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: 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: 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: 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: A heat pump type hot water supply apparatus (10) for heating water by refrigerant heat and stocking the hot water thus achieved including: a heat pump unit (11) having a refrigerant circuit using natural refrigerant, the refrigerant circuit including a compressor (16) for compressing refrigerant, a heat-pump heat exchanger (18) and a refrigerant-water heat exchanger (27) for performing the heat exchange between refrigerant and water to achieve hot water; a hot water supply unit (12) including a hot water supply tank (26) for stocking the hot water achieved by the refrigerant-water heat exchanger (27) of the heat pump unit (11) and supplying the hot water thus stocked; and a water pipe (36) through which the refrigerant-water heat exchanger (27) of the heat pump unit (11) and the hot water supply tank (26) of the hot water supply unit (12) are connected to each other to circulate hot-water/water between the refrigerant-water heat exchanger (27) and said hot water supply tank (26).

Abstract: A heat pump type hot water supply apparatus (10) for heating water by refrigerant heat and stocking the hot water thus achieved including: a heat pump unit (11) having a refrigerant circuit using natural refrigerant, the refrigerant circuit including a compressor (16) for compressing refrigerant, a heat-pump heat exchanger (18) and a refrigerant-water heat exchanger (27) for performing the heat exchange between refrigerant and water to achieve hot water; a hot water supply unit (12) including a hot water supply tank (26) for stocking the hot water achieved by the refrigerant-water heat exchanger (27) of the heat pump unit (11) and supplying the hot water thus stocked; and a water pipe (36) through which the refrigerant-water heat exchanger (27) of the heat pump unit (11) and the hot water supply tank (26) of the hot water supply unit (12) are connected to each other to circulate hot-water/water between the refrigerant-water heat exchanger (27) and said hot water supply tank (26).