Abstract: A heat pump system using waste heat has a compression heat pump circuit that uses the shaft output of a power engine as a power source for a compressor for compressing refrigerant, and an absorption heat pump circuit using waste heat of the power engine as a heat source for a regenerator for heating absorbing liquid, refrigerant vaporized in the compression heat pump circuit is circulated to an absorber of the absorption heat pump circuit, the refrigerant is separated after regenerated by the regenerator, and the separated refrigerant is circulated in the compression heats pump circuit. The absorption heat pump circuit has a reverse pump R in a return pipe for absorbing liquid from the regenerator to the absorber, and the rotation energy of the reverse pump R can be withdrawn by a circulation pump P for the absorbing liquid.

Abstract: A heat pump system using waste heat has a compression heat pump circuit that uses the shaft output of a power engine as a power source for a compressor for compressing refrigerant, and an absorption heat pump circuit using waste heat of the power engine as a heat source for a regenerator for heating absorbing liquid, refrigerant vaporized in the compression heat pump circuit is circulated to an absorber of the absorption heat pump circuit, the refrigerant is separated after regenerated by the regenerator, and the separated refrigerant is circulated in the compression heats pump circuit. The absorption heat pump circuit has a reverse pump R in a return pipe for absorbing liquid from the regenerator to the absorber, and the rotation energy of the reverse pump R can be withdrawn by a circulation pump P for the absorbing liquid.

Abstract: An object is to provide a heating tank capable of highly efficiently heating a target to be heated and having high safety and reliability, and a hot water storage tank. The heating tank in which the target to be heated is stored and which heats the target to be heated by a circulated refrigerant of a heat pump, for example, the hot water storage tank which is heated by the circulated refrigerant of the heat pump to produce hot water in the tank includes a heat exchanger in which a wall surface of a tank main body is partially secured to peripheral edge portions and inner portions of two metal plates and in which non-secured portions swell to constitute a refrigerant passage closed except an inlet and an outlet. A thickness dimension of one metal plate is set to be larger than that of the other metal plate, and the one metal plate is arranged on the inner side of the other metal plate.

Abstract: There is disclosed a heat exchanger capable of suppressing the increase of a pressure drop while improving a non-uniform rate distribution of a fluid. A heat exchanger T of the present invention is constituted of flat plates 1, 2 each having an inflow port 15 of the fluid on one end thereof and an outflow port 16 of the fluid on the other end, and offset type fins 5 provided in the flat plates 1, 2, and includes a fin orthogonal region H where the plate fins 5 cross the flow direction of the fluid from the inflow port 15 to the outflow port 16 at right angles and a fin parallel region V where the plate fins 5 are disposed in parallel with the flow direction of the fluid from the inflow port 15 to the outflow port 16, the fin orthogonal regions H are provided on the sides of the inflow port 15 and the outflow port 16, and the fin parallel region V is provided between the respective fin orthogonal regions H.

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: A refrigerating machine equipped with a compressor has an intermediate-pressure portion in which refrigerant having intermediate pressure higher than the pressure of the refrigerant at the suction side of the compressor and lower than the pressure of the refrigerant at the discharge side of the compressor is allowed to be introduced, and a heat exchange circuit formed between a heat-source side heat exchanger and a using side heat exchanger. The heat exchange circuit branches the refrigerant flowing from any one of the heat exchangers to the other heat exchanger, carries out heat exchange between one branched refrigerant and the other branched refrigerant or the refrigerant before the branching so that the one branched refrigerant is set to gas-phase refrigerant, and the gas-phase refrigerant thus achieved is led to any one of the intermediate-pressure portion and refrigerant suction pipe of the compressor.

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: To minimize the heat energy required for supplying dry air. A dry air-supplying apparatus 1 comprises a dry air-supplying air path 6 for supplying air from the surroundings that has been heated as dry air and a discharge air path 7 for discharging the moist air to the surroundings after the drying operation by the supplied dry air. Thus, the dry air-supplying air path draws in surrounding air and provides heat-exchanges by a heat exchanger 13 with the air in the discharge air path, this heat-exchanged air is heated by a radiator 14 and is supplied as dry air; while the discharge air path provides heat-exchanges, by the heat exchanger, the moist air after the drying operation with the air in the dry air-supplying air path, cools and dehumidifies the air that has been heat-exchanged by a cooler, and discharges it.

Abstract: An object is to provide a heating tank capable of highly efficiently heating a target to be heated and having high safety and reliability, and a hot water storage tank. The heating tank in which the target to be heated is stored and which heats the target to be heated by a circulated refrigerant of a heat pump, for example, the hot water storage tank which is heated by the circulated refrigerant of the heat pump to produce hot water in the tank includes a heat exchanger in which a wall surface of a tank main body is partially secured to peripheral edge portions and inner portions of two metal plates and in which non-secured portions swell to constitute a refrigerant passage closed except an inlet and an outlet. A thickness dimension of one metal plate is set to be larger than that of the other metal plate, and the one metal plate is arranged on the inner side of the other metal plate.

Abstract: In the case that heat absorbing means that function in selectively different temperature ranges, are provided in a refrigerating cycle, an object is to provide a refrigerating apparatus capable of suppressing the deterioration of efficiency in either temperature range to make a highly efficient operation possible. The refrigerating apparatus includes a compressor, a radiator, first heat absorbing means, and second heat absorbing means provided in parallel with the first heat absorbing means. The first heat absorbing means includes first decompressing means, a first heat absorber, and a first heat exchanger capable of heat exchange between a refrigerant which has come from the first heat absorber and a refrigerant flowing in the first decompressing means.

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: 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: An object is to improve a pressure resistance and a thermal performance of a heat exchanger and to provide the heat exchanger suitable for use in a refrigeration cycle device in which carbon dioxide is used as a refrigerant. The evaporator (the heat exchanger) includes a pair of plate materials, the whole periphery of a peripheral portion of an outer plate as at least one of the plate materials is secured to the other plate material constituting a bottom surface of an inner tank to constitute a sealed refrigerant passage space between the plate materials, a portion of the outer plate other than the peripheral portion is provided with a plurality of secured inner portions which are secured at predetermined intervals to the bottom surface, and a plurality of refrigerant inlet tubes and refrigerant outlet tubes are attached so as to communicate with the refrigerant passage space.

Abstract: In a refrigeration cycle device in which heat generated by heat absorption of an evaporator is used for heating in a condenser, a disadvantage that a cooling capacity of the evaporator deteriorates owing to shortage or drop of an amount of the heat to be rejected from the condenser is securely avoided and a cooling function is maintained. In the refrigeration cycle device which is provided with a refrigerant circuit including a compressor, a condenser, an expansion valve and an evaporator and which exhibits a heating function by the heat rejected from the condenser and which exhibits the cooling function by the heat absorption of the evaporator, an operation to secure a predetermined amount of the heat to be rejected from the condenser is executed in order to maintain the cooling function of the evaporator based on an index capable of grasping the amount of the heat to be rejected from the condenser.

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 equipped with a compressor 2 having an intermediate-pressure portion 2M in which refrigerant having intermediate pressure higher than the pressure of the refrigerant at the suction side thereof and lower than the pressure of the refrigerant at the discharge side thereof can be introduced, and an intermediate-pressure receiver 28 that is inserted in a flow path between an expansion valve 27a (27b) of a heat source side heat exchanger 3a (3b) and an expansion valve 18a (18b) of a using side heat exchanger 6a (6b), carries out gas-liquid separation on gas-liquid mixed refrigerant after the heat exchange in the heat source side heat exchanger or the using side heat exchanger, and then feeds gas-phase refrigerant to the intermediate-pressure portion 2M.

Abstract: There is disclosed a highly efficient cooling device which can reduce energy consumption, and the cooling device comprises: a refrigeration cycle circuit including a compressor, a radiator, an expansion valve and an evaporator; a cooling container in which a cooling object is stored; and a hot water storage tank which stores hot water. Moreover, the cooling object in the cooling container is cooled by absorption of heat in the evaporator, water is boiled by release of the heat in the radiator to store the hot water in the hot water storage tank, and the hot water in the hot water storage tank can be supplied into the cooling container.

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: It is an object of the present invention to provide a refrigerator which is able to improve the efficiency of the refrigerating cycle while avoiding causing the structure of the refrigerator to be complicated, and avoiding a cost increase. Refrigerator 30 includes a refrigerating cycle device 20 having a compressor 1, a radiator 2 connected to a discharge side of the compressor 1, a first expansion valve 31 connected to an exit side of the radiator 2, a gas-liquid separator 33 for separating a refrigerant, which is in a mixed gas-liquid state by being decompressed by the first expansion valve 31, into a gas refrigerant and a liquid refrigerant, a heat absorber 14 into which the liquid refrigerant discharged from the gas-liquid separator 33 flows, and a refrigerant pipe 6D for delivering the gas refrigerant discharged from the gas-liquid separator 33 into the middle pressure portion of the compressor 1; an outer case 40; an inner case 39; and a heat insulating material.

Abstract: An object is to provide a refrigerating device capable of realizing a high-efficiency operation in a case where a compressor having an intermediate pressure section is applied, and a refrigerator including this refrigerating device. A refrigerating device 30 includes: a compressor 1; a radiator 2; an expansion valve 3; a gas-liquid separator 4; and a heat absorbing unit 8 through which a liquid refrigerant discharged from this gas-liquid separator circulates. The refrigerating device further includes: a refrigerant pipe in which the refrigerant discharged from the heat absorbing unit 8 can be introduced into a suction port of the compressor 1 and which introduces a gas refrigerant separated by the gas-liquid separator 4 into the intermediate pressure section of the compressor 1; and a refrigerant pipe which introduces an intermediate-pressure refrigerant of the compressor 1 into the gas-liquid separator 4.