| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a refrigerant circuit capable of introducing water to a water heat exchanger after a water temperature is surely lowered by a sub-heat exchanger even if an outside air temperature is high, and surely lowering the water temperature by the sub-heat exchanger in the refrigerant circuit operated by supercritical pressure, in the refrigerant circuit for producing hot water by the water heat exchanger. <P>SOLUTION: In this refrigerant circuit constituted by successively connecting a compressor, the water heat exchanger, a pressure reducing mechanism and an air heat exchanger, operated by supercritical pressure at a high pressure side, and introducing the water of which the heat is collected at a low pressure side to the water heat exchanger to heat the water, the sub-heat exchanger for collecting the heat at the low pressure side is disposed at the upstream side of the air heat exchanger and the downstream side of the pressure reducing mechanism. <P>COPYRIGHT: (C)2008,JPO&INPIT |
