Abstract: A multi-stage refrigeration system is provided. The refrigeration system includes a first compression element which produces a first compressed refrigerant stream. A mixer combines the first compressed refrigerant stream with an auxiliary refrigerant stream. A second compression element is coupled to the mixer and produces a second compressed refrigerant stream. A first heat exchanger receives the second compressed refrigerant stream and generates a cooled stream. A stream splitter receives the cooled stream and provides first and second output streams. A first expansion valve receives the first output stream and controls the flow of the first output stream and a second expansion valve receives the second output stream and controls the flow of the second output stream. A second heat exchanger generates the auxiliary refrigerant stream provided to the mixer.

Abstract: An object is to provide an air conditioner in which a desiccant air conditioner is combined with a refrigerating device to cool an indoor by a refrigeration cycle including a compressor and the like and in which a drop of energy efficiency is suppressed. An air conditioner 200 includes a desiccant air conditioner 220 and a refrigerating device 210 which cools the indoor by a usual refrigeration cycle, this refrigerating device 210 has an auxiliary heat exchanger 17 between an outlet side of a heater 12 and an inlet side of an expansion valve 14, and this auxiliary heat exchanger 17 is disposed externally from an exhaust air passage 4 and a supply air passage 3.

Abstract: The present invention is directed to an internal combustion engine for making suction, compression, explosion, expansion and exhaust strokes in an operating chamber of variable volume defined between a housing and a piston. The internal combustion engine includes: an independent combustion chamber of fixed volume, formed in the housing and provided with a fuel supply device, for independently producing combustion therein; at least one communication passage for communicating the independent combustion chamber with the operating chamber of variable volume; and a control valve for allowing introduction of compressed air from the operating chamber into the independent combustion chamber and providing injection of combustion gas from the independent combustion chamber into the operating chamber at specified timing. The internal combustion engine is configured to independently produce main combustion without communication with the operating chamber.

Abstract: In a refrigerant cycle apparatus which is operated at a supercritical pressure on a high-pressure side, for a purpose of maintaining or enhancing performances or reducing generation of clogging or a dimension of a capillary tube, a compressor has a first compression element, and a second compression element which compresses a refrigerant compressed by the first compression element, a gas phase refrigerant in an intermediate pressure receiver is sucked into the second compression element of the compressor, a liquid phase refrigerant in the intermediate pressure receiver is pressure reduced in a second pressure reducing device, and introduced into an evaporator, and the first pressure reducing device comprises a capillary tube on an upstream side of the refrigerant, and throttling means on a downstream side of the capillary tube.

Abstract: The present invention is directed to an internal combustion engine for making suction, compression, explosion, expansion and exhaust strokes in an operating chamber of variable volume defined between a housing and a piston. The internal combustion engine includes: an independent combustion chamber of fixed volume, formed in the housing and provided with a fuel supply device, for independently producing combustion therein; at least one communication passage for communicating the independent combustion chamber with the operating chamber of variable volume; and a control valve for allowing introduction of compressed air from the operating chamber into the independent combustion chamber and providing injection of combustion gas from the independent combustion chamber into the operating chamber at specified timing. The internal combustion engine is configured to independently produce main combustion without communication with the operating chamber.

Abstract: A refrigerating machine comprising a compressor, a radiator, a pressure-reducing device, a gas-liquid separator, plural heat absorbers functioning selectively in different temperature zones, a unit for allowing introduction of gas refrigerant separated in the gas-liquid separator into an intermediate pressure portion of the compressor, and a low pressure side circuit in which liquid refrigerant separated in the gas-liquid separator is circulated, wherein the low pressure side circuit is provided with at least a heat absorber functioning in a low temperature zone.

Abstract: In a refrigerating machine, a water cooling device having a cooling tower or an ice heat storage tank is provided as a heat exchanger for cooling refrigerant after heat-exchange in a heat-source side heat exchanger between an outdoor expansion valve and the heat-source side heat exchanger.

Abstract: In a heat pump type hot water supply apparatus having a compressor (16), an outdoor heat exchanger (22), an expansion valve (24) and at least one indoor heat exchangers, and a water heat exchanger (18) for heat-exchanging refrigerant and water to achieve hot water, the water heat exchanger (18) is equipped in the refrigerant circuit so as to be connected to the outdoor heat exchanger (22) in series in the refrigerant circuit.

Abstract: A refrigerating machine including a two-stage compressor, a high-pressure gas cooler, a first expansion valve, an intermediate-pressure receiver, a second expansion valve, and an evaporator is further equipped with an intermediate-pressure refrigerant bypass circuit for bypassing gas refrigerant in the intermediate-pressure receiver to an intermediate-pressure portion of the two-stage compressor, a back flow preventing device provided to the intermediate-pressure refrigerant bypass circuit for preventing back flow of refrigerant from the two-stage compressor to the intermediate-pressure receiver, and a refrigerant-pressure control unit for controlling the pressure of the refrigerant in the intermediate-pressure receiver on the basis of the difference between a specific enthalpy of refrigerant discharged from the high-pressure gas cooler and a predetermined reference enthalpy.

Abstract: There is disclosed a cooling and heating system in which a refrigerant is used in a supercritical state and in which cooling and heating capacity can be controlled so as to maximize a coefficient of performance. A cooling and heating system 130 includes: an outdoor unit 101 indicating a compressor 102 and an outdoor heat exchanger 103a; a plurality of indoor units 105 including indoor heat exchangers 106; a high pressure tube 111; a low pressure tube 112; and an intermediate tube 113.

Abstract: An object is to provide an air conditioner in which a desiccant air conditioner is combined with a refrigerating device to cool an indoor by a refrigeration cycle including a compressor and the like and in which a drop of energy efficiency is suppressed. An air conditioner 200 includes a desiccant air conditioner 220 and a refrigerating device 210 which cools the indoor by a usual refrigeration cycle, this refrigerating device 210 has an auxiliary heat exchanger 17 between an outlet side of a heater 12 and an inlet side of an expansion valve 14, and this auxiliary heat exchanger 17 is disposed externally from an exhaust air passage 4 and a supply air passage 3.

Abstract: A heat pump apparatus that having a refrigerating cycle including a compressor, a gas cooler, a pressure reducing device and an evaporator and is designed so that water can be heated by the gas cooler. A refrigerant such as CO2 or the like working in a supercritical area is filled and used at a high-pressure side in the refrigerating cycle and a radiator is equipped between the exit of the gas cooler and the pressure reducing device. The refrigerant temperature at the exit of the radiator is kept at a substantially fixed temperature irrespective of the temperature of hot water to the gas cooler.

Abstract: A multi-stage refrigeration system is provided. The refrigeration system includes a first compression element which produces a first compressed refrigerant stream. A mixer combines the first compressed refrigerant stream with an auxiliary refrigerant stream. A second compression element is coupled to the mixer and produces a second compressed refrigerant stream. A first heat exchanger receives the second compressed refrigerant stream and generates a cooled stream. A stream splitter receives the cooled stream and provides first and second output streams. A first expansion valve receives the first output stream and controls the flow of the first output stream and a second expansion valve receives the second output stream and controls the flow of the second output stream. A second heat exchanger generates the auxiliary refrigerant stream provided to the mixer.

Abstract: In a refrigerant cycle apparatus which is operated at a supercritical pressure on a high-pressure side, for a purpose of maintaining or enhancing performances or reducing generation of clogging or a dimension of a capillary tube, a compressor has a first compression element, and a second compression element which compresses a refrigerant compressed by the first compression element, a gas phase refrigerant in an intermediate pressure receiver is sucked into the second compression element of the compressor, a liquid phase refrigerant in the intermediate pressure receiver is pressure reduced in a second pressure reducing device, and introduced into an evaporator, and the first pressure reducing device comprises a capillary tube on an upstream side of the refrigerant, and throttling means on a downstream side of the capillary tube.

Abstract: In a refrigerating machine, a water cooling device having a cooling tower or an ice heat storage tank is provided as a heat exchanger for cooling refrigerant after heat-exchange in a heat-source side heat exchanger between an outdoor expansion valve and the heat-source side heat exchanger.

Abstract: A refrigerating machine is equipped with a compressor 1, a radiator 2, a pressure-reducing device 3, a gas-liquid separator 4, a unit for introducing the gas refrigerant separated in gas-liquid separator 4 into an intermediate pressure portion of the compressor, and a low pressure side circuit 9 in which liquid refrigerant separated in the gas-liquid separator is circulated. The low pressure side circuit 9 is provided with a heat absorbing unit 10 which selectively functions in different temperature zones. When the heat absorbing unit 10 is made to function in a high temperature zone, the gas refrigerant separated in the gas-liquid separator 4 is inhibited from being introduced into the intermediate pressure portion of the compressor 1 is inhibited, or allowed to be introduced into another intermediate pressure portion which is lower in pressure than the intermediate pressure portion.

Abstract: A refrigerating machine comprising a compressor, a radiator, a pressure-reducing device, a gas-liquid separator, plural heat absorbers functioning selectively in different temperature zones, a unit for allowing introduction of gas refrigerant separated in the gas-liquid separator into an intermediate pressure portion of the compressor, and a low pressure side circuit in which liquid refrigerant separated in the gas-liquid separator is circulated, wherein the low pressure side circuit is provided with at least a heat absorber functioning in a low temperature zone.

Abstract: A refrigerating machine having a compressor, a radiator, a pressure-reducing device, a gas-liquid separator, a unit for selectively introducing gas refrigerant separated in the gas-liquid separator into an intermediate pressure portion of the compressor, and a low pressure side circuit in which liquid refrigerant separated in the gas-liquid separator is circulated. The low pressure side circuit is provided with a heat absorbing unit functioning selectively in one of different temperature zones, and refrigerant passing through the selected heat absorbing unit is returned to a suction portion of the compressor.

Abstract: In a heat pump type hot water supply apparatus having a compressor (16), an outdoor heat exchanger (22), an expansion valve (24) and at least one indoor heat exchangers, and a water heat exchanger (18) for heat-exchanging refrigerant and water to achieve hot water, the water heat exchanger (18) is equipped in the refrigerant circuit so as to be connected to the outdoor heat exchanger (22) in series in the refrigerant circuit.

Abstract: A safe having a good coefficient of performance is provided, and a refrigerating cycle and a refrigerating device in which the non-azeotropic refrigerant mixture is circulated are also provided. The non-azeotropic refrigerant mixture comprises a carbon dioxide and at least one kind of combustible refrigerants, and has a temperature glide. The refrigerating cycle, in which a compressor, a heat radiator, an expansion mechanism and an evaporator are connected by a refrigerant path, is characterized in that the above non-azeotropic refrigerant mixture is circuited in the refrigerating cycle. In addition, a refrigerating device comprises the above refrigerating cycle and a plurality of the evaporators, wherein an evaporator for use in a low temperature and an evaporator for use in a high temperature higher than the low temperature are arranged in series.