| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem of a conventional structure requiring a long defrosting operation time since the defrosting operation is performed using decompressed refrigerant. SOLUTION: In this heat pump device comprising a high-pressure side defrosting circuit 16 bypassing a heat radiating heat exchanger 12 and decompressing means 13, and a defrosting circuit opening/closing valve 17 for opening/closing the high-pressure side defrosting circuit 16 to a refrigerant circuit including a compressor 11, the heat radiating heat exchanger 12, the decompressing means 13 and an atmospheric heat exchanger 14, frost on the atmospheric heat exchanger 14 can be melted in a short time using the high temperature refrigerant. Thereby, the easiness-of-use for a user is improved since it is not necessary to stop operations of hot water supply or heating for a long time. COPYRIGHT: (C)2005,JPO&NCIPI
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