| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a heat pump water heater reducing probability of running out of hot water, and improving convenience and efficiency, with respect to a water heater using a heat pump as a heat source. <P>SOLUTION: In this heat pump water heater comprising a refrigerant circuit 10 including a compressor 11, a radiator 12, a pressure reducing means 13, and an evaporator 14 comprising an air supply means 15, a heat exchanger 16 comprising a water flow channel 17 exchanging the heat with the radiator 12, a hot water storing tank 21, and a water supply pipe 18, and supplying the hot water by mixing the water from the heat exchanger 16, the water from the hot water storing tank 21 and the water from the water supply pipe 18, a control means 42 is mounted for controlling a compression ratio of the compressor 11 so that it is not lowered less than a prescribed compression ratio, when the hot water from the heat exchanger 16 heated by the refrigerant circuit 10 is used in hot water supply, thus the compression ratio of the compressor 11 is not lowered less than the prescribed compression ratio, the running-out of hot water can be prevented, and the operation efficiency can be improved. <P>COPYRIGHT: (C)2007,JPO&INPIT |
