Abstract: In order to provide a refrigeration cycle device that is compact and efficiently utilizing an expansion machine and reduced in manufacturing cost through the use of a first compressor and second compressor driven by an expansion machine, a heat radiator and an on-off valve are disposed between the first and the second compressors and the second heat radiator is utilized irrespective of the operating mode such as the cooling or heating operation. Also, the heat transfer area ratio, which is a ratio of the heat transfer area of the second heat source side heat exchanger relative to the total heat transfer area of the heat transfer areas of said first and second heat source side heat exchangers, is set, according to the air speed distribution, within a range at which the COP is at its peak. Thus, the second heat source side heat exchanger can be utilized even during the heating operation, providing a high efficiency refrigeration cycle device.

Abstract: An air conditioner is provided, in which some of a plurality of outdoor heat exchangers implement a defrosting operation and others implement a heating operation. The air conditioner includes a compressor to compress refrigerant, a hot gas pipe to which a part of the refrigerant compressed in the compressor is moved, a 4-way valve to which the remaining refrigerant compressed in the compressor is moved, an indoor heat exchanger in which the refrigerant, having passed through the 4-way valve, undergoes heat exchange with indoor air, and a plurality of outdoor heat exchangers, some of which implement a heating operation as the heat-exchanged refrigerant from the indoor heat exchanger is moved therethrough while others implement a defrosting operation as the refrigerant having passed through the hot gas pipe is moved therethrough.

Abstract: The present disclosure provides a method of operation of a refrigerant system, which comprises a main refrigerant circuit, a reheat circuit, and a flow control device, which has a first position isolating said reheat circuit from said main refrigerant circuit, and a second position placing said reheat circuit in fluid communication with said main refrigerant circuit. The refrigerant system further comprises a controller in electrical communication with said flow control device. The controller is configured to move the flow control device to the first position during a cooling mode, and to move the flow control device to the second position during a reheating mode or an oil recovery mode. The refrigerant system controller can execute an oil recovery mode in continuous or intermittent manner.

Abstract: A heating/cooling system includes a closed circuit refrigeration system including an evaporator. Water circulating through a closed water circuit exchanges heat with refrigerant in the evaporator, cooling the water for a cooling application. The water can also be heated by a boiler, and the heated water is used to heat a space. A water pump flows the water through the water circuit. When a current sensing relay detects a power failure, a boiler control algorithm is initiated to “trick” a motor of the compressor into believing the heating/cooling system is operating in a heating mode. Therefore, a compressor failure alarm is not generated. The water pump is powered by a battery pack during the power failure. Water continues to flow through the water circuit, preventing the water from freezing.

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 using for a dehumidifying cooling device has developed that comprising a heating source for producing hot water, a heat exchanger for transferring heat from the hot water to circulating water, a circulation pump for circulating the resulting hot water heated in the heat exchanger, a heating pipeline connected to the circulation pump for conveying the hot water to a heat supply target area, a user heat exchanger connected to the heating pipeline for conveying hot water to the heat supply target area, a dehumidifying cooling device connected to a hot water pipe of users heat exchanger and installed in each household within the heat supply target area, the dehumidifying cooling device removing moisture from the air by using hot water supplied from the hot water pipe to deal with latent heat load and to lower the temperature of the dehumidified air via evaporation of water contained in the air.

Abstract: The invention relates to a system which is used to cool at least one piece of motor vehicle equipment to a low temperature, comprising a heat transfer fluid circulation loop. According to the invention, a low-temperature heat exchanger (60) and at least one equipment exchanger (102) are mounted to the aforementioned circulation loop. The heat exchange surface of the equipment exchanger (102) is divided into at least first and second heat exchange sections (104,106). A first flow (Q<SB>1</SB>) of heat-transfer fluid passes through the first heat exchange section (104), while a second smaller flow (Q2) passes through the second section. The invention is suitable for motor vehicle heat exchangers.

Abstract: An air conditioner performs a refrigerant quantity judging operation to judge the refrigerant quantity in a refrigerant circuit, and includes a heat source unit, utilization units, expansion mechanisms, a first refrigerant gas pipe, a second refrigerant gas pipe, a refrigerant liquid pipe, switching mechanisms, temperature detecting means, and a controller. The heat source unit includes a compression means and a heat source side heat exchanger. The first refrigerant gas pipe is connected to the discharge side of the compression means. The switching mechanism can switch between a first state and a second state. The temperature detecting means are mounted on the first refrigerant gas pipe, and configured to detect a refrigerant temperature on the first refrigerant gas pipe side and output a refrigerant temperature detection value. The controller corrects the refrigerant quantity judged by a refrigerant quantity judging operation based on the refrigerant temperature detection value.

Abstract: Refrigerant sent from a heat source side circuit (14) to utilization side circuits (11, 12, 13) is made to be single-phase liquid by using cooling means (36, 45) or a vapor-liquid separator (35). Variable-opening utilization side expansion valves (51, 52, 53) are provided in the utilization side circuits (11, 12, 13) so that an expansion process in a refrigeration cycle is performed also in the circuits.

Abstract: In a refrigerating cycle apparatus and control method thereof, a controller sets a high-pressure pressure target value from thermal load and temperature conditions based on refrigerant information that has been obtained from detectors, and controls at least one of a rotational frequency of a compressor, a degree of opening of an electronic expansion valve, a rotational frequency of an outdoor fan, or a rotational frequency of an indoor fan to match a high-pressure pressure to the high-pressure pressure target value that has been set. Here, a threshold value is set when the high-pressure pressure target value is set, and a method for setting the high-pressure pressure target value is modified depending on whether the high-pressure pressure is greater than or equal to the threshold value or less than the threshold value when the high-pressure pressure target value is decided.

Abstract: An improved refrigerant system incorporates at least two circuits arranged in a cascaded relationship. Preferably, the upper circuit utilizes a hydrocarbon refrigerant and preferably the lower circuit utilizes CO2 refrigerant. Preferably, the CO2 circuit mainly operates in a subcritical region. To improve the efficiency and capacity control of the cascaded refrigerant system, at least one of the circuits is equipped with performance enhancement features such as, for example, an economized function provided by a flash tank or economizer heat exchanger. Additional enhancement features can also include a liquid-suction heat exchanger and bypass function.

Abstract: A refrigeration apparatus (1) is disclosed which is provided with multiple systems of utilization-side heat exchangers (20, 30, 40) and in which liquid-side interunit piping lines (53, 54, 55) are combined into a single liquid-side interunit piping line in multiple systems of liquid lines. When the refrigeration apparatus (1) provides space heating of 100% heat recovery without the use of an outdoor heat exchanger (15), the flow of refrigerant in a refrigerant circuit (50) is stabilized even when the temperature of outside air is low, thereby preventing the capacity to provide refrigeration from decreasing.

Abstract: An ejector refrigerant cycle device includes a radiator for radiating heat of high-temperature and high-pressure refrigerant discharged from a compressor, a branch portion for branching a flow of refrigerant on a downstream side of the radiator into a first stream and a second stream, an ejector that includes a nozzle portion for decompressing and expending refrigerant of the first stream from the branch portion, a decompression portion for decompressing and expanding refrigerant of the second stream from the branch portion, and an evaporator for evaporating refrigerant on a downstream side of the decompression portion. The evaporator has a refrigerant outlet coupled to the refrigerant suction port of the ejector. Furthermore, a refrigerant radiating portion is provided for radiating heat of refrigerant while the decompression portion decompresses and expands refrigerant. For example, the refrigerant radiating portion is provided in an inner heat exchanger.

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

Abstract: A unit for an ejector-type refrigeration cycle includes an ejector, first and second evaporators connected in parallel to a downstream side of the ejector and configured to evaporate the refrigerant discharged from the outlet of the ejector, and a refrigerant distributor configured to distribute the refrigerant discharged from an outlet of the ejector to a side of the first evaporator and a side of the second evaporator. The ejector draws refrigerant from a refrigerant suction port by a high-velocity refrigerant flow jetted from a nozzle portion, and mixes the refrigerant injected from the nozzle portion with the refrigerant drawn from the refrigerant suction port so as to discharge the mixed refrigerant from the outlet of the ejector. The ejector and the refrigerant distributor are connected to each other such that the refrigerant discharged from the outlet of the ejector directly flows into the refrigerant distributor.

Abstract: A method and apparatus for maintaining a relatively constant temperature of a working fluid in an evaporator of a refrigeration system by providing a constant volumetric displacement compressor and a heat exchanger for exchanging heat between the high pressure and low pressure portions of a refrigeration circuit to superheat, and hold substantially constant, the temperature of the refrigerant entering the compressor. In doing this, the pressure of the refrigerant in the low pressure portion of the circuit, including the evaporator, and the mass flow rate of the refrigerant remain substantially constant. As a result, the temperature of the saturated refrigerant in the evaporator remains substantially constant.

Abstract: A transcritical vapor compression system that includes a fluid circuit circulating a refrigerant in a closed loop. The fluid circuit has operably disposed therein, in serial order, a compressor, a first heat exchanger, a first capillary tube and a second heat exchanger. The compressor compresses the refrigerant from a low pressure to a supercritical pressure. The first heat exchanger is positioned in a high pressure side of the fluid circuit and the second heat exchanger is positioned in a low pressure side of the fluid circuit. The first capillary tube reduces the pressure of the refrigerant from a supercritical pressure to a relatively lower pressure. The refrigerant flows through the first capillary tube at its critical velocity and means for controlling the temperature of the refrigerant in the first capillary tube are provided.

Abstract: A refrigerant system incorporates an economizer circuit, and a thermoelectric cooler to provide a performance boost to the conventional economized refrigerant system. A thermoelectric cooler cools the refrigerant either directly in a main refrigerant circuit, or in an economized circuit, or both.

Abstract: Multi-type air conditioner comprising an outdoor unit installed in an outdoor, comprising a compressor, a refrigerant flow controlling part connected to a discharge end of the compressor for guiding the refrigerant proper to operation conditions selectively, an outdoor heat exchanger connected to the refrigerant flow controlling part, a defrosting device at a side of the outdoor heat exchanger, and a piping system connected between the parts, a plurality of indoor units each installed in a room and having an indoor heat exchanger and an electronic expansion valve having one end connected to one end of the indoor heat exchanger, and a distributor between the outdoor unit and the indoor units for selectively guiding refrigerant from the outdoor unit to the plurality of indoor units proper to operation conditions, and guiding the refrigerant passed through the indoor units to the outdoor unit again.

Abstract: An object is to improve performance and efficiency of an air conditioning device constituted of a waste heat utilization circuit in which waste heat of a heat source is utilized in heating a room to be conditioned in a heat exchanger for heating; a refrigerant circuit in which carbon dioxide is used as a refrigerant and which has a supercritical pressure on a high pressure side; and a cascade heat exchanger which performs heat exchange between a fluid flowing from the heat source to the heat exchanger for heating in the waste heat utilization circuit and the refrigerant of the refrigerant circuit, the refrigerant discharged from a compressor is passed through the cascade heat exchanger, the refrigerant discharged from the cascade heat exchanger is divided by a flow divider, one divided refrigerant is passed from an auxiliary pressure reduction unit to an internal heat exchanger to perform heat exchange between the refrigerant and the refrigerant discharged from the cascade heat exchanger and then sucked into

Abstract: In a refrigeration cycle apparatus having an expansion mechanism, a method to swiftly generate a pressure difference upstream and downstream of the expansion mechanism of, thereby enhancing the starting performance of the refrigeration cycle apparatus. The apparatus has a compression mechanism, a utilizing-side heat exchange, an expansion mechanism for recovering power, and a heat source-side heat exchanger. The revolution number of the heat source fluid transfer means is made smaller than a target revolution number or the heat source fluid transfer means is stopped during a predetermined time after the compression mechanism is started. When the compression mechanism is started, the pressure difference can be generated upstream and downstream of the expansion mechanism for a short time, the operation of the expansion mechanism does not become unstable, vibration and noise can be prevented, and the refrigeration cycle apparatus can swiftly be started.

Abstract: A refrigerant vapor compression system includes a flash tank economizer defining a separation chamber is disposed in the refrigerant circuit intermediate a refrigerant heat rejection heat exchanger and a refrigerant heat absorption heat exchanger. A primary expansion valve is interdisposed in the refrigerant circuit in operative association with and upstream of the refrigerant heat absorption heat exchanger and a secondary expansion valve is interdisposed in the refrigerant circuit in operative association and upstream of the flash tank economizer. A refrigerant vapor injection line establishes refrigerant flow communication between an upper portion of the separation chamber and an intermediate pressure stage of the system's compression device and a suction pressure portion of the refrigerant circuit.

Abstract: To a refrigerant circuit (20) of an air conditioner (10) as a refrigerating apparatus, a plurality of outdoor units (30, 40) are connected. In an operation state where the first outdoor unit (30) is operated with the second outdoor unit (40) stopped, the air conditioner (10) performs refrigerant collection operation for collecting and retaining surplus refrigerant to and in a second outdoor heat exchanger (42) of the second outdoor unit (40). During the refrigerant collection operation, a second outdoor expansion valve (43) is closed fully, and a second outdoor fan (46) is operated. Part of refrigerant discharged from a first compressor (31) flows into the second outdoor heat exchanger (42) during the refrigerant collection operation. The refrigerant flowing in the second outdoor heat exchanger (42) dissipates heat to outdoor air to be condensed. Since the second outdoor expansion valve (43) is closed fully, the condensed refrigerant is retained in the second outdoor heat exchanger (42).

Abstract: A climate control system (10) for a cab/berth of a vehicle, comprises a climate control circuit (12) in which a first refrigerant circulates between at least an energy accumulator (20) in which an accumulator refrigerant is in heat exchange with the first refrigerant, a radiator (22) in the cab/berth to adjust a temperature of the cab/berth, and a heat-exchange unit (23). A refrigeration circuit (14) is provided for submitting a second refrigerant to a refrigeration cycle. An evaporation stage (43) is in heat-exchange relation with the heat-exchange unit (23) of the climate control circuit (12) such that the second refrigerant absorbs heat from the first refrigerant.

Abstract: A refrigerant system is configured to alternatingly run in an economized mode and a standard mode. A control system shifts the refrigerant system between the economized mode and standard mode responsive to a determined efficiency reflecting a combination of at least two of: compressor isentropic efficiency; condenser efficiency; evaporator efficiency; efficiency of hardware mechanically powering the compressor; and a mode-associated cycling efficiency. In a bypass mode, a bypass refrigerant flow from an intermediate port may return to the suction port. Shifting into the bypass mode may be similarly controlled based upon the determined efficiency.

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: A refrigerant circuit (11) in an air conditioner (10) includes a compressor (20) and an expander (30). In the compressor (20), refrigerant compressed by a compression mechanism (21) is discharged into the internal space of a compressor casing (24). In the compressor (20), refrigeration oil which has accumulated in the bottom of the compressor casing (24) is supplied to the compression mechanism (21). The refrigeration oil in the bottom of the compressor casing (24) is directly introduced into an expansion mechanism (31) of the expander (30) through an oil supply pipe (41).

Abstract: Disclosed is an air conditioner that can operate in a general cooling mode in which indoor air is cooled by heat exchange with a first refrigerant in a main evaporator, or alternatively in a fast cooling mode in which the indoor air is primarily cooled by heat exchange in a midway heat exchanger which includes the main evaporator for the first refrigerant and a fast cooling condenser for a second refrigerant, and then re-cooled in a fast cooling evaporator for the second refrigerant. Accordingly, fast and agreeable air cooling can be achieved.

Abstract: A compressor has a housing. A crank is carried by the housing for rotation about a crank axis. A cylinder is defined within the housing and has a proximal portion and a distal portion. The distal portion is smaller in transverse cross-sectional area than is the proximal portion. A piston is held within the housing for reciprocal movement at least partially within the cylinder. The piston also has a distal portion smaller in transverse cross-sectional area than a proximal portion. A connecting rod is pivotally coupled to the crank for relative rotation about a proximal axis and to the piston for relative rotation about a distal axis. A first compression chamber exists in the cylinder distal portion beyond the end of the piston. A second compression chamber exists in the cylinder proximal portion beyond a piston shoulder. The first and second compression chambers are non-series and non-parallel.

Abstract: A refrigeration system includes a compressor. A heat rejection heat exchanger is downstream of the compressor along a refrigerant primary flowpath. An expansion device is downstream of the heat rejection heat exchanger along the primary flowpath. A heat absorption heat exchanger is downstream of the expansion device along the primary flowpath. An economizer heat exchanger is between the heat rejection heat exchanger and the expansion device along the primary flowpath. The economizer heat exchanger includes a first portion configured to provide heat transfer from the primary flowpath to a first economizer flowpath. The economizer heat exchanger includes a second portion configured to provide heat transfer from the primary flowpath to a second economizer flowpath.

Abstract: A refrigeration system can incorporate a cooling-liquid injection system that can inject a cooling liquid into an intermediate-pressure location of the compressor. The cooling liquid can absorb the heat of compression during the compression of the refrigerant flowing therethrough. The refrigeration system can include an economizer system that injects a refrigerant vapor into an intermediate-pressure location of the compressor in conjunction with the injection of the cooling liquid. A refrigeration system can include a liquid-refrigerant injection system that can inject liquid refrigerant into an intermediate-pressure location of the compressor. The injected liquid refrigerant can reduce the discharge temperature of the refrigerant. The liquid-refrigerant injection system can be used with the cooling-liquid injection system and/or the economizer system.

Abstract: A refrigerant system utilizes an expander, where at least partially expanded refrigerant portion is tapped at the intermediate expansion point and passed through an economizer heat exchanger. In the economizer heat exchanger, the tapped refrigerant further cools refrigerant in a main liquid line. The present invention eliminates the need for a separate dedicated economizer circuit expansion throttling device, by utilizing a single expander to provide this expansion function. This invention also allows for the recovery of the expansion work, otherwise lost in the economizer expansion throttling device. System capacity and efficiency are improved by providing additional thermal potential for the refrigerant expanded (partially or fully) in the expander during more efficient isentropic process. In various embodiments, there may be more than a single economizer circuit, with each of said economizer circuits receiving the tapped refrigerant portions from the expander at different intermediate expansion points.

Abstract: To provide a refrigerating apparatus that can control the supercooling degree of liquid refrigerant irrespective of changes in circulating refrigerant amounts in a refrigeration cycle, a refrigerating apparatus includes a refrigeration cycle having one or more compressors or inverter compressor, a condenser, an expansion valve, and an evaporator; a liquid introduction circuit that guides decompressed refrigerant obtained by extracting one part of high pressure liquid refrigerant from the refrigeration cycle and decompressing, to a supercooling heat exchanger provided in the refrigeration cycle to perform heat transfer between the decompressed refrigerant and high pressure liquid refrigerant, and then introduces the refrigerant into refrigerant for intake into the compressors or inverter compressor or an intermediate pressure part of these compressors; a controller controlling shutdown of the compressors or driving frequencies of the inverter compressor based on suction pressure detection values with respect t

Abstract: An ejector refrigerant cycle device includes a radiator for radiating heat of high-temperature and high-pressure refrigerant discharged from a compressor, a branch portion for branching a flow of refrigerant on a downstream side of the radiator into a first stream and a second stream, an ejector that includes a nozzle portion for decompressing and expending refrigerant of the first stream from the branch portion, a decompression portion for decompressing and expanding refrigerant of the second stream from the branch portion, and an evaporator for evaporating refrigerant on a downstream side of the decompression portion. The evaporator has a refrigerant outlet coupled to the refrigerant suction port of the ejector. Furthermore, a refrigerant radiating portion is provided for radiating heat of refrigerant while the decompression portion decompresses and expands refrigerant. For example, the refrigerant radiating portion is provided in an inner heat exchanger.

Abstract: A refrigerant vapor compression system includes a compression device, a heat rejecting heat exchanger, an economizer heat exchanger, an expander and an evaporator disposed in a refrigerant circuit. An evaporator bypass line is provided for passing a portion of the refrigerant flow from the main refrigerant circuit after having traversed a first pass of the economizer heat exchanger through the expander to partially expand it to an intermediate pressure and thence through a second pass of the economizer heat exchanger and into an intermediate pressure stage of the compression device. An economizer bypass line is also provided for passing a portion of the refrigerant from the main refrigerant circuit after having traversed the heat rejecting heat exchanger through a restrictor type expansion device and thence into the evaporator bypass line as liquid refrigerant or a mix of liquid and vapor refrigerant for injection into an intermediate pressure stage of the compression device.

Abstract: A preconditioned air system for cooling an interior cabin space of a parked aircraft includes a thermal energy storage unit, which contains a thermal energy storage medium for storing cooling capacity. During use, a ground-based air-cooling unit is placed in thermal communication with the thermal energy storage medium. The ground-based air-cooling unit draws upon cooling capacity that has been stored previously within the thermal storage medium for cooling the interior cabin space. Storage of cooling capacity is performed during off-peak demand times and/or during low power cost times. System modularity supports cooling of variously sized aircraft even under extreme temperature conditions.

Abstract: A refrigerant system utilizes an expander that provides a more efficient expansion process and recovers at least a portion of energy from this expansion process. At least a portion of refrigerant that has been at least partially expanded in the expander is tapped and passed through an economizer heat exchanger. In the economizer heat exchanger, the tapped refrigerant cools a main circuit refrigerant increasing its thermodynamic potential. Further, a compression section is provided with at least two compressors operating in tandem and allowing for multiple stages of unloading. By selectively utilizing one or more of the tandem compressors, the economizer cycle, and the expander, the refrigerant system can achieve very efficient operation and provide enhanced control flexibility, in particular, for the CO2 refrigerant system operating in the transcritical cycle.

Abstract: A refrigerant system is provided with at least two stages of compression connected in series. An intercooler is positioned intermediate the two stages and is cooled by an indoor air stream. The intercooler is positioned to be in a path of air flow passing over an indoor heat exchanger, and preferably downstream of the indoor heat exchanger, in relation to this airflow. The intercooler cools the refrigerant flowing between the two compression stages as well as provides the reheat function. Benefits with regard to system performance (efficiency, capacity and reliability) are achieved with no additional circuitry or components required to provide the intercooler and reheat functions. This invention is particularly important for the CO2 refrigerant systems operating in the transcritical cycle. Methods of control are presented for both the intercooler and reheat functions.

Abstract: The present invention relates to a cooling device (20) for installation in an aircraft, in particular a passenger aircraft. The cooling device (20) comprises a heat exchanger (26) configured for flow-through of a liquid coolant for pre-cooling a cooling chamber (34) of the cooling device (20) to a temperature of the liquid coolant, the heat exchanger (26) being coupled in a heat-transferring manner to a refrigerant (28) which is in thermal contact with the cooling chamber (34) of the cooling device (20) for cooling the cooling chamber (34) to a temperature which is below the temperature of the liquid coolant, wherein the heat exchanger (26) and the refrigerant (28) are disposed inside the cooling chamber (34) of the cooling device (20), and wherein the heat exchanger (26) is configured for connection to a liquid coolant supply system installed on board the aircraft.

Abstract: An exemplary refrigeration system for cooling food or beverages may use a liquid cooling system of a vehicle. The refrigeration system may include a compartment in which the food or beverages may be placed and removed, a chilled liquid coolant system having a connection through which liquid coolant is received from the liquid cooling system of the vehicle, and a heat exchanger operationally coupled with the chilled liquid coolant system and the compartment to transfer heat from the compartment into the liquid coolant. The refrigeration system may also include a second chilled coolant system through which a second coolant flows and a second heat exchanger operationally coupled with the second chilled coolant system and the compartment to transfer heat from the compartment. The chilled liquid coolant system and the second chilled coolant system may operate together as a cascade cooling system.

Abstract: In a temperature control system using a controlled mix of high temperature pressurized gas and a cooled vapor/liquid flow of the same medium to cool a thermal load to a target temperature in a high energy environment, particular advantages are obtained in precision and efficiency by passing at least a substantial percentage of the cooled vapor/liquid flow through the thermal load directly, and thereafter mixing the output with a portion of the pressurized gas flow. This “post load mixing” approach increases the thermal transfer coefficient, improves control and facilities target temperature change. Ad added mixing between the cooled expanded flow and a lesser flow of pressurized gas also is used prior to the input to the thermal load. A further feature, termed a remote “Line Box”, enables transport of the separate flows of the two phase medium through a substantial spacing from pressurizing and condensing units without undesired liquefaction in the transport lines.

Abstract: A refrigeration-generation solar unit is provided for an air-conditioning system. The system includes a first heat exchanger comprising: absorption machine including a boiler and evaporator, the evaporator including at least a second heat exchanger, and the boiler including at least a third heat exchanger; a plurality of solar collectors; a first cooling fluid circuit between the first heat exchanger and the second heat exchanger; and a second heat-transfer fluid circuit between the third heat exchanger and the plurality of solar collectors. The second circuit includes a circulation pump supplying heat-transfer fluid to the plurality of solar collectors and a temperature sensor to measure the temperature of the heat-transfer fluid at the outlet of the plurality of solar collectors. The solar unit includes varies the operational delivery rate of the circulation pump according to the fluid temperature recorded by the temperature sensor at the outlet of the plurality of solar collectors.

Abstract: A refrigerant system incorporating a reheat circuit is also provided with pulse width modulation control to adjust the amount of refrigerant being compressed. In particular, in any dehumidification mode of operation, by activating the pulse width modulation control, sensible and latent components of capacity can be controlled independently and with significantly better accuracy. The present invention provides the ability to precisely tailor both humidity and temperature control to the conditioned space demands utilizing less expensive components and in a more efficient manner than in the prior art.

Abstract: An An air conditioning system includes an indoor heat exchanger, a fan, a compressor, an outdoor heat exchanger, and a control device. The fan sends air cooled or heated by the indoor heat exchanger and the like to a room in a house via a duct. The compressor is installed outside the house and the capacity thereof can be controlled. The outdoor heat exchanger, together with the indoor heat exchanger and the compressor, forms a heat pump. The control device controls the capacity of the compressor.

Abstract: A refrigerant system is provided with a multi-stage compression system. An intercooler is positioned between at least two compression stages to cool a refrigerant, by heat transfer interaction with a secondary fluid, after it has been compressed in the lower compression stages to some intermediate pressure. The intercooler enhances refrigerant system performance, improves compressor reliability, and extends operational envelope. Further, at least one economizer circuit is incorporated into the refrigerant system that returns the economized refrigerant flow at the location between at least two compression stages.

Abstract: An air conditioning apparatus includes a supercooling heat exchanger configured to exchange heat between a high-pressure refrigerant and a low-pressure refrigerant. A high-pressure liquid refrigerant pipe is wound around an external periphery of a low-pressure refrigerant suction pipe. Preferably, the supercooling heat exchanger is disposed inside the indoor unit at a position below an evaporator. Drain water from the evaporator is dispersed over the supercooling heat exchanger or a drain pipe leading from a drain pan of the evaporator is wound together with the high-pressure liquid refrigerant pipe around the low-pressure refrigerant suction pipe. In either case, cold energy of the drain water is made to effectively acts on the high-pressure liquid refrigerant pipe to exchange heat. The supercooling heat exchanger operates with improved efficiency without any increase in the volume of the heat exchanger so that the evaporator can be made as small and compact as possible.

Abstract: A refrigeration device includes a control unit, and a refrigerant circuit in which a compression mechanism, a radiator, a refrigerant cooling unit, a first expansion mechanism, a liquid receiver, a second expansion mechanism, and an evaporator are connected in sequence. The control unit performs refrigerant cooling control whereby the refrigerant is cooled by the refrigerant cooling unit so that the state of the refrigerant that has flowed out from the first expansion mechanism is near the saturation line and not near the critical point.

Abstract: A refrigerator or a freezer comprises a primary refrigeration system (11) which is augmented with a passive secondary refrigeration loop (15) having a condenser (30) in thermal contact with a primary fluid line (12) at the location between a primary compressor (16) and a primary condenser (18) and preferably placed outside a building so that the passive secondary refrigeration loop (15) provides cooling to the primary refrigeration system (11) when the outside temperature is sufficiently low The condenser (30) of the passive secondary refrigeration loop (15) is positioned above the points where the primary fluid line (12) connects with mlet (32) and outlet (34) lines of the secondary loop condenser (30)

Abstract: A refrigerant system, which utilizes CO2 as a refrigerant, includes a main closed-loop refrigerant circuit and a booster closed-loop refrigerant circuit. A heat accepting heat exchanger, which provides extra cooling for the refrigerant circulating through the main circuit, and thus improves refrigerant system performance, also serves as a shared component coupling the two circuits through heat transfer interaction. Various schematics and configurations for the booster circuit, which may be combined with other performance enhancement features, are disclosed. Additional benefits for economizer function, “liquid-to-suction” heat exchanger, intercooling and liquid injection are also presented. The booster circuit may also contain CO2 refrigerant.

Abstract: A water generating system comprising: a pressurized condenser capable of being overpressurized; said pressurized condenser comprising a moisture laden air inlet and a moisture depleted air outlet, each inlet and outlet further having valves, respectively; said pressurized condenser further comprising a cold water inlet attached by a cold water transport conduit to a cold water pump, a warm water outlet and a heat exchanger that is in fluid communication between the cold water inlet and the warm water outlet; a moisture laden air transport conduit attached to the moisture laden air inlet; an air pump/conditioner attached to a distal end of the moisture laden air transport; said air pump/conditioner capable of significant creating a significant overpressurization air pressure in the pressurized condenser; a moisture depleted air transport conduit attached to the moisture depleted air outlet; and a water recovery outlet attached to a water reservoir via a water recovery conduit.