| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a heat pump cycle capable of downsizing a heat exchanger even if it responds to a plurality of heat loads. <P>SOLUTION: In a heat pump system 1, a heat pump circuit 10 for circulating carbon dioxide coolant comprises a low-stage side compressor 21, a high-stage side compressor 25, an expansion valve 5, and an evaporator 4. A heating circuit 60 for circulating water as a heating heat medium comprises a radiator 61. A hot-water supply circuit 90 for circulating water for hot water supply comprises a hot-water storage tank 91. A high-pressure heat exchanger 50 carries out heat exchange among carbon dioxide coolant discharged from the high-stage side compressor 25, the heating heat medium, and the water for hot water supply. In the high-pressure heat exchanger 50, a part where the carbon dioxide coolant with the same enthalpy or the same temperature has an overlapping part which allows heat exchange with a part where the water for hot water supply passes as well as with a part where the heating heat medium passes. <P>COPYRIGHT: (C)2010,JPO&INPIT |
