| 摘要 |
PROBLEM TO BE SOLVED: To provide an operation for efficiently removing frost attached to evaporators by using the plurality of evaporators in a heat pump type heating device. SOLUTION: In this heat pump type heating device comprising a compressor 2 for compressing a refrigerant, a radiator 3 allowing the refrigerant compressed by the compressor 2 to exchange heat with a non-heating fluid, an expansion valve 4 for reducing a pressure of the refrigerant discharged from the radiator 3, and the first evaporator 5 and the second evaporator 7 for evaporating the refrigerant after pressure reduction by the expansion valve 4, a flow channel is switched so that the first and second evaporators 5, 7 are connected between the expansion valve 4 and the compressor 2 in seasons except for winter, and the first evaporator 5 is connected between the expansion valve 4 and the compressor 2, and the second evaporator 7 is connected between the compressor 2 and the expansion valve 4 in winter, and further the flow channel is switched so that the first evaporator 5 is connected between the compressor 2 and the expansion valve, and the second evaporator 7 is connected between the expansion valve 4 and the compressor 2 in defrosting the first evaporator 5, thus the heating operation can be efficiently performed without affected by a defrosting operation. COPYRIGHT: (C)2008,JPO&INPIT
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