLEN OF SMALLER MILKING QUANTITIES

COOLING UNIT AND CONTAINER WITH THIS UNIT

AIR CONDITIONING SYSTEM

A refrigerator and a method for controlling variable cooling capacity thereof

Air conditioner start control device

Provided is an air conditioner for causing the room temperature to approach a set temperature, wherein the performance of a compressor is automatically lowered as the room temperature approaches the set value. When the air conditioner performs an in-advance operation, it is possible to suppress the power consumption thereof. As the room temperature (Tr) approaches a set value (Ts), a start control device (33) of the air conditioner (1) automatically lowers the performance of the compressor. The start control device (33) calculates the period from starting the operations of the air conditioner (1) to the moment when the flexion point in the measured room temperature occurs (hereinafter, referred to as the " flexion point occurrence period"). Subsequently, the start control device (33) sets the point in time that precedes a desired time by the flexion point occurrence period as the time at which the air conditioner (1) is scheduled to start operation. When the current time comes to match ...

Air conditioner device

... [Problem] To provide an air conditioner device which carries out defrosting operation control in accordance with the capacities of the indoor expansion valves, thereby preventing damage to the compressor, and delayed return to heating operation. [Solution] An outdoor equipment controller (200) has a defrosting operation condition table (300a) which defines startup rotation speeds (Cr) in accordance with a flow coefficient sum (Cva) representing the sum of flow coefficients (Cv) which indicate the capacities of indoor expansion valves (52a-52c). The outdoor equipment controller (200) adds the flow coefficients (Cv) of the indoor expansion valves (52a-52c) which have been input by an installation information input unit (250) and calculates the flow coefficient sum (Cva), and referring to the defrosting operation condition table (300a), decides upon a startup rotation speed (Cr). When initiating a defrosting operation, the outdoor equipment controller (200) starts up the compressor (21) at ...

Air conditioning apparatus

An air conditioning apparatus 1 includes first start control and second start control as its start control. In the first start control, first outdoor heat exchangers 24a, 24b are controlled to function as evaporators and second outdoor heat exchangers 25a, 25b are controlled to function as condensers. Thus, even when the compressors 21 a, 21 b are driven on at a given rotation number, the discharge pressures thereof can be prevented from increasing, thereby being able to prevent the internal pressures of the compressors 21 a, 21 b from increasing. Also, after end of the first start control, the first outdoor heat exchangers 24a, 24b and second outdoor heat exchangers 25a, 25b are all controlled to function as evaporators, and the compressors 21a, 21b are driven on at a given rotation number. This can shorten the rising time of the heating capacity in the start of the normal heating operation.

Air conditioner

TEMPERATURE REGULATION SYSTEM WITH HYBRID REFRIGERANT SUPPLY AND REGULATION

The present invention provides a temperature regulation system with hybrid refrigerant supply and regulation in which a pressure-reducing regulator (R100) from an evaporator (EVA100) controlled by a switch valve (V100) being installed between a condenser (CON 100) and the evaporator (EVA100), and a refrigerant injector (IJ100) being installed between the condenser (CON100) and the evaporator (EVA100), and an electric control unit (ECU100) being provided for controlling the switch valve (V100) and the pressure-reducing regulator (R100) or for controlling the refrigerant injector (IJ100) such that both or at least one thereof being served to transport the refrigerant (REF100) to the interior or exterior of the evaporator (EVA100).

SYSTEMS AND METHODS FOR CONTROLLING A VARIABLE SPEED WATER PUMP

Systems and methods for providing an improved strategy for controlling a variable speed water pump in a vehicle. In some embodiments, more than one water pump speed function is calculated based on values obtained from vehicle sensors, and a controller chooses among the water pump speed function results to set a water pump speed. In some embodiments, the water pump speed is increased when driveline torque is greater than a threshold amount for an amount of time that varies based on the driveline torque. In some embodiments, ambient temperature is considered while determining whether the water pump should provide full coolant flow to an auxiliary coolant loop of a trailer.

Vehicle hvac and battery thermal management

An HVAC system for a vehicle having a battery pack, and a method of operation, is disclosed. The HVAC system may comprise a refrigerant loop having a first leg and a second leg, and a refrigerant compressor in the refrigerant loop. In the first leg, an evaporator provides cooling to a passenger cabin of the vehicle, an evaporator shut-off valve selectively blocks the flow of refrigerant through the evaporator, and an evaporator thermal expansion valve is upstream from the evaporator. In the second leg, a battery heat exchanger receives the refrigerant, a battery thermal expansion valve is located upstream from the battery heat exchanger, and a battery cooling shut-off valve selectively blocks the flow of refrigerant through the battery heat exchanger. The shut-off valves and compressor arecontrolled to control the cooling of the passenger cabin and the battery pack.

Air-conditioning apparatus with separate component casings

An air-conditioning apparatus including, a first housing (an outdoor unit) that accommodates a compressor and a heat source side heat exchanger; a second housing (a heat medium relay unit) that accommodates a heat exchanger related to heat medium, an expansion device, and a pump; a third housing (a heat medium regulating unit) that accommodates a first heat medium flow switching device, a second heat medium flow switching device, and a heat medium flow control device; and a fourth housing (indoor unit) that accommodates a use side heat exchanger have separately different casings.

Method for controlling multiple refrigeration units

A refrigeration system for cooling a logic module includes an evaporator housing including an evaporator block in thermal communication with the logic module. The evaporator housing includes a humidity sensor for detecting a humidity within the evaporator housing. The system further comprises a controller for controlling a refrigeration unit supplying cold refrigerant to the evaporator block in response to the operating conditions of the logic module and the temperature of the evaporator block. In another aspect of the invention, two modular refrigeration units are independently operable to cool the evaporator block, and each refrigeration unit is controllable in various modes of operation including an enabled mode in which it is ready to cool the evaporator and an on mode in which it is actively cooling the evaporator. In another aspect of the invention, the evaporator block and a heater on a reverse side of the circuit board are particularly controlled during concurrent repair operations ...

Air conditioning apparatus and method of controlling same

An air conditioning apparatus and method of controlling same wherein the air conditioner includes a refrigerating circuit having a variable capacity compressor, an indoor heat exchanger, an expansion device, and an outdoor heat exchanger; a variable speed outdoor fan for circulating an outside air through the outdoor heat exchanger; and an outdoor heat exchanger temperature detector for detecting the temperature of the outdoor heat exchanger. The outside air temperature is estimated from the detected outdoor heat exchanger temperature, the capacity of the variable capacity compressor and the speed of the variable speed outdoor fan, and is used to control the compressor and/or the fan.

COMPRESSOR DRIVING APPARATUS AND HOME APPLIANCE INCLUDING THE SAME

A compressor driving apparatus, or a home appliance including the same, includes a DC terminal capacitor to store a charge, an inverter to convert direct current associated with the charge of the DC terminal capacitor into an alternating current and output the alternating current to a motor, an output current detection unit to detect an output current flowing in the motor, and an inverter controller to increase a motor speed by starting the motor, and controlling a speed increase of the motor to change based on an increasing slope of a change in an output current detected by the output current detection unit during the speed increase of the motor.

A System and Method for Controlling a Compressor

A control system and method for controlling a compressor 20 that forms part of a climate control system 10; the control system/method comprises steps of assessing at least one temperature; generating a first compressor speed signal based on the assessed temperature; determining a pressure within the climate control system; generating a second compressor speed signal based on said pressure; accessing data held in a memory store corresponding to compressor speeds (maps/ look up tables); and generating an optimal compressor speed based on said first and second compressor speeds and said compressor speed data. Preferably, a vehicle's climate control system operation is achieved by optimal control of the operating speed of the compressor using temperature and pressure controllers 26, 36.

Startup control apparatus of air conditioner

Provided is an air conditioner for causing the room temperature to approach a set temperature, wherein the performance of a compressor is automatically lowered as the room temperature approaches the set value. When the air conditioner performs an in-advance operation, it is possible to suppress the power consumption thereof. As the room temperature (Tr) approaches a set value (Ts), a start control device (33) of the air conditioner (1) automatically lowers the performance of the compressor. The start control device (33) calculates the period from starting the operations of the air conditioner (1) to the moment when the flexion point in the measured room temperature occurs (hereinafter, referred to as the " flexion point occurrence period"). Subsequently, the start control device (33) sets the point in time that precedes a desired time by the flexion point occurrence period as the time at which the air conditioner (1) is scheduled to start operation. When the current time comes to match ...

Air-conditioning apparatus

... [Name of Document] [Abstract] [Object] An air-conditioning apparatus that can minimize an intermittent operation of the compressor so that a decrease in efficiency of the air conditioning apparatus caused by the intermittent operation and a variation of an indoor inlet temperature caused by the intermittent operation can be reduced. [Solution] It is determined whether thermo-off postponement control is allowed or not on the basis of a current compressor operating frequency when a thermo off condition is satisfied. If it is determined that thermo-off postponement control is allowed, the thermo-off postponement control in which a lowest operating frequency in an operating frequency range of a compressor 1 is temporarily reduced within a range greater than or equal to a minimum operating frequency of the compressor 1 in use so as to continue an operation. If it is determined that thermo-off postponement control is not allowed, thermo-off of stopping the compressor 1 is performed. [Selected ...

Air conditioner

... [Problem] To provide an air conditioner that avoids delaying restoring heating operation by way of performing de-icing operation control in accordance with installation conditions. [Solution] An outdoor unit control unit (200) has a de-icing operation condition table (300a) that specifies a de-icing operation interval time (Tm) in accordance with the sum of the rated capacities of indoor units (5a-5c) and the length of refrigerant pipes, which is the length of a liquid pipe (8) or a gas pipe (9). The outdoor unit control unit (200) refers to the de-icing operation condition table (300a) and determines the de-icing operation interval time (Tm) by using the sum of the rated capacities of indoor units (5a-5c) input by an installation information input unit (250). In addition, the outdoor unit control unit (200) forcibly executes de-icing operation if the de-icing operation interval time (Tm) has expired and de-icing operation start conditions have not been met from when the previous de-icing ...

Air conditioner

... [Problem] To provide an air conditioner that avoids delaying restoring heating operation by way of performing de-icing operation control in accordance with installation conditions. [Solution] An outdoor unit control unit (200) has a de-icing operation condition table (300a) that specifies a de-icing operation interval time (Tm) in accordance with the sum of the rated capacities of indoor units (5a-5c) and the length of refrigerant pipes, which is the length of a liquid pipe (8) or a gas pipe (9). The outdoor unit control unit (200) refers to the de-icing operation condition table (300a) and determines the de-icing operation interval time (Tm) by using the sum of the rated capacities of indoor units (5a-5c) input by an installation information input unit (250). In addition, the outdoor unit control unit (200) forcibly executes de-icing operation if the de-icing operation interval time (Tm) has expired and de-icing operation start conditions have not been met from when the previous de-icing ...

A refrigeration system and a separator therefor

SYSTEMS AND METHODS FOR CONTROLLING A VARIABLE SPEED WATER PUMP

Systems and methods for providing an improved strategy for controlling a variable speed water pump in a vehicle. In some embodiments, more than one water pump speed function is calculated based on values obtained from vehicle sensors, and a controller chooses among the water pump speed function results to set a water pump speed. In some embodiments, the water pump speed is increased when driveline torque is greater than a threshold amount for an amount of time that varies based on the driveline torque. In some embodiments, ambient temperature is considered while determining whether the water pump should provide full coolant flow to an auxiliary coolant loop of a trailer.

VARIABLE SPEED REFRIGERATION SYSTEM

A refrigerator incorporates a variable speed refrigeration system including a variable speed compressor, a variable speed evaporator fan, a variable speed fresh food compartment stirring fan and a variable position damper. Various temperature sensors are provided to sense system parameters which are used by a controller to regulate each of the variable components in order to compensate for temperature changes within at least one refrigerator compartment in a highly effective, energy efficient and synergistic manner.

TEMPERATURE REGULATION SYSTEM WITH HYBRID REFRIGERANT SUPPLY AND REGULATION

The present invention provides a temperature regulation system with hybrid refrigerant supply and regulation in which a pressure-reducing regulator (R100) from an evaporator (EVA100) controlled by a switch valve (V100) being installed between a condenser (CON 100) and the evaporator (EVA100), and a refrigerant injector (IJ100) being installed between the condenser (CON100) and the evaporator (EVA100), and an electric control unit (ECU100) being provided for controlling the switch valve (V100) and the pressure-reducing regulator (R100) or for controlling the refrigerant injector (IJ100) such that both or at least one thereof being served to transport the refrigerant (REF100) to the interior or exterior of the evaporator (EVA100).

METHOD AND APPARATUS FOR CONTROLLING TEMPERATURE FOR FORMING ICE WITHIN AN ICEMAKER COMPARTMENT OF A REFRIGERATOR

METHOD AND APPARATUS FOR CONTROLLING TEMPERATURE FOR FORMING ICE WITHIN AN ICEMAKER COMPARTMENT OF A REFRIGERATOR

A method of controlling temperature for forming ice within an icemaker compartment of a refrigerator is disclosed. The method includes the steps of activating at least one of the compressor and the coolant pump during an icemaking cycle to provide cooling to the icemaker compartment sufficient to make ice at a first rate, and increasing operation of at least one of the compressor and the coolant pump to provide cooling to the icemaker compartment sufficient to make ice at a second rate, which is faster than the first rate. A related refrigerator is also disclosed.

Energy-saving climatic test chamber and method of operation

Power conversion device and with the power conversion device of the air conditioning device

COMPRESSOR AND CONTROL METHOD THEREOF

The present invention relates to a compressor and a control method thereof, more specifically, wherein the compressor comprises: a housing unit having an internal space in which refrigerant and a compression unit compressing the refrigerant are accommodated; an oil foaming sensor unit provided with a pair of electrode units protruding to the inside of the refrigerant accommodated in the housing unit to measure a capacitance value between the electrode units; and a control unit controlling the number of rotations of the compressor in accordance with the capacitance value measured by the oil foaming sensor unit. Therefore, durability of the compressor can be improved by preventing the compressor from being damaged and broken by an oil foaming phenomenon. COPYRIGHT KIPO 2018 ...

일련의 크라이오제닉 압축기에서 유체의 압력 및 온도를 제어하는 방법

... 일련의 크라이오제닉 압축기에서 유체, 특히 헬륨의 압력 및 온도를 제어하는 방법으로서, 각 압축기(V1, V2, V3, V4)에 대해 실제 회전 속도를 검출하는 단계와, 일련의 압축기 중 가장 상류의 제1 압축기(V1)의 진입부에서 실제 유입 온도(Tactual) 및 실제 유입 압력(pactual)을 검출하는 단계와, 일련의 압축기 중 각 압축기(V1, V2, V3, V4)에 대한 최대 속도(ni, max), 및 일련의 압축기 중 제1 압축기(V1)에 대해 희망 유입 압력(ptarget)을 제공하는 단계와, 각 압축기(V1, V2, V3, V4)의 최대 속도(ni, max) 및 실제 속도(ni)로부터 각 압축기(V1, V2, V3, V4)에 대해 속도 지수(Di)를 결정하는 단계와, 실제 유입 압력의 희망 유입 압력(pdesired)으로부터의 편차로부터 비례값(prop)을 결정하는 단계와, 2개의 값, 비례값(prop) 및 일련의 압축기 중 모든 압축기(V1, V2, V3, V4)의 가장 작은 속도 지수(Di) 중 보다 작은 값으로부터 우선순위값(PW)을 결정하는 단계와, 우선순위값(PW)의 도움으로, 일련의 압축기 중 제1 압축기(V1)에 대해 희망 유입 압력(pdesired)과, 각 압축기(V1, V2, V3, V4)에 대해 희망 속도(n1desired, n2desired, n3desired, n4desired)를 결정하는 단계와, 결정된 희망 유입 온도(Tdesired)에 대해 제1 압축기(V1)의 실제 유입 온도(Tactual)를 조절하는 단계와, 결정된 희망 속도(n1desired, n2desired, n3desired, n4desired)에 대해 각 압축기(V1, V2, V3, V4)의 실제 속도(ni)를 조절하는 단계를 포함하는 방법이 제안된다.

Solid state control system

A control system to selectively control the operation of the compressor of a mini-split air conditioning system including at least one remote evaporator operatively coupled to the compressor to receive refrigerant therethrough, a sensor to monitor the operation of the evaporator and to generate an operating control signal to turn-off the compressor when a predetermined operating condition is sensed at the evaporator and a condensate drain pan to receive or catch condensate from the evaporator, the control system comprising a condensate sensor disposed to sense condensate in the condensate drain pan at a predetermined level and to generate a condensate level signal fed to a battery powered control device including an isolated solid state relay coupled to the sensor by a control coupling device to generate a condensate level control signal fed to the sensor causing the sensor to generate the operating control signal fed to turn off the compressor when condensate within the condensate drain pan reaches the predetermined level.

Refrigerator energy and temperature control

Apparatus and methodologies are provided to improve the refrigeration system by precisely controlling refrigerator compartment and heat exchanger temperatures through continuous modulation of device speeds or positions to match capacity with instantaneous load. A controller in a refrigerator is configured to provide a plurality of control loops to control various operational aspects of selected components in the refrigerator. A first loop controls the operating speed of a compressor based on temperature of the evaporator or based on the desired speed of an evaporator fan. A second control loop controls speed of an evaporator fan to maintain a prescribed freezer compartment temperature. A third control loop maintains a prescribed temperature in a fresh food compartment. In certain embodiments selected of the control loops may be thermodynamically coupled by way of thermal interaction between the various cooled compartments rather than being electrically coupled. The control loops may be individually configured as one of a proportional, proportional-integral, or proportional-integral-derivative control loop.

Air conditioner

It is an object of the present invention to provide an air conditioner for inhibiting noise increase and heating performance degradation due to frost attachment onto an outdoor heat exchanger. In an air conditioner ( 1 ), a determining part ( 43 ) of a control unit ( 4 ) determines that the amount of frost attaching onto an outdoor heat exchanger ( 13 ) is increased when a difference between an outdoor temperature To and an outdoor heat exchanger temperature Te is increased, and executes a frost attaching condition operation control for reducing the rotation speed of an outdoor fan ( 23 ). The operating frequency of the compressor ( 11 ) is herein increased in accordance with the reduction amount of the temperature of an indoor heat exchanger ( 15 ). The control unit ( 4 ) includes change amounts preliminarily set for changing the operating frequency of the compressor ( 11 ) in stages. The change amounts correspond to the stages on a one-to-one basis. The control unit ( 4 ) increases the operating frequency of the compressor ( 11 ) by corresponding one of the change amounts required for upgrading a present stage of the operating frequency of the compressor ( 11 ) to a stage immediately higher than the present stage every time the temperature of the outdoor heat exchanger ( 15 ) is reduced by a predetermined amount, and reduces the rotation speed of the outdoor fan ( 23 ) in accordance with the change amount.

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.

Refrigerator

A refrigerator includes a compressor to compress refrigerant, a condenser to liquefy the refrigerant supplied from the compressor, a capillary tube to decompress and expand the refrigerant supplied from the condenser, an evaporator to vaporize the refrigerant supplied from the capillary tube, a shutoff valve installed at an inlet of the capillary tube so as to prevent the refrigerant in the condenser during stoppage of the compressor from being moved to the evaporator, and a control unit to enable the shutoff valve to be blocked together so as to prevent movement of the refrigerant from the condenser to the evaporator during stoppage of the compressor, and to enable the shutoff valve to be opened together so as to move the refrigerant from the condenser to the evaporator during starting of the compressor.

Heat Pumps With Unequal Cooling and Heating Capacities for Climates Where Demand for Cooling and Heating are Unequal, and Method of Adapting and Distributing Such Heat Pumps

Heat pumps for climates where demand for cooling and heating are unequal and methods of adapting and distributing heat pumps for such climates. Heat pumps include a compressor, compressor motor, variable-speed drive, and controller. In a number of embodiments, non-volatile memory stores sets of constant speeds for cooling and heating, and a person can select, via an input device, different sets of speeds for cooling and heating to provide the different cooling and heating capacities. The controller then operates the unit at the selected speeds, selecting from within the set based on demand for cooling or heating. In some embodiments, different sets of speeds may have the same minimum speed but different maximum speeds. Identical heat pumps can be configured to have different capacity ratings and different advertized efficiencies for different climates.

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.

Single-screw compressor

A screw compressor includes a screw rotor, a gate rotor, a drive mechanism to rotate the screw rotor, a cylinder, a discharge port and an adjustment mechanism. The screw rotor has an outer periphery with a helical groove engaged with radially arranged gates of the gate rotor. First and second axial ends of the screw rotor form suction and discharge sides, respectively. The cylinder accommodates the screw rotor to define a compression chamber in the helical groove. Fluid in the coin cession chamber flows through the discharge port toward the discharge side of the screw rotor. The adjustment mechanism is configured to adjust a compression ratio of the compression chamber within a predetermined. range. The adjustment mechanism adjusts the compression ratio to a minimum compression ratio immediately before or when operation of the adjustment mechanism is stopped.

Method of operating a refrigeration system for a mobile cargo container

A method of operating a refrigeration system for a refrigerated mobile cargo container includes sensing a temperature outside of the refrigerated mobile cargo container, detecting a position of a door on the refrigerated mobile cargo container, and activating the refrigeration system if the door is open and the temperature outside of the refrigerated mobile cargo container is less than a predetermined value.

Method for Controlling a Heat-Transfer Fluid-Compression Device of a Cryogenic Machine

Method for controlling a heat-transfer fluid compression device ( 3 ) of a cryogenic machine, the compression device comprising a plurality of members including a compressor ( 4 ) and a first controlled valve (CV956) mounted in parallel, wherein the method comprises the real-time generation of a control of the compressor and the real-time generation of a control of the first controlled valve.

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.

Refrigerator and defrosting method thereof

A refrigerator according to the present invention includes a compressor compressing a coolant, a condenser condensing the coolant compressed in the compressor, an expander through which the coolant condensed in the condenser passes, an evaporator evaporating the coolant expanded in the expander and cooling an inside of the refrigerator, a defroster defrosting the evaporator, a coolant adjusting valve adjusting the coolant flowing from the condenser to the evaporator, and a controller driving the compressor and turning on the defroster after closing the coolant adjusting valve. The refrigerator may minimize power consumed for defrosting and the defrosting time.

Combined air-conditioning and hot-water supply system

A combined air-conditioning and hot-water supply system that, if a temperature that is set in a hot-water supply unit is higher than a temperature of refrigerant discharged from a compressor when the combined air-conditioning and hot-water supply system is in a heating operation cycle state, increases a target condensing temperature of an outdoor unit above the target condensing temperature that has been set, and controls an opening degree of an indoor expansion device to be less than the opening degree that has been set, such that a heating load of an indoor unit is maintained constant.

Refrigeration controller

A refrigeration controller within a retail refrigeration cabinet controls the temperature ( 502 ) so that it approaches the maximum allowable temperature by using the most efficient fan speed for loading and time of day ( 507 ) but is varied by customer presence ( 505 ) to adhere to an algorithm reducing the noise ( 506 ) created by such machines while still creating sufficient cooling to remain within the maximum temperature while providing acceptable power economy.

Heating/cooling system for indwelling heat exchange catheter

A cooling system for an indwelling heat exchange catheter includes a heat exchange bath that is configured to receive a conduit that carries saline to and from the catheter. A heating/cooling fluid is in the bath and exchanges heat with the saline. The heating/cooling fluid flows through a heat exchanger that includes a refrigerant and two variable speed DC compressor for removing heat from the refrigerant. A gear pump circulates the working fluid to and from the catheter and is removably engaged with a pump support platform.

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).

Startup Control Systems And Methods To Reduce Flooded Startup Conditions

A refrigeration system includes a startup mode control module that receives an off time of a compressor of the refrigeration system and an ambient temperature, determines whether the off time and the ambient temperature indicate that the compressor is in a flooded condition, and selects, based on the determination, between a normal startup mode and a flooded startup mode. A compressor control module operates the compressor in the normal startup mode in response to the startup mode control module selecting the normal startup mode, in the flooded startup mode in response to the startup mode control module selecting the flooded startup mode, and transitions from the flooded startup mode to the normal startup mode after a predetermined period associated with operating in the flooded startup mode. The compressor is operated at a first speed in the normal startup mode and at a second speed in the flooded startup mode.

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 ...

SCROLL COMPRESSORS WITH DIFFERENT VOLUME INDEXES AND SYSTEMS AND METHODS FOR SAME

A plurality of scroll compressors with different fixed volume indexes are connected in fluid parallel circuit and configured to selectively operate to maximize isentropic efficiency at different condensing temperatures. Different quantities of scroll compressors of different volume indexes may be selected based upon typical climate or geographic location environmental conditions to attempt to maximize efficiency. A controller may selectively operate different combinations of the compressors of different volume indexes bases up load demands and condensing temperature conditions, which may be determined in a variety of ways. 1. A compressor arrangement , comprising:a plurality of refrigerant compressors connected in parallel circuit, each refrigerant compressor having a volume index, the plurality of refrigerant compressors including at least a first compressor and a second compressor, wherein each of the first compressor and the second compressor include a single inlet, single outlet, and a single flowpath extending between the single inlet and the single outlet, and wherein each of the first compressor and the second compressor includes a housing and a motor contained within said housing, the first compressor having a different volume index than each second compressor, wherein the volume index of the first compressor and the second compressor is fixed and non-variable.2. The compressor arrangement of claim 1 , wherein the first and second compressors are scroll compressors.3. The compressor arrangement of claim 2 , wherein in relative relation between the first and second compressors claim 2 , each first compressor has a higher isentropic efficiency at a high temperature range for saturated condensing temperature claim 2 , and wherein each second compressor has a higher isentropic efficiency at a low temperature range for saturated condensing temperature claim 2 , the high temperature range being higher than the low temperature range.4. The compressor arrangement of ...

MAGNETIC BEARING COMPRESSOR PROTECTION

A vapor compression system and method for operating the vapor compression system are provided. The vapor compression system includes a first compressor, a second compressor, a condenser, and at least one check valve disposed between the first compressor and the condenser. The method provides for the transmitting of a shutdown command to at least one of the first compressor and the second compressor, at least one of the first compressor and the second compressor including a rotating shaft and a magnetic bearing, the magnetic bearing having an active mode and an inactive mode, the magnetic bearing levitating the rotating shaft in the active mode. The method further provides for the monitoring of at least one of a rotational speed of the rotating shaft and a differential pressure over the check valve for a preset time, wherein the magnetic bearing remains in the active mode at least during the preset time. 1. A method of operating a vapor compression system comprising a first compressor , a second compressor , a condenser , and at least one check valve disposed between the first compressor and the condenser , the method comprising:transmitting a shutdown command to at least one of the first compressor and the second compressor, at least one of the first compressor and second compressor comprising a rotating shaft and a magnetic bearing, the magnetic bearing comprising an active mode and an inactive mode, the magnetic bearing levitating the rotating shaft in the active mode; andmonitoring at least one of a rotational speed of the rotating shaft and a differential pressure over the check valve for a preset time, wherein the magnetic bearing remains in the active mode at least during the preset time.2. The method of claim 1 , wherein the preset time is less than ten minutes after the shutdown command is transmitted.3. The method of claim 1 , further comprising switching the magnetic bearing from the active mode to the inactive mode when the rotational speed reaches an ...

Multi Purpose Multistage Evaporative Cold Water and Cold Air Generating and Supply System

This discloses apparatuses for industrial or commercial cooling (or any other cooling) using staged cooling towers to evaporatively reach temperatures below the wet bulb temperature of the ambient air. Methods for using such apparatuses are disclosed as well. 120-. (canceled)22. The system of wherein a cooling circuit connects the FS cooling fluid reservoir claim 21 , the primary cooling load claim 21 , and a means for supplemental cooling (SCM).23. The system of wherein the SCM comprises:thermally driven adsorption chillers supplying water or water-glycol solution;thermally driven absorption supplying water or water-glycol solution;conventional mechanical water chillers;natural cold fluid sources;river water;sea or ocean water;lake water; orgeothermal water.24. The system of further comprising a computer-based command-and-control system that is configured to control the SCM.26. The system of wherein the IS cooling tower or the FS cooling tower is selected from cross-flow or counter-flow cooling towers.27. The system of wherein the FS cooling fluid reservoir connects to a final cooling coil of the primary cooling load.28. The system of wherein a cooling circuit connects the FS cooling fluid reservoir claim 27 , the primary cooling load claim 27 , and a means for supplemental cooling (SCM).29. The system of wherein the circuit additionally comprises at least one pump or variable-speed pump.30. The system of further comprising a computer-based command-and-control system that is configured to control the SCM.31. The system of wherein the computer-based command-and-control system adjusts an IS variable-speed fan or variable-speed pump claim 30 , a MS variable-speed fan or variable-speed pump claim 30 , or a FS variable-speed fan or variable-speed pump.32. The system of wherein the computer-based command-and-control system is adapted to adjust fan speed in response to a monitored cooling load.33. The system of wherein the computer-based command-and-control system is ...

MULTI-COMPRESSOR CLIMATE SYSTEM

Disclosed are climate systems and methods for control the climate systems. A climate system includes a plurality of compressors, a first heat exchanger disposed downstream of the compressors and a second heat exchanger disposed downstream of the first heat exchanger. The compressors and heat exchangers are fluidly connected by refrigerant lines to form a refrigerant circuit. The climate system also includes a controller that controls the operation of the compressors to draw back lubricant to the compressors without use of an oil equalization system. 1. A climate system for conditioning air within a compartment of a vehicle , comprising:a first compressor that includes a first oil sump;a second compressor that includes a second oil sump, independent of the first oil sump;a first refrigerant-to-air heat exchanger fluidly coupled to the first and second compressors and thermally coupled to an exterior of the vehicle;a second refrigerant-to-air heat exchanger fluidly coupled to the first refrigerant-to-air heat exchanger and thermally coupled to the compartment of the vehicle;refrigerant lines fluidly connecting the first and second compressors and the first and second heat exchangers to form a refrigerant circuit; anda controller communicatively coupled to the first and second compressors and including instructions that are configured to selectively draw back compressor oil from the refrigerant lines to at least one of the first and second oil sumps by adjusting an operating speed of at least one of the first and second compressors.2. The climate system of claim 1 , wherein the controller is configured to:draw oil back to the first oil sump by lowering a speed of the first compressor for a first time period; anddraw oil back to the second oil sump by lowering a speed of the second compressor for a second time period.3. The climate system of claim 1 , wherein the first oil sump and the second oil sump are not connected by an oil equalizing system.4. The climate 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 ...

VECTOR DRIVE FOR VAPOR COMPRESSION SYSTEMS

Described is a vector control system for a vapor compression circuit. The vector control system may monitor the vapor compression circuit and adjust the speed of one or more motors to increase efficiency by taking into account the torque forces placed on a compressor motor. 1. A vapor compression system , comprising:at least one compressor having an inlet pressure and an outlet pressure;at least one evaporator;at least one condenser;a refrigerant expansion device; anda vector control system configured to control the speed of the compressor to satisfy a load and also configured to control the torque of the compressor by adjusting the airflow across the evaporator, the condenser, or both.2. The vapor compression system of claim 1 , wherein adjusting the airflow across the evaporator claim 1 , the condenser claim 1 , or both changes the inlet or outlet pressure of the compressor to increase the energy efficiency of the vapor compression system.3. The vapor compression system of claim 1 , where the vapor compression system comprises an HVAC system that provides cooling to an airflow or liquid.4. The vapor compression system of claim 1 , wherein the system comprises a refrigeration system providing refrigeration to an airflow or heat transfer fluid or suction to a low pressure receiver.5. The vapor compression system of claim 1 , wherein the vapor compression system comprises a heat pump that provides heating to an air flow or liquid.6. The vapor compression system of claim 1 , wherein the system comprises one or more reversing valves to allow the system to operate as a heat pump.7. The vapor compression system of claim 1 , wherein the refrigerant expansion device is a pulsing expansion valve.8. The vapor compression system of claim 1 , wherein the system comprises two evaporators and two condensers that are staged such that a lower stage first condenser transfers heat to a higher stage second evaporator and thermal energy is transferred from the lower stage first ...

REFRIGERATOR CONTROLLING METHOD AND SYSTEM WITH LINEAR COMPRESSOR

The present invention discloses a refrigerator controlling method and system with a linear compressor. The method comprises: monitoring an environment temperature T of the refrigerator located in the environment comparing the environment temperature T with a preset environment temperature threshold T if T is larger than T controlling a refrigerating unit and/or a heating unit in the refrigerator such that the refrigerator runs under a first operation condition; and if T is smaller than or equal to T controlling the refrigerating unit and/or the heating unit in the refrigerator such that the refrigerator runs under a second operation condition. When the linear compressor runs within predetermined time, a refrigeration amount of the linear compressor under the second operation condition is controlled to be larger than a refrigeration amount of the linear compressor under the first operation condition, such that a compartment of the refrigerator reaches a target temperature. 1. A refrigerator controlling method with a linear compressor , the method comprising:monitoring an environment temperature T of the refrigerator located in the environment;{'b': '0', 'comparing the environment temperature T with a preset environment temperature threshold T;'}{'b': '0', 'if T is larger than T, controlling a refrigerating unit and/or a heating unit in the refrigerator such that the refrigerator runs under a first operation condition; and'}{'b': '0', 'if T is smaller than or equal to T, controlling the refrigerating unit and/or the heating unit in the refrigerator such that the refrigerator runs under a second operation condition;'}wherein, when the linear compressor runs within predetermined time, controlling a refrigeration amount of the linear compressor under the second operation condition to be larger than a refrigeration amount of the linear compressor under the first operation condition, such that a compartment of the refrigerator reaches a target temperature.2. The method of ...

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 ...

AIR CONDITIONING DEVICE USING VAPOR INJECTION CYCLE AND METHOD FOR CONTROLLING THE DEVICE

An air conditioning device includes a vapor injection cycle in which an operating speed of a compressor is adjusted to improve efficiency, and a method for controlling the device. The air conditioning device includes an inner heat-exchanger for exchanging heat between a first portion of refrigerant passing through a condenser and a second portion of the refrigerant branched from the first refrigerant, and an injection channel through which the second portion of the refrigerant is injected into the compressor. The inner heat exchanger includes an outer tube and an inner tube disposed inside the outer tube. The first portion of the refrigerant flows into the inner tube, while the second portion of the refrigerant flows into the outer tube. Thus, when a variation of air-conditioning load is small and an injection super-heating temperature is low, the device enables reduction of the compressor rotation speed to ensure high injection super-heating temperature. 1. An air conditioning device for use in performing a refrigeration cycle , the device comprising:a compressor for compressing refrigerant;a condenser for condensing the refrigerant from the compressor;an inner heat-exchanger for exchanging heat between a first portion of the refrigerant passing through the condenser and a second portion of the refrigerant branched from the first portion of the refrigerant;an injection channel through which the second portion of the refrigerant is injected into the compressor;a main expansion valve for regulating flow of the first portion of the refrigerant coming from the inner heat-exchanger; and wherein the inner heat exchanger includes an outer tube and a plurality of inner tubes disposed inside the outer tube, and', 'wherein the first portion of the refrigerant flows into the inner tubes, while the second portion of the refrigerant flows between the outer tube and the inner tubes., 'an injection expansion valve for controlling flow of the second portion of the refrigerant ...

Closed Loop Capacity And Power Management Scheme For Multi Stage Transport Refrigeration System

A unit, such as a transport refrigeration unit 12, may include a plurality of components arranged in multiple stages. At least a portion of the components 18,20 may be arranged in a serial or parallel manner. A position associated with the plurality of components may be selected to control a load on a power source, such as an engine 30. For example, a position for each of the components may be selected so as to maximize a delivery of available power from the power source to the unit. In some embodiments, one or more controllers 32,34 may measure a parameter associated with the power source and select a position for one or more of the components. In some embodiments, an economized refrigeration cycle may be used. Capacity may be staged from a single stage compression cycle or mode to a multistage compression cycle or mode, with a corresponding increase in capacity via subcooling.

Screw compressor

A screw compressor includes a screw rotor, a gate rotor, and a speed adjuster. The screw rotor has an outer peripheral surface with a plurality of screw grooves. The screw rotor is configured to be rotated. The gate rotor has a plurality of teeth. A ratio T/S of a number T of the teeth to a total number S of the screw grooves is greater than or equal to 2.5. The gate rotor meshes with the screw rotor. The speed adjuster is configured to adjust a rotational speed of the screw rotor. Rotation of the screw rotor at an angle greater than 180° allows the screw compressor to perform a stroke from start of compression to completion of discharge.

A METHOD FOR CONTROLLING A VAPOUR COMPRESSION SYSTEM BASED ON ESTIMATED FLOW

A method for controlling a vapour compression system () including a compressor unit () including at least two compressors (), a heat rejecting heat exchanger (), a receiver (), an expansion device () and an evaporator () arranged in a refrigerant path is disclosed. At least one of the compressors is a main compressor () being fluidly connected to an outlet of the evaporator () and at least one of the compressors is a receiver compressor () being fluidly connected to a gaseous outlet () of the receiver (). A flow of vapour entering the receiver (), such as a mass flow of vapour entering the receiver () is estimated and compared to a first threshold value. In the case that the estimated flow is above the first threshold value, a pressure prevailing inside the receiver () is controlled by operating the receiver compressor (). 1. A method for controlling a vapour compression system comprising a compressor unit comprising at least two pressors , a heat rejecting heat exchanger , a receiver , an expansion device and an evaporator arranged in a refrigerant path , the expansion device being arranged to control a supply of refrigerant to the evaporator , at least one of the compressors being a main compressor being fluidly connected to an outlet of the evaporator and at least one of the compressors being a receiver compressor being fluidly connected to a gaseous outlet of the receiver , the method comprising the steps of:estimating a flow of vapour entering the receiver,comparing the estimated flow to a first threshold value, andin the case that the estimated flow is above the first threshold value, controlling a pressure prevailing inside the receiver by operating the receiver compressor.2. The method according to claim 1 , wherein the first threshold value is related to a minimum capacity of the receiver compressor.3. The method according to claim 1 , wherein the step of estimating the flow of vapour entering the receiver is performed based on a current compressor capacity ...

A METHOD FOR CONTROLLING A VAPOUR COMPRESSION SYSTEM AT A REDUCED SUCTION PRESSURE

A method for controlling a vapour compression system () including a compressor unit () including one or more compressors (), a heat rejecting heat exchanger (), a receiver (), an expansion device () and an evaporator () arranged in a refrigerant path. A pressure value indicating a pressure prevailing inside the receiver () is obtained, and the obtained pressure value is compared to a first threshold pressure value. In the case that the obtained pressure value is below the first threshold pressure value, the compressor(s) () of the compressor unit () are controlled in order to reduce a suction pressure of the vapour compression system (). 1. A method for controlling a vapour compression system comprising a compressor unit comprising one or more compressors , a heat rejecting heat exchanger , a receiver , an expansion device and an evaporator arranged in a refrigerant path , the expansion device being arranged to control a supply of refrigerant to the evaporator , the method comprising the steps of:obtaining a pressure value indicating a pressure prevailing inside the receiver,comparing the obtained pressure value to a first threshold pressure value, andin the case that the obtained pressure value is below the first threshold pressure value, controlling the compressor(s) of the compressor unit in order to reduce a suction pressure of the vapour compression system.2. The method according to claim 1 , wherein the step of controlling the compressor(s) of the compressor unit comprises the steps of:{'sub': 0,set', '0,red, 'reducing a suction pressure setpoint value from an initial suction pressure setpoint value, P, to a reduced suction pressure setpoint value, P, and'}{'sub': '0,red', 'controlling the compressor(s) of the compressor unit based on the reduced suction pressure setpoint value, P.'}3. The method according to claim 1 , wherein the step of reducing the suction pressure comprises increasing the compressor capacity of the compressor unit.4. The method according ...

System and Method for Controlling Vapor Compression Systems

A method controls a vapor compression system including a variable speed compressor. A desired discharge temperature of the compressor is determined using a mapping between values of the discharge temperature of the compressor and values of speed of the compressor and outdoor air temperature. A transition function for transitioning a current discharge temperature to the desired discharge temperature is determined, such that the transition function is continuous and a rate of change of the transition function is limited. Next, a valve of the vapor compression system is controlled such that the discharge temperature is transitioned to the desired discharge temperature based on the transition function. 1. A method for controlling a vapor compression system including a variable speed compressor , comprising:determining a desired discharge temperature of the compressor using a mapping between values of the discharge temperature of the compressor and values of speed of the compressor and outdoor air temperature;determining a transition function for transitioning a current discharge temperature to the desired discharge temperature, such that the transition function is continuous and a rate of change of the transition function is limited; andcontrolling a valve of the vapor compression system such that the discharge temperature is transitioned to the desired discharge temperature based on the transition function, wherein steps of the method are performed by a processor.2. The method of claim 1 , wherein the transition function determines a rate-limited desired discharge temperature as a function of time claim 1 , and wherein the controlling comprises:receiving a measurement of an actual discharge temperature;determining the rate-limited desired discharge temperature using the desired discharge temperature and the transition function;comparing the actual discharge temperature with the rate-limited desired discharge temperature to determine an error; andgenerating a command to ...

VARIABLE VOLUME RATIO COMPRESSOR

A compressor and method for controlling the volume ratio of a compressor is provided. The compressor includes a an intake passage, a discharge passage and a compression mechanism, the compression mechanism being positioned to receive vapor from the intake passage and provide compressed vapor to the discharge passage. At least one opening is positioned in the compression mechanism to bypass a portion of the vapor in the compression mechanism to the discharge passage, the at least one opening being sized and positioned to automatically vary a volume ratio in the compressor in response to a varying pressure differential between the intake passage and the discharge passage. 1. A compressor comprising:an intake passage;a discharge passage;a compression mechanism, the compression mechanism being positioned to receive vapor from the intake passage and provide compressed vapor to the discharge passage; andat least one opening positioned in the compression mechanism to bypass a portion of the vapor in the compression mechanism to the discharge passage;wherein the at least one opening being sized and positioned to automatically vary a volume ratio in the compressor in response to a varying pressure differential between the intake passage and the discharge passage.2. The compressor of claim 1 , wherein the volume ratio is variable between a partial load and a full load.3. The compressor of claim 1 , wherein the compressor is a screw compressor.4. The compressor of claim 3 , wherein the screw compressor includes a first rotor and a second rotor.5. The compressor of claim 4 , wherein the at least one opening is positioned in fluid communication with at least one of the first rotor and the second rotor.6. The compressor of claim 4 , wherein the at least one opening is positioned in fluid communication with each of the first rotor and the second rotor.7. The compressor of claim 6 , wherein at least a portion of the at least one opening is positioned symmetric to a plane positioned ...

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 ...

COMPRESSOR CHILLER SYSTEMS INCLUDING THERMOELECTRIC MODULES, AND CORRESPONDING CONTROL METHODS

According to various aspects, exemplary embodiments are disclosed of chiller systems including thermoelectric modules, and corresponding control methods. In an exemplary embodiment, a compressor chiller system generally includes a refrigerant loop having a refrigerant fluid, a compressor connected in the refrigerant loop to compress the refrigerant fluid, and a condenser connected in the refrigerant loop to receive the compressed refrigerant fluid from the compressor and to condense the compressed refrigerant fluid. The system also includes a heat transfer component connected in the refrigerant loop to receive the condensed refrigerant fluid from the condenser, and a coolant loop having a coolant fluid. The heat transfer component is connected in the coolant loop to transfer heat from the coolant fluid to the condensed refrigerant fluid. The system further includes a thermoelectric module connected in the coolant loop. The thermoelectric module is adapted to transfer heat into and/or out of the coolant fluid. 1. A compressor chiller system comprising:a compressor configured to compress a refrigerant fluid; anda thermoelectric module adapted to transfer heat into a coolant fluid for increasing temperature of the coolant fluid and to transfer heat out of the coolant fluid for decreasing the temperature of the coolant fluid, such that the thermoelectric module is operable for controlling the temperature of the coolant fluid, whereby the thermoelectric module is operable for providing additional cooling capacity when a cooling demand of the compressor chiller system exceeds a maximum cooling capacity of the compressor thereby enabling the compressor to run continuously which reduces compressor turn on and turn off events.2. The system of claim 1 , wherein the system includes a refrigerant loop having the refrigerant fluid claim 1 , and wherein the compressor is connected in the refrigerant loop.3. The system of claim 2 , wherein the system includes a condenser connected ...

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 ...

Motor driving device and air conditioner

A motor driving device and an air conditioner are capable of increasing the efficiency in a low speed region in which a motor performs low speed rotation. The motor driving device that is a motor driving device for driving a motor including stator windings, includes: a connection switching unit that switches connection condition of the stator windings to either of first connection condition and second connection condition different from the first connection condition; and an inverter that converts a DC voltage into AC drive voltages and supplies the AC drive voltages to the stator windings. The inverter includes MOS transistors as switching elements.

REFRIGERATION CYCLE APPARATUS

A refrigeration cycle apparatus includes: a refrigerant circuit including a compressor, a condenser, an expansion device, and an evaporator; a first detector provided to the compressor, and configured to detect a temperature of the compressor; a second detector provided between the compressor and the expansion device in the refrigerant circuit, and configured to detect one of a temperature of refrigerant and a pressure of the refrigerant; and a controller configured to control at least one of frequency of the compressor and an opening degree of the expansion device based on the temperature detected by the first detector and one of the temperature and the pressure detected by the second detector so as to maintain a concentration of a refrigerating machine oil dissolved in the refrigerant in the compressor and an oil level of the refrigerating machine oil in the compressor within respective predetermined ranges. 1. A refrigeration cycle apparatus comprising:a refrigerant circuit including a compressor, a condenser, an expansion device, and an evaporator;a first detector provided to the compressor, and configured to detect a temperature of the compressor;a second detector provided between the compressor and the expansion device in the refrigerant circuit, and configured to detect one of a temperature of refrigerant and a pressure of the refrigerant;an oil separator connected to a refrigerant discharge side of the compressor, and configured to separate a refrigerating machine oil from the refrigerant;an oil return pipe connecting the oil separator and a refrigerant suction side of the compressor, and configured to return the refrigerating machine oil stored in the oil separator;an oil regulating valve provided in the oil return pipe, and configured to open and close a flow path of the oil return pipe;an oil separation switching valve connected to the refrigerant discharge side of the compressor and the oil separator, and configured to switch to connect the compressor ...

Systems And Methods For Multi-Stage Operation Of A Compressor

A system for controlling a capacity of a compressor includes a motor of the compressor including a main winding connected at a connection point to an auxiliary winding and a drive configured to control a speed of the motor. The system includes a first switch configured to selectively connect the main winding to either a first line voltage or a first output of the drive, a second switch configured to selectively connect the connection point to either a second line voltage or a second output of the drive, and a third switch configured to selectively connect the auxiliary winding to either a capacitor or a third output of the drive. The system includes a solenoid valve configured to selectively either operate in a first capacity or a second capacity. The system includes a control module configured to control the drive, the first switch, the second switch, and the third switch.

Hybrid tandem compressor system and method of use

A compressor system includes a variable-speed compressor and a fixed-speed compressor. A control unit is operatively coupled to the variable-speed compressor and is operatively coupled to the fixed-speed compressor. A sensor is operatively coupled to the control unit and disposed in an enclosed space. The sensor measures at least one of a temperature and a relative humidity of the enclosed space and determines an HVAC load of the enclosed space. Responsive to a determination of the HVAC load, the control unit directs operation of the variable-speed compressor and the fixed-speed compressor.

VENTILLATION CONTROLLER FOR EQUIPMENT ENCLOSURE

An HVAC controller for an equipment enclosure or machine room employs ambient air exchange and compressor driven cooling appliances for maintaining an operating temperature of a telecommunications machine room within acceptable levels. Coordinated engagement of the ambient air exchange and a plurality of lead/lag cooling appliances provides staged engagement of the cooling appliances to correspond to a cooling demand. Designation of lead and lag cooling appliances is alternated according to a designation interval to avoid disproportionate use of individual cooling appliances for promoting longevity. Multiple cooling appliances alternate the lead/lag designation to equalize equipment wear, and alternation of the lead/lag designation follows an normal operational satisfaction of the cooling demand, to minimize a frequency of equipment engagement (power up) cycles which contribute to wear. 1. In an environmentally controlled space for housing electronic equipment between temperature ranges defined by an activation threshold for enabling an HVAC resource and a satisfaction threshold for disabling an HVAC resource , a method of controlling HVAC equipment comprising:receiving an engagement threshold defining engagement of environmental conditioning equipment;receiving a satisfaction threshold indicative of satisfaction of the environmental conditioning demand;energizing the conditioning equipment when the temperature in the equipment space reaches the engagement threshold; anddeenergizing the conditioning equipment when the temperature in the enclosure reaches the satisfaction threshold, the satisfaction threshold being different than the engagement threshold for incurring a longer interval during which the environmental conditioning equipment is operating.2. The method of wherein the HVAC equipment includes refrigeration compressors and the engagement threshold defines a higher temperature than the satisfaction threshold.3. The method of wherein the HVAC equipment ...

Rotating heat exchanger with tube coil

A heat exchanger includes a cylindrical stator and a cylindrical rotor that are spaced by a cylindrical gap. The cylindrical rotor is configured to rotate relative to the cylindrical stator about a rotation axis. A flattened tube is positioned within the cylindrical gap and is wrapped on the cylindrical stator. The flattened tube is spaced from a surface of the cylindrical rotor that faces the cylindrical gap.

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.

VFD CONTROL FOR MULTIPLE CIRCUIT REFRIGERATION SYSTEM

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

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.

AIR CONDITIONING SYSTEM WITH VAPOR INJECTION COMPRESSOR

An air conditioning system can be toggled between a heating mode, in which heat is withdrawn from a source (e.g., a geothermal source) and deposited into a conditioned space (e.g., a building), and a cooling mode, in which heat is withdrawn from the conditioned space and deposited into the source. The air conditioning system uses a combination of efficiency-enhancing technologies, including injection of superheated vapor into the system's compressor from an economizer circuit, adjustable compressor speed, the use of one or coaxial heat exchangers and the use of electronic expansion valves that are continuously adjustable from a fully closed to various open positions. A controller may be used to control the system for optimal performance in both the heating and cooling modes, such as by disabling the economizer circuit and vapor injection when the system is in the cooling mode. 1. A reversible heat pump system housed in a housing for heating and cooling a space , comprising:a refrigerant circuit through which refrigerant is configured to flow;a variable speed compressor disposed on the refrigerant circuit, the compressor including a compressor inlet, a compressor outlet, and a vapor injection inlet disposed between the compressor inlet and the compressor outlet;a coaxial load heat exchanger disposed on the refrigerant circuit to exchange heat between the refrigerant and either a cooling load or a heating load;a coaxial source heat exchanger disposed on the refrigerant circuit to exchange heat between the refrigerant and a source;a reversing valve disposed on the refrigerant circuit between the compressor and the load and source heat exchangers and selectable to effect a heating mode and a cooling mode, wherein in the heating mode the reversing valve routes the refrigerant from the compressor outlet to the load heat exchanger and routes the refrigerant from the source heat exchanger to the compressor inlet, wherein in the cooling mode the reversing valve routes the ...

Method for operating a chiller

A method of operating a chiller having a closed refrigerant loop including a compressor, a condenser and an evaporator. The refrigerant used in the loop defining a pressure-enthalpy curve representative of different phases (vapor, liquid and vapor, and liquid) of the refrigerant at different combinations of pressure and enthalpy. The loop defining a process cycle (compression, condensation, expansion, and evaporation) of the refrigerant during operation of the loop relative to the pressure-enthalpy curve of the refrigerant. The method including continuously operating the compressor when a segment of the process cycle corresponds to the refrigerant being in the liquid phase.

CHILLER APPARATUS FOR PLASMA TREATMENT DEVICE

In the present chiller apparatus, a refrigerant flow path is branchably attached to a lower electrode serving as a large sample table, which copes with a case where the surface area of a sample is large in a configuration in which a plasma treatment device connected to a refrigerant cycle equipped with a heating device is applied. A control device transmits a heating adjustment control signal generated based on a result of a PID arithmetic operation including proportion, integration, and differentiation on a lower electrode refrigerant pipe refrigerant detection temperature detected from a temperature sensor provided in the vicinity of a refrigerant flow path of a heat insulating portion relative to the lower electrode of a lower electrode refrigerant pipe connected to be linked to the refrigerant cycle to a heating device and performs feedback control such that the lower electrode refrigerant pipe refrigerant detection temperature becomes a setting temperature. 1. A chiller apparatus for a plasma treatment device , sharing an evaporator as a heat exchanger between a refrigerating cycle for cooling and a refrigerant cycle including a heating device for heating , having a function of controlling a rotational speed of an electric compressor of the corresponding refrigerating cycle , a refrigerant flow rate by a pump linked to a refrigerant tank in the corresponding refrigerant cycle , and a heating temperature of the corresponding heating device by a control device according to a temperature difference between a setting temperature set by a user and a work temperature of a work connected to the corresponding refrigerant cycle to heat-insulate the work , and applying the plasma treatment device which performs plasma treatment to the corresponding work to etch a sample to be a target ,wherein the plasma treatment device is equipped within a vacuum chamber with a lower electrode which places the corresponding sample thereon, serving as a large-size sample table coping ...

VAPOR CYCLE COOLING SYSTEM FOR HIGH POWERED DEVICES

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

DEVICE AND PROCESS FOR REFUELING CONTAINERS WITH PRESSURIZED GAS

A device and process for refuelling containers with pressurized gas comprising a pressurized gas source, a transfer circuit intended to be removably connected to a container, the device comprising a refrigeration system for cooling the gas flowing from the gas source prior to its entering into the container and comprising a refrigerant cooling loop circuit comprising, arranged in series, a compressor, a condenser section, an expansion valve and an evaporator section, the refrigeration system comprising a cold source in heat exchange with the condenser section and a heat exchanger located in the transfer circuit and comprising a heat exchange section between the gas flowing in the transfer circuit and the evaporator section, the device comprising an electronic controller configured to switch the refrigeration system in first standby mode when the device is not refuelling a container wherein the compressor is switched off when the temperature of the heat exchanger is equal or below a predefined first standby temperature threshold and for started and operated for producing cooling power and cooling the heat exchanger when the sensed temperature of the heat exchanger is above a second standby threshold temperature. 1. A device for refuelling containers with pressurized gas , notably for refuelling gaseous hydrogen tanks , comprising a pressurized gas source , a transfer circuit comprising one upstream end connected to the gas source and at least one downstream end intended to be removably connected to a container , the device comprising a refrigeration system for cooling the gas flowing from the gas source prior to its entering into the container , the refrigeration system comprising a refrigerant cooling loop circuit comprising , arranged in series , a compressor , a condenser section , an expansion valve and an evaporator section , the refrigeration system comprising a cold source in heat exchange with the condenser section and a heat exchanger located in the transfer ...

Control method of multi-split air conditioner, system, and computer readable storage medium

A method for controlling a multi-split air conditioner. The method comprises: detecting whether the degree of superheat of an outdoor unit meets a target requirement, if yes, determining whether a difference value between an average exhaust temperature of the outdoor unit and the average exhaust temperature of an outdoor unit system reaches a preset value, if yes, comparing the average exhaust temperature of the outdoor unit with the average exhaust temperature of the outdoor unit system, reducing operating frequency of a compressor of the outdoor unit if the average exhaust temperature of the outdoor unit is greater than the average exhaust temperature of the outdoor unit system; and increasing the operating frequency of the compressor of the outdoor unit if the average exhaust temperature of the outdoor unit is less than the average exhaust temperature of the outdoor unit 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 ...

METHOD FOR OPERATING A CHILLER

A method of operating a chiller having a closed refrigerant loop including a compressor, a condenser and an evaporator. The refrigerant used in the loop defining a pressure-enthalpy curve representative of different phases (vapor, liquid and vapor, and liquid) of the refrigerant at different combinations of pressure and enthalpy. The loop defining a process cycle (compression, condensation, expansion, and evaporation) of the refrigerant during operation of the loop relative to the pressure-enthalpy curve of the refrigerant. The method including continuously operating the compressor when a segment of the process cycle corresponds to the refrigerant being in the liquid phase. 1. A chiller system , comprising:a compressor configured to circulate a refrigerant through a refrigerant circuit;a condenser configured to place the refrigerant in thermal communication with a cooling fluid;an evaporator configured to place the refrigerant in thermal communication with a working fluid;a first sensor configured to provide first feedback indicative of a first temperature of the cooling fluid entering the condenser;a second sensor configured to provide second feedback indicative of a second temperature of the working fluid exiting the evaporator; anda controller communicatively coupled to the first sensor and the second sensor, wherein the controller is configured to compare the first feedback to the second feedback, to continuously operate the compressor in response to the first feedback being greater than the second feedback by a predetermined amount, to continuously operate the compressor in response to the first feedback and the second feedback being substantially equal to one another, and to operate the compressor at a minimum speed during free-cooling conditions defined by the second feedback being greater than the first feedback.2. The chiller system of claim 1 , wherein the controller is configured to continuously operate the compressor in response to the second feedback ...

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.

AIR CONDITIONING SYSTEM

An air conditioning system according to the present invention changes a target supply temperature based on a magnitude relationship between an operating frequency of a first compressor and a first frequency at which an operating efficiency of the first compressor reaches a maximum, and a magnitude relationship between an operating frequency of a second compressor and a second frequency at which an operating efficiency of the second compressor reaches a maximum. 1. An air conditioning system , comprising:a first refrigerant circuit in which a first compressor and an indoor heat exchanger are included, and through which refrigerant circulates;an indoor unit configured to cause indoor air in an indoor space to pass through the indoor heat exchanger, and provide the indoor air to the indoor space;a first frequency control unit configured to control an operating frequency of the first compressor so that a temperature of the indoor air becomes a target indoor temperature;a second refrigerant circuit in which a second compressor and a heat exchanger for ventilation are included, and through which refrigerant circulates;a ventilating device configured to introduce outdoor air from an outdoor space, cause the outdoor air to pass through the heat exchanger for ventilation, and provide supply air to the indoor space;a second frequency control unit configured to control an operating frequency of the second compressor so that a temperature of the supply air becomes a target supply temperature; anda set value control unit configured to change a set value of the target supply temperature based on the operating frequency of the first compressor and the operating frequency of the second compressor.2. The air conditioning system of claim 1 , whereinthe set value control unit is configured to change the target supply temperature based ona magnitude relationship between the operating frequency of the first compressor and a first frequency at which an operating efficiency of the first ...

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 ...

MULTI-AIR CONDITIONER FOR HEATING AND COOLING AND METHOD FOR CONTROLLING MULTI-AIR CONDITIONER FOR HEATING AND COOLING

A multi-air conditioner for heating and cooling may include at least one indoor unit installed in an indoor space and comprising an indoor heat exchanger and an indoor expansion valve; an outdoor unit connected to the at least one indoor unit via a refrigerant pipeline and comprising an outdoor heat exchanger, a compressor, an outdoor expansion valve, and a four-way valve; and at least one leak shut-off valve provided on the refrigerant pipeline, that blocks a flow of refrigerant in the refrigerant pipeline when a refrigerant leak from the refrigerant pipeline occurs in the indoor space. The outdoor unit may decrease a pressure of the refrigerant pipeline when a refrigerant leak occurs from the refrigerant pipeline. Therefore, it is possible to minimize an amount of refrigerant leakage when there is a refrigerant leak in the indoor space. 1. A multi-air conditioner for heating and cooling , comprising:at least one indoor unit installed in an indoor space and comprising an indoor heat exchanger and an indoor expansion valve;an outdoor unit connected to the at least one indoor unit via a refrigerant pipeline and comprising at least one outdoor heat exchanger, at least one compressor, at least one outdoor expansion valve, and at least one four-way valve; andat least one leak shut-off valve provided on the refrigerant pipeline, that blocks a flow of refrigerant in the refrigerant pipeline when a refrigerant leak from the refrigerant pipeline occurs in the indoor space, wherein the outdoor unit decreases a pressure of the refrigerant pipeline when the refrigerant leak occurs from the refrigerant pipeline.2. The multi-air conditioner for heating and cooling of claim 1 , wherein the at least one leak shut-off valve is installed outside of the indoor space in which the indoor unit is installed.3. The multi-air conditioner for heating and cooling of claim 2 , wherein the outdoor unit comprises:a subcooling unit that cools the refrigerant from the at least one outdoor heat ...

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

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

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 ...

Vehicular temperature regulation device

A vehicular temperature regulation device includes a refrigeration cycle, a high-temperature cycle, and a low-temperature cycle. The refrigeration cycle includes a heating heat exchanger configured to heat the heat medium in the high-temperature cycle by exchanging heat between the refrigerant and the heat medium, and a cooling heat exchanger configured to cool the heat medium in the low-temperature cycle by exchanging heat between the refrigerant and the heat medium. The vehicular temperature regulation device includes a connection portion that connects the high-temperature cycle and the low-temperature cycle, a regulation portion configured to regulate a flow of the heat medium, and a controller. After the controller stops the compressor, or after the controller receives a stop command of stopping the compressor, the controller controls the regulation portion, a first pump, and a second pump to exchange the heat medium between the high-temperature cycle and the low-temperature cycle.

System and method for controlling air conditioning system

An air conditioning system for an operator cab of machine includes a condenser, an evaporator, a compressor and a controller operable to control an operation of the compressor. The controller maintains a pre-defined compressor run time when the compressor is in an ON state. The controller is configured to determine a temperature of the evaporator and compare it with at least one of a first lower threshold temperature value and a second lower threshold temperature value being less than the first lower threshold temperature value. The controller outputs a compressor control command signal to change the operational state of the compressor to an OFF state when the determined temperature of the evaporator is less than at least one of the first lower threshold temperature value for a first time period, and the second lower threshold temperature value for a second time period being less than the first time period.

Air conditioner

A notifier notifies a user of a warning when a ratio of first refrigerant is different from a suitable value, the ratio being determined from a first difference between a first temperature and a second temperature and from a second difference between a third temperature and a fourth temperature. The first temperature is a temperature of non-azeotropic refrigerant mixture between first heat exchanger and a second heat exchanger. The second temperature is a temperature of the non-azeotropic refrigerant mixture between the second heat exchanger and first expansion valve. The third temperature is a temperature of the non-azeotropic refrigerant mixture between a first decompressor and first connecting point. The fourth temperature is a temperature of the non-azeotropic refrigerant mixture between a second decompressor and the first connecting point.

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 ...

Controlling Air Conditioner Modes

In various implementations, a request for operation of an air conditioner may be received. The air conditioner may include a cooling mode and/or a dehumidifying mode. In some implementations, a compressor speed for a compressor of the air conditioner may be determined, and which mode(s) of the air conditioner to allow may be determined based at least partially on the determined compressor speed. 1. A method of controlling an air conditioner , the method comprising:receiving a request for operation of the air conditioner;determining a compressor speed for a compressor of the air conditioner; and allowing a cooling mode if the compressor speed is greater than a predetermined first speed;', 'allowing the cooling mode and a dehumidifying mode if the compressor speed is less than the predetermined first speed and if the compressor speed is greater than a predetermined second speed; and', 'allowing only the dehumidifying mode if the compressor speed is less than the predetermined second speed., 'determining a mode of the air conditioner to allow, wherein determining a mode to allow comprises2. The method of further comprising:monitoring temperature or relative humidity proximate the air conditioner; andwherein determining a compressor speed comprises utilizing the monitored temperature or relative humidity to determine the air conditioner's compressor speed.3. The method of wherein the request for operation includes a set point temperature claim 1 , and wherein the compressor speed is less than the predetermined second speed claim 1 , and further comprising reducing the set point temperature if an overcool mode selection has been received.4. The method of wherein reducing the set point temperature comprises reducing the set point temperature by approximately two degrees Fahrenheit.5. The method of wherein the request for operation comprises a set point temperature claim 1 , and wherein the predetermined relative humidity value comprises approximately 60% relative humidity ...

AIR-CONDITIONING APPARATUS AND AIR-CONDITIONING SYSTEM

A refrigerant circuit forming a refrigeration cycle by connecting together a compressor, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger via a refrigerant pipe; and a control unit controlling a blown-out air temperature by causing the indoor heat exchanger to exchange heat while controlling the refrigeration cycle based on one of a sensible heat capability and a latent heat capability calculated from a cooling capability of the refrigerant circuit and a cooling load of the refrigerant circuit. The control unit includes: a capability judging unit judging the cooling capability of the refrigerant circuit based on the one of the sensible heat capability and the latent heat capability; and a control selecting unit selecting one from between superheat degree control to control a degree of superheat and evaporating temperature control to control an evaporating temperature, based on a determination result obtained by the capability judging unit. 1. An air-conditioning apparatus comprising:a refrigerant circuit forming a refrigeration cycle by connecting together a compressor, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger via a refrigerant pipe; anda control unit configured to control a blown-out air temperature by causing the indoor heat exchanger to perform a heat exchanging process while controlling the refrigeration cycle based on a cooling load, and one of a sensible heat capability and a latent heat capability calculated from a cooling capability of the refrigerant circuit, wherein a capability judging unit configured to judge the cooling capability of the refrigerant circuit based on the one of the sensible heat capability and the latent heat capability; and', 'a control selecting unit configured to select one from between superheat degree control to control a degree of superheat and evaporating temperature control to control an evaporating temperature, based on a determination result obtained by the ...

SYSTEM FOR MANAGING LUBRICANT LEVELS IN TANDEM COMPRESSOR ASSEMBLIES OF AN HVAC SYSTEM

The present invention provides a control system for managing lubricant levels in tandem compressor assemblies of a heating, ventilation, and air conditioning (HVAC) system. In transitioning from a partial load that operates a first compressor but not a second compressor of a tandem assembly to a full load that operates both the first and the second compressor, a controller of the HVAC system turns OFF both compressors of the tandem compressor assembly to allow time for lubricant levels to equalize between the first and the second compressor. 1. A control system for a heating , ventilation , and air conditioning (HVAC) system , the control system comprising:a control assembly configured to operationally connect to an HVAC compressor assembly of an HVAC system for controlling the environment in an enclosed space;wherein the HVAC compressor assembly is configured for operation by the controller to deliver a load capacity in one or more demand stages, wherein the controller operates the HVAC compressor assembly in at least a lower demand stage and a higher demand stage, wherein the HVAC compressor assembly delivers a larger capacity at the higher demand stage than at the lower demand stage;wherein the HVAC compressor assembly is configured for operation by the control assembly in one or more modes of operation based on an ambient temperature outside the enclosed space;wherein the control assembly comprises a controller configured to control operation of a first compressor assembly and a second compressor assembly of the HVAC compressor assembly;wherein the first compressor assembly comprises a first tandem compressor assembly having a first compressor and a second compressor operationally connected for tandem operation as part of a first circuit having first heat transfer devices;wherein the second compressor assembly comprises at least a third compressor comprising a part of a second circuit having second heat transfer devices separated from the first heat transfer ...

Compressor Protection and Grid Fault Detection Device

A method of operating a refrigeration system that receives power from an electrical grid includes selectively operating at least one component of the refrigeration system in a first state. The method includes selectively detecting a fault event of the electrical grid in response to a concurrent (i) increase in amount of current drawn by the component and (ii) decrease in voltage of power received by the component. The method includes, in response to detecting the fault event, switching the component from the first state to a second state. The component consumes less power in the second state than in the first state. The method includes determining a first delay period. The method includes identifying a conclusion of the fault event. The method includes, in response to the conclusion of the fault event, waiting for the first delay period before switching the component back to the first state. 1. (canceled)2. A method of operating a refrigeration system that receives power from an electrical grid , the method comprising:selectively operating at least one component of the refrigeration system in a first state;selectively detecting a fault event of the electrical grid in response to a concurrent (i) increase in amount of current drawn by the at least one component and (ii) decrease in voltage of power received by the at least one component;in response to detecting the fault event, switching the at least one component from the first state to a second state, wherein the at least one component consumes less power in the second state than in the first state;determining a first delay period;identifying a conclusion of the fault event; andin response to the conclusion of the fault event, waiting for the first delay period before switching the at least one component back to the first state.3. The method of claim 2 , wherein the first delay period is determined based on a lowest value of the voltage during a period between detecting the fault event and identifying the ...

Portable heating system and method for pest control

A method for killing pests in an affected area of a structure, comprises positioning a heat pump unit within an affected area of the structure, coupling a first end of an inlet hose to a faucet, and coupling a second end of the inlet hose to an inlet port of the heat pump unit. The inlet port supplies a flow of water received from the faucet to an evaporator component of the heat pump unit. The evaporator component transfers heat from the flow of water to a refrigerant and communicate the refrigerant to a condenser component of the heat pump unit. The condenser component generates heated air by transferring heat from the refrigerant fluid to air flowing through the condenser component. The heated air i emitted into the affected area in order to raise the temperature of the affected area to a target temperature greater than 120 degrees Fahrenheit.

SUPERHEAT AND SUB-COOLING CONTROL OF REFRIGERATION SYSTEM

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

Variable Speed Compressor Startup Control

A drive controller for a motor of a compressor includes a drive circuit that applies voltages to windings of the motor. The drive controller includes a speed control module that controls the drive circuit to rotate the motor at a requested speed. The drive controller includes a speed determination module that generates the requested speed. The drive controller includes a locked rotor protection module that identifies a locked rotor condition and, in response to identifying the locked rotor condition, instructs the speed determination module to power down the motor. The locked rotor protection module acquires an estimated speed of the motor upon expiration of a predetermined time interval that begins upon startup of the motor. The locked rotor protection module identifies the locked rotor condition in response to the estimated speed being lower than a threshold speed. The threshold speed is based on the requested speed.

REFRIGERATION CYCLE APPARATUS

A refrigeration cycle apparatus includes a refrigerant circuit including a compressor, a condenser (outdoor heat exchanger), an expansion valve, and an evaporator (indoor heat exchanger), a fan configured to blow air to the condenser, a fan configured to blow air to the evaporator, and a controller configured to control at least one of a frequency of the compressor, an opening degree of the expansion valve, a rotation speed of the fan, and a rotation speed of the fan, such that the refrigerant sucked into the compressor has a quality of 1.0 or greater. The refrigerant circuit is configured for use with a refrigerant mixture inclusive of 30 wt % to 50% wt ethylene-based hydrofluorocarbon refrigerant. 1. (canceled)2. A refrigeration cycle apparatus comprising:a refrigerant circuit including a compressor, a condenser, a pressure reducing device, and an evaporator;a first fan configured to blow air to the condenser;a second fan configured to blow air to the evaporator;an outdoor air temperature detecting unit configured to detect an outdoor air temperature; anda controller configured to control at least one of a frequency of the compressor, an opening degree of the pressure reducing device, a rotation speed of the first fan, and a rotation speed of the second fan, such that the refrigerant sucked into the compressor has a suction superheat degree, which is a degree of superheat of the refrigerant sucked into the compressor, the suction superheat degree being lower than or equal to a difference between the outdoor air temperature detected by the outdoor air temperature detecting unit and a saturated gas temperature of the refrigerant,wherein the refrigerant circuit is configured for use with a refrigerant mixture inclusive of 30 wt % to 70 wt % ethylene-based hydrofluorocarbon refrigerant.3. The refrigeration cycle apparatus of claim 2 , wherein the controller is configured to perform control such that a discharge temperature of the compressor lies within a predetermined ...

ROBUST FIXED-SEQUENCE CONTROL METHOD AND APPLIANCE FOR EXCEPTIONAL TEMPERATURE STABILITY

A method to control a fixed-sequence dual evaporator cooling system including providing a recurring cooling cycle cooling system wherein each recurring cooling cycle comprises first and second cooling cycles for cooling respective first and second interiors, a pump-out cycle for returning coolant to a condenser, and an idle cycle, and providing a processor to establish exceptions to the recurring cooling cycle. A step includes the processor monitoring first and second actual temperatures of the respective first and second interiors, selecting predetermined first and second control temperatures for the respective first and second interiors, and selecting a command input signal to supply to a compressor, the condenser fan, the first and second evaporator fans, and the valve of the cooling system during the recurring cooling cycle based upon the first and second actual temperatures and the predetermined first and second control temperatures to initiate the established exceptions. 1. A method for fixed-sequence control of a dual evaporator cooling system comprising the steps of:operating a cooling system in a recurring fixed-sequence cooling cycle wherein each recurring fixed-sequence cooling cycle includes at least a first cooling cycle for cooling a first interior and a second cooling cycle for cooling a second interior;establishing exceptions to the recurring fixed-sequence cooling cycle, wherein a processor establishes the exceptions;monitoring first and second actual temperatures of the first and second interiors, respectively;selecting predetermined first and second control temperatures for the first and second interiors, respectively; andselecting a command input signal to supply to the cooling system during the recurring fixed-sequence cooling cycle based upon the first and second actual temperatures and the predetermined first and second control temperatures to initiate the established exceptions.2. The method of claim 1 , further comprising the step of: ...

Thermoelectric heat exchanger for an hvac system

The present disclosure relates to a heating, ventilation, and/or air conditioning (HVAC) system having a heat exchanger configured to thermally regulate a supply air flow, where the heat exchanger includes a thermoelectric device, a first plurality of fins coupled to the thermoelectric device, and a second plurality of fins coupled to the thermoelectric device. The first plurality of fins extend into a supply air flow path of the supply air flow to transfer thermal energy between the thermoelectric device and the supply air flow and the second plurality of fins convectively transfer thermal energy between the thermoelectric device and a working fluid exterior the supply air flow path.

Portable heating system and method for pest control

A system for killing pests in an affected area of a structure comprises a heat pump unit placed within an affected area. The heat pump unit comprises an evaporator component, a condensor component, and a compressor component. The evaporator component is configured to receive a flow of water from a faucet, and transfer heat from the flow of water to a refrigerant. The condenser component is configured to receive the refrigerant from the evaporator component, and generate heated air by transferring heat from the refrigerant to air flowing through the condenser component. The heated air being emitted into the affected area is in order to raise the temperature of the affected area to a target temperature greater than 120 degrees Fahrenheit. The compressor component is configured to return the refrigerant from the evaporator component of the heat pump unit to the condenser component of the heat pump unit.

Control System For Multiple Compressors

A control system for controlling an output for a plurality of compressors includes a control unit receiving a first value from a first sensor and generating a first output based on the first value. The control unit receives a second value from a second sensor and derives a final output from the first output and the second value. A plurality of compressors receives the control commands from the control unit based on the final output.

Air-conditioning apparatus

An air-conditioning apparatus includes a refrigeration cycle in which a compressor, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger are connected in a circuit and is provided with an indoor air temperature sensor configured to detect indoor air temperature in a space in which the air-conditioning apparatus is installed, and a controller configured to control a rotation speed of the compressor. The controller controls operation of the compressor based on an operation state of the compressor and a change amount of the indoor air temperature detected by the indoor air temperature sensor at a set time interval.

REFRIGERATION CYCLE APPARATUS

A refrigeration cycle apparatus includes a refrigerant circuit, a controller, a bypass pipe, a refrigerant cooler, a second expansion device, and a controller temperature sensor. In a case where a temperature measured by the controller temperature sensor is lower than or equal to a set temperature in a state where an opening degree of the second expansion device is controlled to an instruction opening degree that is lower than or equal to a set opening degree, the controller is configured to perform foreign substance release control where the controller is configured to increase the opening degree of the second expansion device and then is configured to return the opening degree of the second expansion device to the instruction opening degree. 1. A refrigeration cycle apparatus , comprising:a refrigerant circuit through which refrigerant circulates, the refrigerant circuit including a compressor, a heat-source-side heat exchanger, a first expansion device, and a load-side heat exchanger;a bypass pipe branched from a pipe between the compressor and the first expansion device, and connected to a pipe connected to a suction port of the compressor;a second expansion device provided in the bypass pipe, the second expansion device being configured to regulate a flow rate of the refrigerant flowing through the bypass pipe;a refrigerant cooler through which the refrigerant flows, the refrigerant cooler being provided in the bypass pipe;a controller configured to control the compressor, the first expansion device, and the second expansion device, the controller being cooled by the refrigerant cooler; anda controller temperature sensor configured to measure a temperature of the controller,in a case where a temperature measured by the controller temperature sensor is lower than or equal to a set temperature in a state where an opening degree of the second expansion device is controlled to an instruction opening degree that is lower than or equal to a set opening degree, the ...

METHOD FOR CONTROLLING THE SPEED OF A MOTOR

Method for controlling the speed of rotation of an electric motor by means of a variable speed drive supplied with power by a mains electrical power supply, in which method in a variable speed mode of operation the motor is supplied with power by the variable speed drive and in a fixed speed mode of operation the motor is supplied with power directly by the mains supply, and in which method before the changeover from the supply of power by the variable speed drive to the direct supply of power by the mains supply, the motor is first accelerated by the variable speed drive, the variable speed drive operating beyond its nominal current during the acceleration preceding the changeover. 143-. (canceled)44. A method of controlling a speed of rotation of an electric motor , the method comprising:supplying the electric motor with a first power from a variable speed drive when operating in a variable speed mode of operation, the variable speed drive powered by an alternating current electric power supply;using the variable speed drive to accelerate the electric motor during a transition phase to a fixed speed mode of operation, the variable speed drive operating beyond a nominal current during the transition phase; andsupplying the electric motor with a second power directly from the alternating current electric power supply when operating in the fixed speed mode of operation.45. The method according to claim 44 , in which claim 44 , in the variable speed mode of operation claim 44 , the variable speed drive is in a star configuration claim 44 , and claim 44 , in the fixed speed mode of operation claim 44 , the alternating current electric power supply is in a triangle configuration.46. The method according to claim 44 , wherein the transition phase is effected automatically when a setpoint value of a control parameter crosses a given threshold.47. The method according to claim 46 , wherein the control parameter is one of a torque or a parameter representative of the first ...

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.

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 ...

INSULATED ICE COMPARTMENT FOR BOTTOM MOUNT REFRIGERATOR WITH CONTROLLED DAMPER

A refrigerator includes a refrigerator cabinet, a fresh food compartment disposed within the cabinet, a freezer compartment disposed within the cabinet, an ice compartment disposed within the cabinet, and an electronic control system associated with the refrigerator and adapted to monitor and control the fresh food compartment, the freezer compartment and the ice compartment. The control system provides for energy efficient control and operation through various means, including by monitoring state of an ice maker associated with the ice compartment and controlling temperature within compartments of the refrigerator based on the ice maker state. A damper controls air flow between the fresh food and freezer compartments. The control system can direct heat to the damper if the damper becomes frozen. 1. An appliance , comprising:a fresh food section having a fresh food section door;a freezer section having a freezer section door;an electronic control system electrically connected to a defrost heater, a compressor, a damper, a variable speed evaporator fan;an ice compartment assembly having a front plate and an insulated front cover, the insulated front cover having an insulated material between a front cover inner panel and a front cover outer panel, wherein the front cover inner panel mounts to the front plate, and wherein the insulated front cover has an opening that mates with a chute and the chute is adapted to engage with an opening in the fresh food section door or the freezer section door;wherein the electronic control system receives information from a defrost heater input, a compressor input, a damper input, and a variable speed evaporator input; andwherein the electronic control system is adapted to control temperature the fresh food section and the freezer section based on information received from the defrost heater input, the compressor input, the damper input, and the variable speed evaporator input.2. The appliance of claim 1 , further comprising a damper ...

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 ...

DOMESTIC REFRIGERATION APPLIANCE WITH A COOLANT CIRCUIT AND METHOD FOR OPERATING A DOMESTIC REFRIGERATION APPLIANCE WITH A COOLANT CIRCUIT

A domestic refrigeration appliance has a heat-insulated housing with a coolable inner container delimiting a coolable interior for storing foods. The interior is cooled with a coolant circuit that includes a compressor with a three-phase motor operated by an actuator via electrically powered motor windings. The actuator is actuated at least indirectly to operate the compressor in a switched-on state with a rotational speed of the three-phase motor at least approximately equal to a predetermined rotational speed. The actuator is caused to switch off the compressor such that the rotational speed of the three-phase motor decreases to a predetermined minimum rotational speed, and thereafter to switch off the three-phase motor for at least a predetermined period of time by de-energizing the motor windings. The period of time is selected long enough to reduce the speed of the motor, beginning from the minimum rotational speed, to reach standstill. 110- (canceled)11. A method of operating a domestic refrigeration appliance , the appliance having a heat-insulated housing with a coolable inner container , which delimits a coolable interior for storing foods , an actuator , and a coolant circuit with a compressor for cooling the coolable interior , the compressor having a three-phase motor with motor windings to be operated by the actuator by electrically powering the motor windings , the method comprising:operating the compressor in a switched-on state by operating the three-phase motor, activated by the actuator, substantially at a predetermined rotational speed;switching off the compressor from the switched-on state by:reducing the rotational speed of the three-phase motor, under control of the actuator, until the rotational speed reaches a predetermined minimum rotational speed; andsubsequently switching off the three-phase motor by de-energizing the motor windings for a predetermined period of time;thereby selecting the predetermined period of time to be long enough for ...

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 ...

METHOD OF CONTROLLING REFRIGERATOR

A refrigerator includes a temperature sensor provided in a storage space of the refrigerator to detect a temperature; an inverter compressor constituting a freezing cycle for cooling the storage space, the number of rotations being variable by frequency control; and a controller for controlling the operation of the inverter compressor. The controller may variably control the operating frequency of the inverter compressor according to the load of the storage space in order to maintain the storage space at a set temperature, and compare the operating frequency with a stop frequency when a stop signal is input, when the operating frequency is lower than the stop frequency, raise the frequency of the inverter compressor to the stop frequency, and then stop the inverter compressor. 1. A method of controlling a refrigerator comprising:performing a lubrication operation that includes operating a compressor at a first frequency after initiating the compressor;performing, after the lubrication operation, a load-response operation that includes determining a second frequency of the compressor according to a load of a storage space of the refrigerator, and operating the compressor at the second frequency; andperforming a stop operation that includes comparing the second frequency with a third frequency when a stop condition occurs, and then increasing a frequency of the compressor to the third frequency and then stopping the compressor when the second frequency is less than the third frequency.2. The method of claim 1 , wherein the third frequency is set to a value between 15% and 40% of a lower limit of an entire frequency range of the compressor.3. The method of claim 1 , wherein the third frequency is set to a value between 10 Hz and 20 Hz.4. The method of claim 1 , wherein the third frequency is set lower than the first frequency.5. The method of claim 1 , wherein the stop operation includes operating the compressor for a set time at the third frequency and then stopping ...

Control Circuit, Signal Conversion Circuit and Control Method

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

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 ...

METHOD AND APPARATUS FOR BALANCED FLUID DISTRIBUTION IN TANDEM-COMPRESSOR SYSTEMS

A compressor system includes a first compressor and a second compressor. A suction equalization line fluidly couples the first compressor and the second compressor. A first branch suction line is fluidly coupled to the first compressor and a second branch suction line is fluidly coupled to the second compressor. A main suction line is fluidly coupled to the first branch suction line and the second branch suction line. An obstruction device is disposed in at least one of the first branch suction line and the second branch suction line. Responsive to deactivation of at least one of the first compressor and the second compressor, the obstruction device is at least partially closed thereby causing prescribed liquid levels in the first compressor and the second compressor during partial-load operation. 1. A multiple compressor system comprising:a first compressor and a second compressor;a suction equalization line fluidly coupling the first compressor and the second compressor;a first branch suction line fluidly coupled to the first compressor;a second branch suction line fluidly coupled to the second compressor;a main suction line fluidly coupled to the first branch suction line and the second branch suction line;an obstruction device disposed in at least one of the first branch suction line and the second branch suction line flow path, wherein the obstruction device comprises a P-trap having a bypass flow path; andwherein the obstruction device is partially closed responsive to deactivation of at least one of the first compressor and the second compressor thereby restricting fluid flow into at least one of the first compressor and the second compressor that is deactivated.2. The multiple compressor system of claim 1 , wherein the restricting fluid flow causes accumulation of fluid in the P-trap resulting in reduction in pressure drop differential across the a first branch suction line and the a second branch suction line.3. The multiple compressor system of claim 1 , ...

DC TO DC CONVERTER SOURCING VARIABLE DC LINK VOLTAGE

An inverter-converter system includes a DC source, a DC to DC boost converter, a DC link capacitor, an inverter circuit, a variable speed electric machine, and a controller. The DC to DC boost converter receives an input DC voltage from the DC source. The inverter circuit converts the variable boosted voltage to an AC voltage to drive the variable speed electric machine. The controller senses a plurality of parameters from the variable speed electric machine, and controls the DC to DC boost converter to boost up the input DC voltage to a variable output voltage based on the plurality of parameters and/or the voltage (or load) needed by the variable speed electric machine. The design of the inverter-converter system can achieve an electrical efficiency and cost savings for the overall system. 114-. (canceled)15. A boost converter , comprising:a first boost circuit having a first switch configured to be connected to a first coil, the first coil having a first end and a second end; anda second boost circuit having a second switch configured to be connected to a second coil, the second coil having a first end and a second end,wherein the first boost circuit is configured to be connected to a power source to receive an input voltage and the first boost circuit connects to the second boost circuit;wherein the first switch is controlled to boost the input voltage to a first boosted voltage using the first coil without the second coil;wherein the second switch is controlled to boost the input voltage to a second boosted voltage using the first coil and the second coil;wherein the second boosted voltage is greater than the first boosted voltage, the first boosted voltage is greater than the input voltage; andwherein the first coil is configured to be connected to the second coil in series when the second switch is controlled to boost the input voltage to the second boosted voltage.16. The boost converter according to claim 15 , wherein the first switch and the second switch ...

Refrigerator

In a refrigerator including a sliding door configured to open and close a storage chamber, a storage basket provided on a rear portion of the sliding door, and a support frame configured to support the sliding door and the storage basket, sidewalls of the storage basket may be formed so as to protrude outwardly except a lower portion in which the support frame is disposed between an inner case and the sidewalls, thereby increasing a storage space of the storage basket. In addition, a front protrusion, an auxiliary protrusion, and a rear protrusion are formed in an upper portion of the storage basket, and therefore a relative position of an auxiliary basket to the storage basket may be limited, and the auxiliary basket may be drawn into and out in conjunction with drawn-in and-out movements of the storage basket.

INFORMATION PROCESSING APPARATUS, AIR-CONDITIONING APPARATUS, AND AIR-CONDITIONING SYSTEM

An information processing apparatus obtains a heat load equation for calculating a heat load corresponding to a time at which a predetermined time period has elapsed from a current point in time using learning data concerning a heat load influencing factor of an air-conditioning apparatus, estimates, in a case where a compressor continues performing a low load operation, in which operation is performed at a standard operating frequency or less, for a predetermined time period or more, whether the heat load will become higher than the current point in time after the predetermined time period has elapsed using the heat load equation obtained, outputs, when estimating that the heat load will not become higher, an oil return command signal commanding that an operating frequency be increased to the compressor, and does not output, when estimating that the heat load will become higher, the oil return command signal to the compressor. 1. An information processing apparatus comprising:a memory storing a program,a processor configured to execute a process according to the program, wherein the processor being configured toobtain a heat load equation for calculating a heat load corresponding to a time at which a predetermined time period has elapsed from a current point in time using learning data concerning a heat load influencing factor of an air-conditioning apparatus including a compressor;estimate, in a case where the compressor continues performing a low load operation, in which operation is performed at a standard operating frequency or less, for a predetermined time period or more, whether the heat load will become higher than that corresponding to the current point in time after the predetermined time period has elapsed using the heat load equation; andoutput, in a case where the estimation unit estimates that the heat load will not become higher, an oil return command signal commanding that an operating frequency be increased to the compressor, and not output, in a ...

Ice Machine Including Vapor-Compression System

A method may include selecting a first set of values for a first set of parameters of one or more hardware components of an ice-making machine; identifying a water temperature at a water inlet of the ice-making machine; identifying an ambient air temperature surrounding the ice-making machine; calculating a second set of parameters of the ice-making machine based on at least a portion of the first set of values, the water temperature and the ambient temperature, the second set of parameters corresponding to operation of the ice-making machine in a freeze mode in which liquid water is cooled by an evaporator; and calculating a third set of parameters based on at least a portion of the first set of values, the water temperature and the ambient temperature, the third set of parameters corresponding to operation of the ice-making machine in a harvest mode. 1. A method comprising:selecting a first set of values for a first set of parameters of one or more hardware components of an ice-making machine;identifying a water temperature at a water inlet of the ice-making machine;identifying an ambient air temperature surrounding the ice-making machine;calculating a second set of parameters of the ice-making machine based on at least a portion of the first set of values, the water temperature and the ambient temperature, the second set of parameters corresponding to operation of the ice-making machine in a freeze mode in which liquid water is cooled by an evaporator; andcalculating a third set of parameters of the ice-making machine based on at least a portion of the first set of values, the water temperature and the ambient temperature, the third set of parameters corresponding to operation of the ice-making machine in a harvest mode during which a predetermined amount of ice is melted until the ice is removed from the evaporator.2. The method of claim 1 , further comprising:selecting a second set of values for the first set of parameters of the one or more hardware components ...

AVOIDING COIL FREEZE IN HVAC SYSTEMS

An HVAC system includes an evaporator. The evaporator includes a sensor configured to measure a property value (i.e., a saturated suction temperature or a saturated suction pressure) associated with saturated refrigerant flowing through the evaporator. The system includes a variable-speed compressor configured to receive the refrigerant and compress the received refrigerant. The system includes a controller communicatively coupled to the sensor and the variable-speed compressor. The controller monitors the property value measured by the sensor and detects a system fault, based on the monitored property value. In response to detecting the system fault, the controller operates the compressor in a freeze-prevention mode, which is configured to maintain the property value above a setpoint value by adjusting a speed of the variable-speed compressor. This prevents or delays freezing of the evaporator during operation of the system during the detected system fault. 1. A heating , ventilation , and air conditioning (HVAC) system , the HVAC system comprising:an evaporator configured to receive a refrigerant and transfer heat from a flow of air to the refrigerant, the evaporator comprising a sensor configured to measure a property value associated with saturated refrigerant flowing through the evaporator, wherein the property value is one of a saturated suction temperature and a saturated suction pressure;a variable-speed compressor configured to receive the refrigerant and compress the received refrigerant; monitor the property value measured by the sensor;', 'detect a system fault, based on the monitored property value; and', 'in response to detecting the system fault, operate the variable-speed compressor in a freeze-prevention mode, the freeze-prevention mode configured to maintain the monitored property value above a setpoint value by adjusting a speed of the variable-speed compressor, thereby delaying freezing of the evaporator during operation of the HVAC system during ...

System and method for controlling a system that includes variable speed compressor

A system and method for controlling a system that includes a variable speed compressor are described. The method can provide improved accuracy in the control of a system, for example, a heating, ventilating, and air condition (HVAC) system that includes a variable speed compressor, and can reduce a compressor cycling frequency of the compressor when a required capacity is below a minimum capacity of the compressor.

COOLING EQUIPMENT, TEMPERATURE CONTROL SYSTEM, AIR CONDITIONING SYSTEM, AND HOT WATER SUPPLY SYSTEM FOR THE SAME

The present invention aims to provide cooling equipment which can reduce power consumption. Cooling equipment includes a storage chamber that stores storage goods; latent heat storage materials to disposed inside the storage chamber a compressor that configures a refrigerating cycle for cooling the inside of the storage chamber a temperature sensor that detects a temperature of the latent heat storage materials to and a control unit that controls the compressor based on a state of the latent heat storage materials to 1. (canceled)2. Cooling equipment comprising:a storage chamber that stores storage goods;a first latent heat storage member that is disposed inside the storage chamber and includes at least a first latent heat storage material which is reversibly phase-transited between a solid phase and a liquid phase;a second latent heat storage member that is disposed inside the storage chamber and includes at least a second latent heat storage material which is reversibly phase-transited between the solid phase and the liquid phase;a sensor that detects a state of the second latent heat storage member;a cooling mechanism that cools the inside of the storage chamber; andcontrol circuitry that controls the cooling mechanism, based on the state of the second latent heat storage member; whereinthe second latent heat storage member is phase-transited earlier than the first latent heat storage member;a thickness of the second latent heat storage member is thinner than a thickness of the first latent heat storage member;the first latent heat storage member has a substantially constant uniform thickness and the second latent heat storage member has a substantially constant uniform thickness; andthe second latent heat storage material is at a position where cold air blowing into the storage chamber hits positions adjacent to and at a corner inside the storage chamber.3. The cooling equipment according to claim 2 , whereinthe first latent heat storage member functions as a ...

Refrigeration device and cold water temperature control method for same

Provided are a refrigeration device and a cold water temperature control method for same. The control method comprises the following steps: controlling a refrigeration device to enter a heat preservation state (S1); detecting a water temperature in a water tank (10) in the refrigeration device (S2); and if the water temperature is greater than a first pre-set temperature, controlling the refrigeration device to carry out a refrigeration operation for a pre-set time so that the water temperature is less than a second pre-set temperature, and controlling the refrigeration device to stop the refrigeration operation after the pre-set time (S3), wherein the second pre-set temperature is less than or equal to the first pre-set temperature. The water temperature control is realized by means of a pre-set time, so that the temperature of cold water can be more precisely controlled.

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. 16-. (canceled)7. 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 the compressor rack power consumption data and the condensing unit power consumption data, determines a total power consumption of the refrigeration or HVAC system based on the compressor rack power consumption data and the condensing unit ...

Unit cooler with staggered defrost on a plurality of evaporator coils

An HVAC system includes a unit cooler, which includes a first evaporator coil, a second evaporator coil, and a blower. The HVAC system further includes a first sensor, a second sensor, a first valve, a second valve, and a controller. The controller actuates the blower to direct air to flow over the first evaporator coil and the second evaporator coil, receives measurements from the first sensor and the second sensor, initiates a defrost cycle for the first evaporator coil by transmitting instructions to close the first valve to prevent the flow of refrigerant into the first evaporator coil, transmits instructions to open the first valve when the defrost cycle for the first evaporator coil has terminated, and initiates a defrost cycle for the second evaporator coil by transmitting instructions to close the second valve to prevent the flow of refrigerant into the second evaporator coil.