| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain a heat pump water heater mounted with a defrosting operation system, suppressing increase in the entire weight and capable of suppressing decline in performance caused by secular deterioration of a latent heat storage medium. <P>SOLUTION: A refrigerant circuit 100c of the heat pump water heater 100 includes a compressor 1, a four-way valve 2, a water heat exchanger 3, a heat storage heat transfer pipe 7 stored within a heat storage water tank 8, an expansion valve 4 and an air heat exchanger 5, and by sequentially interconnecting them, a refrigerating cycle is formed. A water circuit 100w of the heat pump water heater 100 includes water inlet piping 11 for supplying water to the water heat exchanger 3, a hot water storage tank 13 and water outlet piping 12 for communicating the water heat exchanger 3 with the hot water storage tank 13. Water is supplied to the heat storage water tank 8 via a heat storage water tank water supply pipe 14 branched from the water inlet piping 11 (by opening a heat storage water tank water supply on-off valve 15), and water within the heat storage water tank 8 can be discharged via a heat storage water tank water discharge pipe 22 (by opening a heat storage water tank water discharge on-off valve 23). <P>COPYRIGHT: (C)2010,JPO&INPIT |
