| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a heat pump system having a high coefficient of performance of mutually using respective characteristics of a refrigerant circuit becoming a supercritical cycle and an ordinary refrigerating circuit. <P>SOLUTION: This heat pump system 1 has a hot water supply heat pump 2 using a carbon dioxide refrigerant and having a first heat exchanger 7 and a second heat exchanger 9, and an air-conditioning heat pump 3 using a general refrigerant and having a third heat exchanger 25 and a fourth heat exchanger 27. In this system, when performing hot water supply and heating, a coefficient of performance of the hot water supply heat pump 2 is increased by lowering the temperature of hot water supplied to the first heat exchanger 7 by cooling lower layer side hot water of a hot water storage tank 4 by a fifth heat exchanger 41. At the same time, a coefficient of performance of the air-conditioning heat pump 3 is increased by supplying hot water heated by the fifth heat exchanger 41 to the fourth heat exchanger. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
