Abstract: A pulse tube refrigerating machine, comprising a pulse tube (11) connected to a regenerator (9) and having a hot end part (11a) being heated, in which a cooling device (30), for cooling the hot side tube wall (11cd) of the pulse tube by cooling medium lower in temperature than the hot side tube wall of the pulse tube, cools the hot side tube wall (11cd) of the pulse tube by coolant flowing from the pressure source (1) of the pulse tube refrigerating machine into the regenerator (9).

Abstract: An integrated-type suction pipe module for refrigerators, and a refrigerator having the integrated-type suction pipe module allow a suction pipe to be completely isolated from an interior of the refrigerator and an atmosphere. The integrated-type suction pipe module includes a suction pipe, and a foam body. The suction pipe defines a refrigerant path between an evaporator and a compressor. The suction pipe has an exposed part placed in a machine room which is exposed to an atmosphere, and an embedded part which is placed to be isolated from the atmosphere. The embedded part is disposed in the foam body. The construction enhances work efficiency while producing a refrigerator, and simplifies a design of a machine room to provide a better appearance. Further, the suction pipe is completely isolated from the atmosphere, thus preventing dew from being formed on the suction pipe. A heat exchanging effect between a capillary tube and the suction pipe is maximized.

Abstract: A vehicle air conditioner selectively switches one of a cooling mode in which an interior heat exchanger of a refrigerant cycle is operated as an evaporator for cooling air, and a heating mode in which the interior heat exchanger is operated as a radiator for heating air. In the vehicle air conditioner, an accumulator, for separating gas refrigerant and liquid refrigerant from each other and for storing the separated liquid refrigerant therein, is disposed between an outlet of the interior heat exchanger and a suction port of a compressor. Further, the accumulator includes a heating device for heating the liquid refrigerant stored in the accumulator in the heating mode. Therefore, heating performance for heating air in heating mode can be efficiently improved.

Abstract: Refrigerant is circulated through a vapor compression system including a compressor, a condenser, an expansion device, and an evaporator. Cold condensate forms on the evaporator surfaces as the refrigerant accepts heat from an air stream. The cold condensate drips down from the evaporator coil and collects in a condensate pan. In one example, the cold condensate is directed into a condensate heat exchanger to subcool the refrigerant exiting the condenser. In another example, the refrigerant exiting the condenser flows through a refrigerant line located in the condensate pan. In another example, the cold condensate is sprayed on the refrigerant line exiting the condenser or on the subcooling portion of the condenser. By utilizing the condensate for further subcooling of the refrigerant, system capacity and efficiency are enhanced. Various control techniques and condensate flow methods are also disclosed.

Abstract: A refrigerant cycling device is provided, wherein a compressor comprises an electric motor element, a first and a second rotary compression elements in a sealed container. The first and the second rotary compression elements are driven by the electric motor element. The refrigerant compressed and discharged by the first rotary compression element is compressed by absorbing into the second rotary compression element, and is discharged to the gas cooler.

Abstract: A refrigerant system is operable in either a heating mode or cooling mode. The system is also provided with an economizer cycle that will function in either heating mode or cooling mode. A pair of economizer heat exchangers are positioned adjacent to an air conditioning economizer expansion device, and a heat pump economizer expansion device, respectively. A control for the system will control the opening either the air conditioning economizer expansion device or the heat pump economizer expansion device, dependent on whether economized operation is desired, and whether the system is in cooling or heating mode. Thus, a pair of heat exchangers are utilized, with one being selected for economizer operation dependent on whether the system is in cooling or heating mode.

Abstract: A system and method is disclosed for creating and/or maintaining an electrical load on a diesel engine generator for use on a marine vessel in order to avoid the harmful effects of no-load or low-load operation of the diesel engine. The parasitic load bank system 10 utilizes the heat transfer fluid 23 contained in the closed circulation loop 28 of a chille7d-fluid air conditioning system 14 for creating and/or maintaining the electrical load on the diesel engine generator 12 by utilizing a load bank controller 44 for diverting a portion 23c of the heat transfer fluid 23a being supplied to the vessel's air handlers 42 into heat exchange relationship with the heat transfer fluid 20b discharged from the air conditioning system's source of heat transfer 18 such that the heat exchanged heat transfer fluid 23f activates the source of heat transfer 18, which may be a chiller, reverse-cycle chiller or heat pump, to create an electrical power demand on the diesel engine generator 12.

Abstract: The apparatus is a hybrid cooler which includes one loop within which a heated evaporator forms vapor that moves to a condenser because of the vapor pressure which also drives the liquid condensate from the condenser to a liquid reservoir. A second loop is powered by a mechanical pump that supplies liquid from the reservoir to the evaporator and the second loop also returns excess liquid not vaporized to the reservoir. An optional reservoir cooler can be used to assure that the reservoir temperature and vapor pressure are always lower that the temperatures and pressures of the evaporator and condenser.

Abstract: Various refrigerant system schematics incorporate the ability to bypass refrigerant around a condenser, to selectively provide refrigerant of a desired thermodynamic state to downstream system components, including a reheat coil located downstream of the condenser. In addition, the reheat coil may be utilized in combination, or independently from an economizer cycle, that is also incorporated into the system design. The economizer branch can be configured in a sequential or parallel arrangement relative to the reheat coil. Consequently, a wide spectrum of sensible and latent load demands can be satisfied. Furthermore, various schematics provide distinct benefits and flexibility in unloading and temperature and humidity control, also resulting in system performance and reliability enhancement.

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: The performance of a multi-stage inertance pulse tube cryocooler in accordance with an embodiment of the present invention may be enhanced by cooling the inertance tube of one stage placing it in thermal communication with the cool heat exchanger of a preceding stage. Cooling at least one inertance tube of a multi-stage cooler in this invention lowers the viscosity and sound speed of the gas in the inertance tube, thereby improving the cooling power for that subsequent cooling stage, and for the entire device.

Abstract: A refrigerant cycle system includes a first heat-exchanging portion for condensing gas refrigerant discharged from a compressor, a gas-liquid separator into which all of refrigerant after passing through the first heat-exchanging portion and a part of gas refrigerant discharged from the compressor are introduced, and a second heat-exchanging portion for cooling and condensing refrigerant flowing from the gas-liquid separator. Because all of the condensed refrigerant from the first heat-exchanging portion is introduced into the gas-liquid separator, a passage area of a gas refrigerant introduction passage for introducing gas refrigerant from the compressor into the gas-liquid separator can be set relatively large. Therefore, a dimension difference of the gas refrigerant introducing passage in manufacturing is not greatly affected to an adjustment of a liquid refrigerant amount in the gas-liquid separator.

Abstract: This duplex-type heat exchanger is adapted to a vapor compression type refrigeration cycle in which a condensed refrigerant is decompressed and then evaporated. This duplex-type heat exchanger is integrally equipped with a subcooler S in which the condensed refrigerant exchanges heat with the ambient air A to be subcooled and an evaporator E in which the decompressed refrigerant exchanges heat with the ambient air A to be evaporated. Heat exchange is performed between the refrigerant passing through the subcooler S and the refrigerant passing through the evaporator E, to thereby cool the refrigerant in the subcooler S and heat the refrigerant in the evaporator E. Accordingly, according to this heat exchanger, a high refrigeration effect can be obtained while avoiding the pressure rise of the refrigerant.

Abstract: Multiple refrigerant circuits are operated in parallel, and each has an economizer cycle. One of the two circuits may have a greater capacity than the other. By controlling the two circuits to run in economized, conventional, bypassed, or economizer bypassed operation, the control is able to match demanded capacity. Moreover, by exercising similar technique, the control can provide better humidity control, can limit or maintain head pressure, and can avoid power consumption peaks.

Abstract: To prevent heat transfer inhibition and an increase in pressure loss due to refrigerating machine oil discharged into a cycle, and to provide a compact and highly efficient refrigerating cycle apparatus using carbon dioxide gas (CO2).

Abstract: A refrigerant cycle is provided with tandem compressors. Only some of the multiple compressors are provided with an economized cycle, and an optional unloader valve for selectively returning flow from an economizer injection port back to suction. The present invention thus provides the economized operation capabilities and benefits for a refrigerant cycle having tandem compressors, without the complexity of providing separate economizer arrangement for each of the compressors.

Abstract: A vapor compression system includes a main vapor compression circuit including a compressor, a condenser, an expansion device and an evaporator serially connected by main refrigerant lines, the compressor having a main discharge port, a suction port and an economizer/bypass port, an economizer circuit connected between the condenser and the economizer/bypass port of the compressor and including an auxiliary expansion device and a heat exchanger serially connected by economizer refrigerant lines, the economizer refrigerant lines and the main refrigerant lines being exposed to each other for heat exchange in the heat exchanger; and a bypass circuit including a bypass line extending from the economizer/bypass port to the suction port, and a bypass valve positioned along the bypass line, the bypass valve being positionable between a closed position wherein the economizer circuit is active and the bypass circuit is inactive, and an open position wherein the economizer circuit is active and the bypass circuit is ac

Abstract: The present invention provides an oil equalizing circuit for a refrigeration system provided with a plurality of compression mechanisms, the oil equalizing circuit being capable of supplying sufficient oil to the compressors that are running during partial load operation. The refrigeration system compression mechanism is provided with the following: first, second, and third compressors; a refrigerant intake main pipe; first, second, and third intake branch pipes connected to the intake sides of the compressors; first, second, and third oil separators connected to the discharge sides of the compressors; and first, second, and third oil return pipes provided on the oil separators. The first oil return pipe is configured such that oil is delivered to the refrigerant intake main pipe due to gravity when only the first compressor is running. The second oil return pipe is configured such that oil is delivered to the refrigerant intake main pipe due to gravity when only the first and second compressors are running.

Abstract: A refrigerant cycling device is provided, wherein a compressor comprises an electric motor element, a first and a second rotary compression elements in a sealed container. The first and the second rotary compression elements are driven by the electric motor element. The refrigerant compressed and discharged by the first rotary compression element is compressed by absorbing into the second rotary compression element, and is discharged to the gas cooler.

Abstract: A flash tank configuration for an economizer is provided that is inexpensive and simple to construct, reliable to operate, and efficient for use in an economizer compression refrigeration system. The configuration includes an upper baffle and a lower baffle configured and arranged within the flash tank so as to separate the liquid and gas phases of intermediate pressure refrigerant, and to convey each phase to other components in the refrigeration systems. The flash tank has a generally cylindrical shape, and is dimensioned so as to provide adequate internal volume for expansion of refrigerant to a desired pressure, separation of the resulting refrigerant gas and refrigerant liquid phases, and temporary storage of the refrigerant phases before conveying the liquid phase to the main refrigerant line between the condenser and the evaporator, and returning the gas phase to the compressor. Additionally, methods are provided for using the flash tank to separate refrigerant phases.

Abstract: A cooling apparatus (1) has a compressor (2), a condenser (3), an expansion valve (5), an evaporator (6) and an electric valve (10), all connected to each other in this order by a piping line to form a refrigeration circuit. The apparatus further has a heating section (11) and a bypass (12), and a thermosensitive tube (13) of the expansion valve is disposed between the heating section (11) and the electric valve (10) so that temperature of a refrigerant having left this section is detected before entering this valve (10). The refrigerant remains as a gas-liquid mixture until it leaves the evaporator (6) such that temperature of the refrigerant is uniform within the evaporator and equal to the saturation vapor temperature of this refrigerant, and therefore fluctuation in the refrigerant temperature is diminished.

Abstract: The internal heat exchanger 7 is provided which exchanges heat between the refrigerant of low pressure and the refrigerant of high pressure, and the pre-load adjusting mechanism of the expansion valve 5 is abolished. Due to the above structure, the refrigerant flowing into the expansion valve 5 is cooled in the internal heat exchanger 7, and enthalpy of the refrigerant flowing into the evaporator 6 is reduced. On the contrary, the refrigerant sucked into the compressor 1 is heated. Accordingly, a difference in enthalpy between the refrigerant at the inlet and the refrigerant at the outlet of the evaporator 6 can be made large, and the heat absorbing capacity of the evaporator 6 can be enhanced, and further it becomes possible to give the degree of superheat to the refrigerant sucked into the compressor 1. Therefore, even if the pre-load adjusting mechanism is abolished, the vapor-compression-type refrigerating machine can be stably operated.

Abstract: A refrigeration cycle for a vehicle air conditioning system allows the refrigerant-to-refrigerant heat exchanger to exchange heat between a high-pressure liquid refrigerant, which is delivered from the sub-cooling condenser and directed to the evaporator, and a low-pressure refrigerant having a liquid and gas phase, which is delivered from the evaporator and directed to the compressor. The refrigeration cycle also allows the amount of the refrigerant circulating through the refrigeration cycle to be adjusted in response to the level of sub-cooling upstream of a throttle hole of a reverse sub-cooling control valve to thereby indirectly control the level of superheating on the outlet side of the evaporator. This provides improvements both in the amount of heat to be exchanged between refrigerants in the refrigerant-to-refrigerant heat exchanger and the cooling performance of the evaporator.

Abstract: An air conditioner includes a compressor for compressing refrigerant, an exterior heat exchanger for performing heat exchange between refrigerant and outside air, an interior heat exchanger for performing heat exchange between the refrigerant and air to be blown into the compartment, an ejector for decompressing high-pressure refrigerant, a heater core for heating air using a high-temperature fluid as a heating source, and a fluid-refrigerant heat exchanger that heats the fluid flowing to the heater core using high-temperature refrigerant discharged from the compressor as a heating source. In a dehumidifying and heating operation, refrigerant in the interior heat exchanger absorbs heat from air so that the air is cooled and dehumidified, and the dehumidified and cooled air can be further heated in the heater core by indirectly using the heating source from the high-temperature refrigerant.

Abstract: A multi-stage compression type rotary compressor, having a driving element and a first and a second rotary compression element that are driven by the driving element in a sealed container, is provided. The refrigerant compressed by the first rotary compression element is discharged into the sealed container, and said discharged refrigerant with an intermediate pressure is then compressed by the second rotary compression element. By cooling the refrigerant absorbed into the second rotary compression element, the rise in the temperature of the refrigerant that is compressed and discharged by the second rotary compression element can be suppressed. And, the supercooling degree of the refrigerant is increases before reaching the expansion valve to improve the cooling ability of the evaporator.

Abstract: A refrigerant cycle includes economized tandem compressors. The refrigerant cycle is also provided with a common economizer circuit for all tandem compressors. Common manifolds communicate discharge, suction and economizer return flows within the refrigerant cycle to each of the tandem compressors. Also, an optional unloader function is provided for each of the compressors. Various arrangements allow enhanced operation control, improved system reliability and reduced equipment life-cycle cost.

Abstract: In a high-pressure side heat exchanger for a vapor compression refrigerant cycle, a refrigerant passage is formed such that a flow area (S), a length (L), and an equivalent diameter (d) satisfy the conditional expression 0.04×e?1.8d?S/L?2.1×e?1.8d. The flow area (S) is obtained by dividing the product of a total cross-sectional area of the passages in one tube and the number of tubes by the path number. The length (L) is a flow distance of the refrigerant from the refrigerant inlet to the refrigerant outlet. That is, the length (L) is obtained by the product of the length of the tube and the path number. The diameter (d) is obtained by dividing the product of four and the cross-sectional area of the passage by a circumference of the passage.

Abstract: An air conditioner includes a compressor for compressing refrigerant, an exterior heat exchanger for performing heat exchange between refrigerant and outside air, an interior heat exchanger for performing heat exchange between the refrigerant and air to be blown into the compartment, a decompression unit for decompressing high-pressure refrigerant, and a heater that heats air using high-temperature refrigerant discharged from the compressor as a heating source. In a dehumidifying and heating operation, refrigerant in the interior heat exchanger absorbs heat from air so that the air is cooled and dehumidified, and the heater heats air having been dehumidified and cooled by using the heating source, so that low-humidity and high-temperature air is supplied into the compartment. The heater can be disposed to indirectly heat air by heating a fluid flowing through a heater core for heating air, or to directly heat air to be blown into the compartment.

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, an outdoor expansion device for expanding liquid refrigerant introduced thereto in a condensed state via indoor units and providing to the outdoor heat exchanger when the room is heated, 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 means for super cooling the refrigerant condensed at the outdoor heat exchanger or the indoor heat exchangers and flowed to the indoor expansion devices or to the outdoor expansion device, thereby super cooling the refrigerant supplied to the evaporator.

Abstract: Vehicle air-conditioning system, in particular CO2 air conditioner, the refrigerant cycle of which comprises the following components: a compressor, a refrigerant cooler, an internal heat exchanger between the refrigerant-cooler side and the evaporator side, an expansion valve, and an evaporator. To switch the air-conditioning system from cooling-mode operation to heating-mode operation, between the compressor and the refrigerant cooler there is integrated an auxiliary heat exchanger corresponding to a cooling circulation on the engine side, such that downstream of the auxiliary heat exchanger there is disposed an expansion valve by means of which during heating-mode operation the refrigerant can be throttled to a lower pressure.

Abstract: A multi-function condenser for an air conditioning system includes a first header, a second header, a plurality of tubes, and a conduit. The tubes extend in parallel relationship between the headers for establishing fluid communication between the first header and the second header. The second header includes a header portion and a receiver portion. A conduit extends into and out of and is surrounded by the receiver portion to define a space between the conduit and the receiver portion. Heat is transferred between hot refrigerant flowing in the receiver portion, the header portion, and cooler refrigerant flowing through the conduit as the refrigerant flows through the conduit independently of the refrigerant flowing in the space and in the header portion to increase an overall efficiency of the air conditioning system.

Abstract: The efficiency of refrigeration systems operating on the vapor compression cycle and employing suction line heat exchangers is increased by introducing refrigerant into the lower pressure side of the suction line heat exchanger at a quality less than 1 and introducing refrigerant that has passed through the low pressure side of the suction line heat exchanger into the compressor inlet at a quality that is equal to 1.

Abstract: A multiple circuit refrigerant system includes a single economizer heat exchanger utilized for each of at least two circuits. The use of the single economizer heat exchanger reduces the cost of adding an economizer cycle, and further reduces other associated costs. Additionally, heat exchanger and overall system performance is enhanced further. Embodiments show the inclusion of two, three and four circuits, although greater numbers may also benefit form this invention.

Abstract: Disclosed is a refrigerant circuit which comprises a compressor (15), a water heat exchanger (16), a receiver (18), an expansion valve (19), and an evaporator (20). In the refrigerant circuit, a refrigerating cycle is carried out by compressing refrigerant to above a critical pressure in the compressor (15). A cooling section (17) for cooling refrigerant flowing out of the water heat exchanger (16) is provided on the upstream side of the receiver (18). A part of the evaporator (20) functions as an air heat exchanger which operates as the cooling section (17). The cooling section (17) exchanges heat with refrigerant on the outlet side of the evaporator (20).

Abstract: A refrigerant system is operable in either heating mode or cooling mode. The system is also provided with an economizer cycle that will function in either heating mode or cooling mode. A four-way valve assembly selectively communicates refrigerant from either an indoor heat exchanger or outdoor heat exchanger to an economizer heat exchanger. The valve assembly further includes a restriction for restricting a refrigerant flow downstream of the economizer heat exchanger. The valve assembly provides two distinct restrictions such that a different size restriction is presented to the flow in cooling and heating modes. In this way, a single valve assembly can provide both the required routing for the alternative heating and cooling modes, and at the same time allow for distinct restriction sizes for the two modes without the necessity of separate expansion devices, also improving overall system cost and reliability.

Abstract: A compressor has an economizer injection line communicating into the compressor compression chambers. An unloader valve selectively communicates the economizer injection line back to a point upstream of the evaporator. When the compressor is run in unloaded mode, partially compressed refrigerant is thus returned to a point upstream of the evaporator. In unloaded mode, this results in a higher refrigerant mass flow through the evaporator, as compared to prior art where the bypassed refrigerant was returned downstream of the evaporator. This increases system efficiency by more effectively returning oil which otherwise might be left in the evaporator back to the compressor. Also, the amount of refrigerant superheat entering the compressor in unloaded operation is reduced as compared to the prior art compressor systems, wherein the bypassed refrigerant is returned directly to the compressor suction line.

Abstract: An air-conditioning apparatus for a vehicle wherein noise in the passenger's compartment is reduced by suppressing transmission of vibration to the evaporator, and the prevention of coolant leakage is enhanced, and at the same time, the man-hours for inspection are reduced by reducing the number of pipe joints. The cooling capacity is also enhanced by replacing the sub-cooling process in the condenser and the super-heating process in the evaporator, and further space in the narrow engine compartment is effectively used.

Abstract: It is an object of the present invention to reduce the constraint that the density ratio is constant as small as possible, and to obtain high power recovering effect in a wide operation range by using an expander which is operated in accordance with a flowing direction of refrigerant.

Abstract: A cooling system including an evaporator, a suction line, a two stage compressor, a gas cooler and a capillary tube. The suction line receives gaseous or two phase refrigerant from the evaporator, the compressor receives the gaseous or two phase refrigerant from the suction line, and the gas cooler cools compressed refrigerant discharged from the compressor. The capillary tube carries refrigerant from the gas cooler to the evaporator, and the suction line may include two straight portions with two portions of the capillary tube helically wound therearound, with a bypass valve around the capillary tube, and an accumulator between the suction line portions. An inter-cooler is between stages of the compressor, and a pan collects water condensate from the air side of the evaporator, and the refrigerant tube carries cooled refrigerant from the gas cooler through the pan. A controller selectively turns the compressor on and off based on temperature or pressure sensed by a sensor.

Abstract: The efficiency of refrigeration systems operating on the vapor compression cycle and employing suction line heat exchangers is increased by introducing refrigerant into the lower pressure side of the suction line heat exchanger at a quality less than 1 and introducing refrigerant that has passed through the low pressure side of the suction line heat exchanger into the compressor inlet at a quality that is equal to 1.

Abstract: A refrigerant pipe connected to the suction side of the compressor 1 and a refrigerant pipe connected to the discharge side of the compressor 1 are integrated into one body, a refrigerant pipe connected to the inlet side of the condenser 2 and a refrigerant pipe connected to the outlet side of the condenser 2 are integrated into one body, and a refrigerant pipe connected to the inlet side of the decompressor 3 and a refrigerant pipe connected to the outlet side of the temperature detecting portion are integrated into one body. In this piping structure, a double pipe structure and double pipe joint structure are adopted in which an inner pipe for circulating fluid of high pressure and an outer pipe for circulating fluid of low pressure are formed differently from each other and the respective end portions of the pipes are joined to a joint member by a plastically deforming means.

Abstract: A compression refrigeration system includes a compressor (1), a heat rejector (2), expansion means (3) and a heat absorber (4) connected in a closed circulation circuit that may operate with supercritical high-side pressure. The refrigerant charge and component design of the system corresponds to a stand still pressure inside the system which lower than 1.26 times the critical pressure of the refrigerant when the temperature of the whole system is equalised to 60 degrees C. Carbon dioxide or a mixture of a refrigerant containing carbon dioxide may be applied as the refrigerant in the system.

Abstract: Refrigerant is circulated through an economized refrigeration system including a compressor, a gas cooler, a main expansion device, an economizer heat exchanger and an evaporator. After cooling, the refrigerant splits into an economizer flow path and a main flow path. Refrigerant in the economizer flow path is expanded to a low pressure and exchanges heat with the refrigerant in the main flow path in the economizer heat exchanger. The refrigerant in the main flow path is then expanded and heated in the evaporator and enters the compressor, completing the cycle. An accumulator positioned between the economizer heat exchanger and the compressor stores excess refrigerant in the system, regulating the amount of refrigerant in the system and the high pressure in the system. The amount of refrigerant in the accumulator is controlled by regulating the economizer expansion device.

Abstract: The air-conditioner includes a compressor configured to compress and discharge a refrigerant. The air-conditioner includes a condenser configured to cool the refrigerant with air outside of a vehicle compartment. The air-conditioner includes a throttle configured to expand the refrigerant. The air-conditioner includes an evaporator configured to cool air inside of the vehicle compartment to eliminate moisture from the air by the expanded refrigerant. The air-conditioner includes a first refrigerant passage having the condensed refrigerant between the condenser and the throttle. The air-conditioner includes a second refrigerant passage having the evaporated refrigerant between the evaporator and the compressor. The air-conditioner includes a refrigerant pipe located between the first and second passages and configured to exchange heat between the condensed and evaporated refrigerants.

Abstract: The compressor of a transport refrigeration system is divided into two sections, with each section having a suction inlet. The refrigerant vapor from the evaporator is passed to one of the suction inlets, whereas the refrigerant vapor from a subcooler circuit is passed to the other suction inlet. A valve is operated to selectively insert or remove the subcooler as capacity requirements vary. In one embodiment, a six cylinder reciprocating compressor is used with five cylinders compressing within a first section, and a single cylinder compressing in the other section containing the subcooler circuit.

Abstract: A vapor compression system includes a main circuit comprising a compressor, a condenser, an expansion device and an evaporator serially connected by main refrigerant lines, the compressor having a suction port, a discharge port and an intermediate pressure port; an economizer circuit having an auxiliary expansion device and economizer refrigerant lines connected between said condenser and at least one of said intermediate pressure port and said suction port of said compressor; a bypass circuit having bypass refrigerant lines connected between the intermediate pressure port and the suction port; and a heat exchanger adapted to receive a first flow from the main refrigerant lines and a second flow from at least one of the economizer circuit and the bypass circuit, the first flow and the second flow being positioned for heat transfer relationship within the heat exchanger, wherein the system is selectively operable in a first mode wherein the economizer circuit is active and the bypass circuit is inactive, and a

Abstract: This heat pump and dehumidifying apparatus have small energy-consumed per moisture-removed ratios. Their components include a pressurizer for raising refrigerant pressure; a condenser for condensing refrigerant, thereby heating a high-temperature heat source fluid; an evaporator for evaporating refrigerant to cool a low-temperature heat source fluid; and a heat exchanger in a refrigerant path connecting the condenser and the evaporator for evaporating and condensing refrigerant under an intermediate pressure between the condensor pressure and the evaporator pressure. The low-temperature heat source fluid is successively cooled by the heat exchanger, cooled by the evaporator, and heated by the heat exchanger. This fluid can be precooled by the heat exchanger before cooling in the evaporator, and heat removed during precooling can be returned to the fluid after cooling by the evaporator.

Abstract: A transport refrigeration system, the transport refrigeration system including a container defining an enclosed volume and a refrigeration module coupled to the container. The refrigeration module is disposed to regulate the temperature of the enclosed volume and includes a compressor having a discharge port and a suction port, a condenser heat exchanger unit operatively coupled to the discharge port, an evaporator heat exchanger unit operatively coupled to the suction port, a condenser fan disposed proximate to the condenser heat exchanger unit, an evaporator fan disposed proximate to the evaporator heat exchanger unit; and a suction modulation valve coupled to the suction port. The transport refrigeration system further includes a bypass module coupled to the refrigeration module. The bypass module includes: a bypass mode switch having a normal operation position and bypass operation position; and an operational mode switch having a full cool position and fan only position.

Abstract: An air conditioning unit including an expansion device (4) of the refrigerating fluid loop controlled to set the internal heat exchanger efficiency &eegr;, represented by the equation: &eegr;=TccTsc/TsrTsct, wherein: TccTsc and Tsr are respectively temperatures at the compressor input (1), and at the evaporator output (5) and at the fluid cooler output (2), at a reference value such that the fluid leaves the evaporator in a completely gaseous state and without overheating.

Abstract: The present invention relates to a combined regeneration cooling and heating system capable of enhancing a heat exchange efficiency based on a heat exchange between a high temperature refrigerant flowing in the interior of an expansion unit and a low temperature refrigerant flowing in the outside.