COMPOSITE HEAT SOURCE HEAT PUMP DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a composite heat source heat pump device capable of acquiring a preferable heating feeling even during a defrosting operation.SOLUTION: A composite heat source heat pump device includes: a heating circulation circuit 30 having a heating circulation pump 32 for circulating a circulation liquid L in a heat radiation terminal 36; a first heat pump circuit 40 for heating the circulation liquid L via a first heating heat exchanger 41 disposed in the heating circulation circuit 30 by using underground heat; a second heat pump circuit 50 for heating the circulation liquid L via a second heating heat exchanger 51 disposed in the heating circulation circuit 30 by using air heat; and a control device 6. The composite heat source heat pump device performs a heating operation for heating the circulation liquid L by operating the second heat pump circuit 50 and by driving the heating circulation pump 32. The control device 6 performs a defrosting operation for melting frost attached to an air heat source heat exchanger 55 of the second heat pump circuit 50 as a first defrosting operation in which a flow passage is switched by a switching valve 58, and as a second defrosting operation in which the flow passage is not switched by the switching valve 58 and a discharge temperature of a second compressor 53 is increased, according to presence/absence of drive of the first heat pump circuit 40.SELECTED DRAWING: Figure 4