| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a heat pump water heater capable of improving operation efficiency as the entire heat pump water heater. <P>SOLUTION: The heat pump water heater includes: a heat pump refrigerant circuit constituted by interconnecting at least a compressor 1, a refrigerant side heat transfer pipe 2a of a high-temperature side liquid refrigerant heat exchanger 2, a refrigerant side heat transfer pipe 3a of a low-temperature side liquid refrigerant heat exchanger 3, a decompression device 4 and an air heat exchanger 5 by refrigerant piping; a heated liquid circuit constituted by interconnecting at least a pump 15, a liquid side heat transfer pipe 3a of the low-temperature side liquid refrigerant heat exchanger 3 and a liquid side heat transfer pipe 2b of the high-temperature side liquid refrigerant heat exchanger 2 by liquid piping; and an operation control means 50. The heated liquid circuit includes a liquid bypass circuit 17 arranged in parallel with the liquid side heat transfer pipe 3a, and the operation control means 50 controls a switching means 16 switching a flow passage between the liquid side heat transfer pipe 3a and the liquid bypass circuit 17. <P>COPYRIGHT: (C)2011,JPO&INPIT |
