| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a heat pump hot water supply apparatus with high energy efficiency. <P>SOLUTION: A refrigeration cycle is composed of a main refrigerant circuit 37 sequentially connecting a compressor 31, a hot water supply heat exchanger 32, an internal heat exchanger 36, a first throttle device 33, and an evaporator, and a bypass circuit 38 branched off from an outlet of the hot water supply heat exchanger 32, and connected to a suction piping 31a of the compressor 31 via a second throttle device 35 and the internal heat exchanger 36. It has a hot water supply circuit sequentially connecting a hot water storage tank 41, a circulating pump 42, and the hot water supply heat exchanger 32. The internal heat exchanger 36 carries out heat exchange of the refrigerant of the main refrigerant circuit 37 and the refrigerant of the bypass circuit 38, and it has a piping structure such that a Reynolds number of the refrigerant flowing through the internal heat exchanger 36 becomes 2300 or more. An outlet refrigerant of the hot water supply heat exchanger 32 is cooled by the internal heat exchanger 36 to increase an enthalpy difference of refrigerants of an inlet and an outlet of the evaporator 34, and a refrigerant circulation amount is reduced to reduce a pressure loss of the refrigerant of the evaporator 34. <P>COPYRIGHT: (C)2008,JPO&INPIT |
