Abstract: A cooling system and method are provided for facilitating two-phase heat transfer from an electronics system including a plurality of electronic devices to be cooled. The cooling system includes a plurality of evaporators coupled to the electronic devices, and a coolant loop for passing system coolant through the evaporators. The coolant loop includes a plurality of coolant branches coupled in parallel, with each coolant branch being coupled in fluid communication with a respective evaporator. The cooling system further includes a control unit for maintaining pressure of system coolant at a system coolant supply side of the coolant branches within a specific pressure range at or above saturation pressure of the system coolant for a given desired saturation temperature of system coolant into the evaporators to facilitate two-phase heat transfer in the plurality of evaporators from the electronic devices to the system coolant at the given desired saturation temperature.

Abstract: A method for controlling a refrigeration system with a variable compressor capacity, and at least two refrigeration entities, e.g. display cases, includes controlling suction pressure by either permitting or preventing the flow of refrigerant into the evaporators of one or more refrigeration entities. The method also includes controlling compressor capacity based on a signal derived from one or more properties of the one or more refrigeration entities, said signal reflecting a possible difference between the current compressor capacity and a current refrigeration demand of the refrigeration system. The method reduces wear on compressors by avoiding switching them ON or OFF to the largest extent possible, and also prevents problems relating to conflicting control strategies due to control parameters, e.g. suction pressure, being determined based on two or more controllable parts, e.g. compressors and flow of refrigerant into refrigeration entities.

Abstract: Out of switching mechanisms (30A, 30B), the switching mechanism (30A) connected to an indoor heat exchanger (41) performing a heating operation is configured so that the opening of a supercooling control valve (53) is adjusted according to the air conditioning load of another indoor heat exchanger (41) performing a cooling operation downstream of a liquid connection pipe (13) connected to the former indoor heat exchanger (41).

Abstract: An air conditioner and a method of controlling the same are provided. The air conditioner may include an outdoor unit, one or more indoor units operably coupled to the outdoor unit, a temperature sensor, a valve driver, and a controller. By monitoring an actual temperature and comparing the actual temperature to a desired temperature, a flow path, of flow direction, and flow capacity flowing to the one or more indoor units to adjust a heating/cooling capacity thereof as appropriate.

Abstract: A refrigerator control method is disclosed which ensures efficient operation of a compressor. To control a refrigerator including a compressor, a first evaporator and a second evaporator connected to the compressor, and a refrigerant control valve that controls introduction of a refrigerant into the first evaporator and the second evaporator, the refrigerator control method includes operating the compressor, and controlling the opening and closing of the refrigerant control valve, to reduce not only consumption of electricity by the compressor, but also a pressure difference between an entrance and an exit of the compressor upon starting of the compressor.

Abstract: A modular evaporator which can be assembled from a number of standard modules is provided. Depending on the requirements, the modular evaporator can be assembled to meet a wide range of design cooling loads. Additionally, the modular evaporator is capable of generating and holding ice for thermal storage purposes, eliminating the need for external ice storage tanks. Furthermore, the heat transfer and thermal storage fluid for the evaporator can simply be water which considerably simplifies the system, lowers the cost, and increases the efficiency of the heat transfer loop.

Abstract: The present invention relates to a refrigerant valve control device and a control method thereof, which adjusts eccentricity of a refrigerant valve during an operation of a refrigerator to prevent overcooling. A refrigerant valve control device of a refrigerator includes a temperature sensing part that senses temperature inside the refrigerator; a refrigerant valve that selectively opens and closes a refrigerant path; and a controlling part that controls the refrigerant valve based on temperature differences between the sensed temperature inside the refrigerator and a predetermined control temperature. In another aspect of the present invention, a control method of a refrigerant valve for a refrigerator includes determining whether refrigerant is leaked at a refrigerant valve based on temperature differences between the temperature inside the refrigerator and a predetermined control temperature; and controlling the refrigerant valve based on the result of the determination.

Abstract: A heat pump capable of performing heating and cooling simultaneously is provided. The heat pump includes a compressor, indoor devices that heat or cool an indoor space, outdoor heat exchangers, and switching devices. The outdoor heat exchangers are configured to individually operate as a condenser or an evaporator depending on a ratio of heating to cooling of the indoor devices. When an operation mode is changed, continuous heating and cooling is performed without stopping the system.

Abstract: An air conditioner having a heat-source side unit including a compressor and a heat-source side heat exchanger, plural use-side units each having a use-side heat exchanger and an inter-unit pipe for connecting the heat-source side unit to the plural use-side units, including an auxiliary heat source unit having a water-refrigerant heat exchanger for heat-exchanging refrigerant with water, a refrigerant side of the water-refrigerant heat exchanger being selectively connectable to one of the high-pressure gas pipe and the low-pressure gas pile through one of a first change-over valve and a second change-over valve, and also connected to a liquid pipe through an expansion valve, and a controller for controlling the auxiliary heat source unit so that the water-refrigerant heat exchanger of the auxiliary heat source unit functions as an evaporator with a water side thereof serving as a heat source when some of the user-side units are under heating operation.

Abstract: One embodiment of the present invention is a method for setting and controlling temperature of a device that includes: (a) thermally contacting the device to a heat transfer apparatus, the heat transfer apparatus having an apparatus intake to receive thermal transfer fluid, an apparatus exhaust to output thermal transfer fluid, and a conduit to conduct thermal transfer fluid from the apparatus intake to the apparatus exhaust through the heat transfer apparatus; (b) flowing a first thermal transfer fluid in a first thermal control circuit at a first temperature, and flowing a second thermal transfer fluid in a second thermal control circuit at a second temperature; (c) at a first predetermined time, directing the first thermal transfer fluid to flow to the apparatus intake, and from the apparatus exhaust back to the first thermal control circuit and the second thermal transfer fluid to flow in the second thermal control circuit without flowing to the apparatus intake; and (d) at a second predetermined time, di

Abstract: An internal cooling apparatus for automobiles includes a first expansion valve for spraying a coolant to a main evaporator through a high-pressure pipe, a compressor receiving the coolant evaporated in the main evaporator through a low-pressure pipe, a condenser receiving the coolant compressed in the compressor, and a plurality of sub-evaporators each being installed inside of a seat to contact an automobile passenger. One end of each of the sub-evaporators is communicated with the high-pressure pipe and the other end thereof is communicated with the low-pressure pipe such that part of the coolant sprayed through the first expansion valve is supplied to the compressor via each of the sub-evaporators.

Abstract: In an air-conditioning system for a vehicle, which has multiple heat sources (an evaporator and a heat accumulator), either one of the heat sources, for which the input energy amount for the unit cooling capacity is smaller than that for the other heat source, is preferentially used for performing the cooling operation, an energy amount for the air-conditioning operation can be reduced.

Abstract: A method of analyzing a refrigeration system (1) comprising at least one compressor (4), at least one condenser (5) and at least two refrigeration entities (2), each comprising at least one evaporator (9). Based on information relating to the gas production by the evaporators (9) it is determined whether or not two or more evaporators (9) are running in a synchronized manner, i.e. are switching between an active and an inactive state at least substantially simultaneously. In case two or more evaporators (9) are running in a synchronized manner, the refrigeration system (1) may be controlled in order to desynchronize the evaporators (9). This may, e.g., be done by changing a cut-in temperature and/or a cut-out temperature for one of the corresponding refrigeration entities (2). Synchronization causes undesired variations in the suction pressure, and preventing synchronization therefore results in a more appropriate control of the refrigeration system (1). Reduces wear on the compressors (4).

Abstract: A refrigerated transport system includes a prioritizing algorithm to limit the maximum amount of refrigerant flow available to at least one limited cooling compartment by holding a delta T (difference between the supply air temperature and return air temperature) instead of a setpoint temperature in the at least one limited cooling compartment when the available cooling capacity is insufficient to hold a substantially constant temperature in all compartments. A method for creating multiple refrigerated compartment spaces having precision temperature control includes the steps of: prioritizing the compartments by identifying at least one priority compartment to be held at a setpoint temperature; and limiting refrigerant flow to all but the priority compartment when there is insufficient cooling capacity to maintain all compartments at their respective setpoint temperatures.

Abstract: A method for controlling a vapour compression system, such as a refrigeration system, preferably an air condition system, comprising at least two evaporators. While monitoring a superheat (SH) at a common outlet for the evaporators, the amount of available refrigerant is controlled in response to the SH and in order to obtain an optimum SH value. The available refrigerant is distributed among the evaporators in accordance with a distribution key. The distribution key is preferably obtained while taking individual consideration to operating conditions for each of the evaporators into account. Thereby the vapour compression system can be operated in such a way that each of the evaporators is operated in an optimal manner, and in such a way that the system in general is operated in an optimal manner.

Abstract: A refrigeration cycle controls a second evaporator while a first evaporator is operating. The refrigeration cycle of the present invention makes a differential pressure between an inlet refrigerant pressure and an outlet refrigerant pressure of a second evaporator solenoid valve when starting or stopping the second evaporator during operation of the first evaporator smaller than the differential pressure when operating only the first evaporator, then opening or closing the second evaporator solenoid valve.

Abstract: An ejector cycle device includes a compressor, a refrigerant radiator, an ejector having a nozzle part and a refrigerant suction port, and a branch passage for introducing refrigerant branched on an upstream side of the nozzle part of the ejector in a refrigerant flow into the refrigerant suction port. Furthermore, a first evaporator is arranged on a downstream side of the ejector in the refrigerant flow, and a second evaporator is arranged in the branch passage. In addition, in the ejector cycle device, a refrigerant flow rate ratio (?) of a flow rate of refrigerant flowing in the second evaporator to a flow rate of refrigerant discharged from the compressor is set within a range from 0.07 or more to 0.93 or less.

Abstract: A first evaporator connected to an outlet side of an ejector, a second evaporator connected to a refrigerant suction port of the ejector, a throttle mechanism arranged on an inlet side of a refrigerant flow of the second evaporator and for reducing the pressure of the refrigerant flow are provided. Furthermore, the ejector, the first evaporator, the second evaporator and the throttle mechanism are assembled integrally with each other to construct an integrated unit having one refrigerant inlet and one refrigerant outlet. Hence, mounting performance of an ejector type refrigeration cycle can be improved.

Abstract: An ice-making system is adapted to operate within a section of a refrigeration appliance where the ice-making system and the ice made in the ice-making system are exposed to a temperature greater than zero degrees Centigrade. When installed in the fresh food compartment of a refrigerator that also has a freezer section compartment, the refrigeration system furnishes a cooling effect to the freezer compartment sufficient to maintain the freezer compartment at a temperature of zero degrees or less and separately furnish to the ice-making unit a cooling effect sufficient to freeze water for making ice in the ice-making unit of the ice-making system. The ice-making system can include a reservoir that is operatively associated with the ice-making unit of the ice-making system for delivering water to the ice-making unit and for receiving water returned from the ice-making unit.

Abstract: A system, configured to be disposed in a information technology equipment rack for providing ice thermal storage, includes a tank configured to hold water, a heat exchanger disposed in water in the tank and configured to convey a two-phase liquid and vapor refrigerant and to transfer heat between the water and the refrigerant, a first valve connected to a liquid and a vapor refrigerant line and configured to selectively connect the liquid refrigerant line to a first port and the vapor refrigerant line to a second port in a first mode and to connect the liquid refrigerant line to the second port and the vapor refrigerant line to the first port in a second mode, a thermostatic expansion valve connected to an inlet of the heat exchanger, and a liquid/vapor pump connected to an outlet of the heat exchanger and to the second port of the first valve.

Abstract: An air conditioning system and an apparatus for protecting the same. The air conditioning system comprise an outdoor unit, a plurality of indoor units connected to the outdoor unit by each refrigerant line, and a refrigerant line closing unit installed at the refrigerant line of the indoor unit for preventing a refrigerant flowing on the refrigerant line of the indoor unit from being introduced into the outdoor unit when power supply to one or more indoor units is cut off.

Abstract: An integrated cooling system includes two separate evaporator coils. Each evaporator coil has its own shutoff, thereby allowing for individual control over the cooling of each of two vehicle spaces. The evaporator coils may be disposed within the vehicle to cool the passenger compartment and a battery compartment, respectively. The separate control afforded by the cooling system provides the flexibility of shutting off cooling to the vehicle passenger compartment for the comfort of the vehicle occupants, while still providing cooling to the battery, as needed. The cooling system includes a number of control features which provide for automatically shutting off cooling to one or more of the evaporator coils based on parameters such as air temperature and refrigerant pressure.

Abstract: A portable air conditioning and water-cooling unit includes a mass of refrigerant and a compressor for compressing the refrigerant. The unit also includes a single condenser for condensing the refrigerant and a pipe connecting the compressor and condenser. First and second capillary tubes and first and second connectors connect the first capillary tube to the condenser and a second connector connects the second capillary tube to the condenser. In addition, the unit includes an air conditioning evaporator and a pipe for connecting the air conditioning evaporator to the first capillary tube for cooling air. A water supply is also provided as well as a water-cooling evaporator and pipe connecting the water-cooling evaporator to the second capillary tube. A first thermostat senses the temperature of the water and sends a signal to a solenoid valve for stopping the flow of refrigerant to the second capillary tube when the water reaches a pre-selected temperature.

Abstract: An air conditioning unit is for cooling and dehumidifying outside air for flowing into an enclosed space from outside. The unit is interposable between a first evaporator coil and a first condenser coil and comprises a second evaporator coil that is positioned to receive outside air for channeling therethrough from an outer to an inner side and thence to the enclosed space. A second condenser coil is positioned to receive outside air for channeling therethrough from an inner to an outer side and thence to the outside. A compressor is in fluid communication with and upstream of the second condenser coil and downstream of the second evaporator coil. Another embodiment is intended as a unitary system and includes a unitary compressor and condenser coil, with one evaporator coil for processing inside air and another for channeling outside air into the enclosed space.

Abstract: A multi-unit air conditioner and a method for controlling the same are disclosed which are capable of preventing continuous introduction of a refrigerant into indoor units in an OFF state where the indoor units can be independently powered on or off, thereby preventing a degradation in the cooling and heating efficiencies. The air conditioner includes a plurality of indoor units each including a power controller adapted to independently power on or off an associated one of the indoor units, an outdoor unit connected with the indoor units, the outdoor unit including a microcomputer for controlling an operation of the outdoor unit, and enabling the outdoor unit to communicate with the indoor units, and a controller for determining whether each of the indoor units is in a normal operation state or in a non-operation state, and controlling an operation of a distributor in accordance with the result of the determination.

Abstract: An air conditioner, in which a controller is installed separately from a plurality of indoor units and a plurality of outdoor units so that only the controller is added and conventional outdoor units are used when plural indoor units are required, thereby reducing costs due to the omission of other outdoor units. The controller determines whether or not the outdoor units are respectively operated according to a signal of a temperature sensing unit, and selectively operates the outdoor units according to a required capacity, thereby increasing the operating efficiency of the air conditioner.

Abstract: A method of switching refrigerant flow between a path to a freezer evaporator in a freezer compartment and a path to a fresh food evaporator in a fresh food compartment of a refrigerator includes providing a three-way valve with at least three operational positions in flow communication with the path to the fresh food evaporator and the path to the freezer evaporator. A temperature difference (dtZ) between a freezer compartment temperature and a freezer evaporator evaporating temperature is measured. A temperature difference (dtF) between a fresh food compartment temperature and a fresh food evaporator evaporating temperature is measured. The operation of the three way valve is controlled based on at least one of dtZ and dtF.

Abstract: In a vehicle air conditioner, a cooling heat exchanger for cooling air is arranged in the air conditioning case, and a cooling/heating switching heat exchanger is arranged at a downstream air side of the cooling heat exchanger in the air conditioning case. A first bypass passage is provided at one side of the cooling heat exchanger in the air conditioning case, so that air flows through the first bypass passage while bypassing the cooling heat exchanger. A second bypass passage is provided at one side of the cooling/heating switching heat exchanger in the air conditioning case on an opposite side of the first bypass passage with respect to the first heat exchanger, so that air flows through the second bypass passage while bypassing the cooling/heating switching heat exchanger. Accordingly, a size of the air conditioner can be effectively decreased while a maximum cooling capacity can be sufficiently obtained.

Abstract: A method for controlling a multi-unit air conditioner is disclosed which is capable of preventing frost from being formed on the outer surface of a refrigerant line. In order to control an air conditioner including an outdoor unit, a plurality of indoor units corresponding to the out door unit, and a plurality of refrigerant lines for connecting the indoor units to the outdoor unit, respectively, the method includes the steps of measuring respective states of the refrigerant lines using a measurement sensor, determining respective states of the refrigerant lines, based on measurement data obtained by the measurement sensor, and controlling an operation state of an operating one or operating ones of the indoor units, in accordance with the determined state of the refrigerant line associated with the operating indoor unit or each operating indoor unit.

Abstract: A method for controlling operation of a refrigerator to enable independent cooling of a freezing chamber and a refrigerating chamber. The method prevents temperature rising of the refrigerator by controlling a refrigerant passage switching valve after stopping operation of a compressor, thereby reducing electricity consumption and increasing humidification effects of the refrigerator by controlling an operating time point of a refrigerating chamber fan.

Abstract: A bypass factor of an evaporator is used to indicate when an air filter of an HVAC is clogged. The bypass factor represents the amount of air that is bypassed without direct contact with the evaporator. As the air filter clogs, the bypass factor decreases. The bypass factor can also be used for early detection of clogging of the air filter. A first bypass factor is calculated by using the temperature measurements, and a second bypass factor is calculated by using the airflow rate of the air. The difference between the two bypass factors determines the error. An increase in the error indicates that the air filter is clogged. A coefficient of performance of the evaporator can also be calculated to detect if the air filter is clogged. A decrease in the coefficient of performance indicates that the air filter is clogged.

Abstract: The invention provides a refrigerator having a two-stage compression compressor capable of performing efficient cooling of a both a refrigerator compartment and a freezer compartment. A high-pressure delivery outlet of a two-stage compression compressor 12 is connected to a condenser 14, the condenser 14 is connected to a three-way valve 15, a first outlet of the three-way valve 15 is connected via an R capillary tube 16 and an R evaporator 18 to an intermediate-pressure intake of the two-stage compression compressor 12, is connected and via an F capillary tube 24 to an F evaporator 26, the F evaporator is connected to a low-pressure intake of the two-stage compression compressor 12 via a low-pressure suction pipe 28, the three-way valve 15 can switch between a simultaneous cooling mode and a freezer mode, and when in the simultaneous cooling mode the interior temperature of the refrigerator compartment 2 falls to a predetermined temperature it switches to the freezer mode.

Abstract: The present invention provides a method and apparatus for using hot gas to defrost sequentially each refrigerated display case (evaporator) in a group of refrigerated display cases (evaporators). A unique cross-feed line connects the distributor and the evaporator suction line for each evaporator in the group of evaporators. Like a typical hot gas defrost system, the sequential hot gas defrost system may be time-initiated and time-terminated or time-initiated and temperature-terminated. Each evaporator in the group of evaporators is defrosted in turn while the remaining evaporators in the group continue to operate in the refrigeration mode. A unitary combination check valve and orifice simplifies the sequential hot gas defrost refrigeration system.

Abstract: An apparatus and method for compressing gas refrigerant using two different compressors operated alternatively in a series or parallel mode for obtaining two different compression ratios and thereby provide efficient operation for both a relatively lower suction pressure and a relatively higher suction pressure. This system avoids an unbalanced mass flow rate when the compressors are operated in series by unloading a downstream one of the compressors. When operated in the series mode, refrigerant is bypassed back to a suction inlet of the downstream compressor during a portion of a compression stroke of the downstream compressor for equalizing the mass flow rate through the two compressors.

Abstract: A multi air conditioning system for adjusting the amount of refrigerant flowing into indoor units determined to be in a stopped state, to improve the overall system efficiency, and a method for operating the multi air conditioning system. The method includes determining whether or not some indoor units are in a stopped state; measuring temperatures of heat exchangers of the indoor units in the stopped state; and changing opening degrees of valves installed in those indoor units determined to be in the stopped state to change the amount of refrigerant flowing therein if the temperatures of the heat exchangers of the stopped indoor units deviate from a reference range.

Abstract: A subcooling heat exchanger and subcooling expansion valve in a refrigeration system provide subcooling of a pre-subcooled portion, for refrigerating a thermal load, of condensed refrigerant liquid by a pre-subcooling portion of the condensed refrigerant liquid. The amount of subcooling of the pre-subcooled portion is determined by measuring, with a pressure sensor, refrigerating suction pressure exerted by refrigerating compressors of the system. A controller then controls, based on the refrigerating suction pressure, modulation of mass of pre-subcooling portion, relative pre-subcooled portion, and expansion thereof in the subcooling expansion valve, which controls the amount of refrigerant heat exchanged, and therefore subcooling of pre-subcooled portion, between the pre-subcooling portion and the pre-subcooled portion in the subcooling heat exchanger. The pre-subcooling portion is then subsequently compressed by a subcooling compressor.

Abstract: An apparatus for refrigeration system control includes a plurality of circuits, each circuit having at least one refrigeration case and an electronic evaporator pressure regulator in communication with each circuit. Each electronic evaporator pressure regulator controls a temperature of one of the circuits. A sensor in communication with each circuit measures a parameter from the circuit. A controller associated with each electronic evaporator pressure regulator controls the respective electronic evaporator pressure regulator based upon measured parameters from each of the circuits.

Abstract: A light device for refrigerators or freezers includes a sensor, a first manual switch, a rotatable switch, an interior loop and an alternative current power supply. The interior loop includes an interior circuit, an exterior circuit and a control loop. The alternative current power supply is connected to the rotatable switch which is electrically connected the first manual switch and the control loop via the interior circuit. The control loop is electrically connected to a magnetic device and electrically connected to the interior circuit in series. The interior circuit and the exterior circuit are electrically connected in parallel and then both are connected to an earth end of the alternative current power supply. The refrigerator is equipped with functions of automatic light controlled and anti-theft.

Abstract: A commercial refrigeration system including a compressor, a condenser, a valve, and an evaporator coil, all of which are in fluid communication. The refrigeration system further including a fixture adapted to be cooled by the evaporator coil, a system controller operable to control operation of the refrigeration system, and a subsystem controller in communication with the system controller. The subsystem controller being operable to monitor at least one parameter of a subsystem having at least one of the compressor, condenser, valve, and fixture, and being further operable to execute a command from the system controller to affect the operation of the subsystem.

Abstract: A method of switching refrigerant flow between a path to a fresh food evaporator in a fresh food compartment and a path to a freezer evaporator in a freezer compartment of a refrigerator, wherein the fresh food evaporator is coupled to a first fan and the freezer evaporator is coupled to a second fan, and wherein the method includes providing a three way valve with at least three operational positions in flow communication with the fresh food path and the freezer path, switching the three way valve between the operational positions, activating the first fan, deactivating the second fan, and delivering the refrigerant.

Abstract: A method for regulating a most loaded circuit of a refrigeration system is provided. Each circuit includes at least one case and an EEPR valve. At least one controller communicates with the EEPR valves for receiving signals from the circuits corresponding to operating conditions for each circuit, and for issuing command signals to the EEPR valves and compressor. The operation of each circuit is monitored and a load signal is calculated for each circuit. The load signals for each circuit are compared and the most loaded circuit is determined. The EEPR valve of the most loaded circuit is adjusted to be approximately 100 percent open and a suction pressure of the compressor is adjusted to move a circuit temperature of the most loaded circuit to a target temperature. The process of selecting and regulating the most loaded circuit is repeated after a predetermined period of time.

Abstract: A method and apparatus for refrigeration system control includes a control system operable to meet cooling demand and control suction pressure for a plurality of refrigeration circuits each including a variable valve and an expansion valve. The controller controls the variable valve independently of the expansion valves to meet cooling demand by determining a change in a measured parameter and controlling at least one of the variable valves based upon the change to an approximately fully open position.

Abstract: Method for controlling a multi-type air conditioner having a plurality of indoor units each with an expansion valve, an indoor heat exchanger, and an indoor fan, some of which heat rooms, and rest of which are turned off, including the steps of (S11) defining a saturation temperature of refrigerant by using a heating cycle of the refrigerant, and Mollier chart, (S12) measuring a temperature of the refrigerant stagnant at the turned off indoor units, (S13) determining if a temperature difference of the refrigerant temperature and the saturation temperature is within a temperature range preset at a control part, (S14) opening the expansion valves of the turned off indoor units, if the temperature difference is within the temperature range preset at the control part, and (S15) closing the expansion valve of the turned off indoor units, if the temperature difference is not within the temperature range preset at the control part, whereby minimizing stagnation of refrigerant at turned off indoor units during some o

Abstract: An integrated cooling system having two separate evaporator coils is provided. Each evaporator coil has its own shutoff, thereby allowing for individual control over the cooling of each of two vehicle spaces. The evaporator coils may be disposed within the vehicle to cool the passenger compartment and a battery compartment, respectively. The separate control afforded by the cooling system provides the flexibility of shutting off cooling to the vehicle passenger compartment for the comfort of the vehicle occupants, while still providing cooling to the battery, as needed. The cooling system includes a number of control features which provide for automatically shutting off cooling to one or more of the evaporator coils based on parameters such as air temperature and refrigerant pressure.

Abstract: An apparatus for controlling the temperature of an electronic device. The apparatus comprises a refrigeration system including a compressor and a multi-pass heat exchanger. The refrigeration system is operative to circulate a refrigerant fluid through a fluid flow loop such that the refrigerant fluid will change between gaseous and liquid states to alternately absorb and release thermal energy. The refrigerant fluid is pre-cooled in the heat exchanger by a pre-cooling refrigerant stream. A thermal head is connected into the fluid flow loop and has a temperature controlled surface.

Abstract: A dual evaporator air conditioning system and method for use therewith to cool air in front and rear portions of a cabin of a vehicle. The dual evaporator air conditioning system includes primary and auxiliary HVAC units to cool the air in the front and rear portions of the cabin, respectively. The dual evaporator air conditioning system also includes a control system having cooling and non-cooling modes for each of the HVAC units. The control system automatically activates a heating element near the auxiliary evaporator in response to the auxiliary HVAC unit being in the non-cooling mode while the primary HVAC unit is in the cooling mode. The heating element heats the refrigerant in the auxiliary evaporator to prevent accumulation of liquid refrigerant and lubricating oil in the auxiliary evaporator when the auxiliary HVAC unit is in the non-cooling mode while the primary HVAC unit is in the cooling mode.

Abstract: A method and apparatus for refrigeration system control includes an evaporator pressure regulator and sensor in communication with one of a plurality of refrigeration circuits. The sensor is operable to measure a parameter of the refrigeration circuit. A controller is operable to adaptively control a suction pressure of the compressor rack based upon the measured parameter, whereby the controller controls a circuit temperature for one of the plurality of circuits. Further, the controller is operable to control the electronic evaporator pressure regulator to control the temperature in the one of a plurality of refrigeration circuits by determining a change in the parameter and updating a set point based upon the change of parameter.

Abstract: Multi-type air conditioner including an outdoor unit having a compressor, an outdoor heat exchanger, a flow path control valve for controlling a flow path of the refrigerant from the compressor, and an outdoor unit piping system, a plurality of indoor units each having an indoor expansion device, an indoor heat exchanger, and an indoor piping system, a distributor for selectively distributing the refrigerant from the outdoor unit to the indoor units and returning to the outdoor unit again proper to respective operation modes, and noise preventing means on pipelines respectively connected to the indoor units to cut off refrigerant flow into inoperative indoor units when the air conditioner is in operation, for preventing occurrence of refrigerant flow noise at the inoperative indoor units.

Abstract: A refrigerator includes a refrigeration compartment having an upper region and a lower region, a first evaporator positioned in the upper region, a second evaporator, positioned in the lower region, and a fan disposed between the first and second evaporators. The fan is configured, such that air flows past first and second evaporators and is discharged into said upper and lower regions when said fan is energized.

Abstract: A vapor compression system (10) including an evaporator (16), a compressor (12), and a condenser (14) interconnected in a closed-loop system. In one embodiment, a multifunctional valve (18) is configured to receive a liquefied heat transfer fluid from the condenser (14) and a hot vapor from the compressor (12). A saturated vapor line (28) connects the outlet of the evaporator (16) and is sized so as to substantially convert the heat transfer fluid exiting the multifunctional valve (18) into a saturated vapor prior to delivery to the evaporator (16). The multifunctional valve (18) regulates the flow of heat transfer fluid by monitoring the temperature of the heat transfer fluid returning to the compressor (12) through a suction line (30) coupling the evaporator (16) outlet to the compressor (12) inlet. In one preferred embodiment, a bifurcated liquid line connects the condenser (14) outlet to the first inlet of an multifunctional valve and the inlet of a metering unit.