COMPOSITE HEAT SOURCE HEAT PUMP DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a composite heat source heat pump device which favorably performs heating 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 utilizing geothermal 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 utilizing air heat; and a control device 6. It performs a heating operation for heating the circulation liquid L by operating the second heat pump circuit 50 and driving a heating circulation pump 32. The control device 6 executes a defrosting operation for melting frost generated in an air heat source heat exchanger 55, detects the temperature of the circulation liquid going toward the heat radiation terminal 36 from the second heating heat exchanger 51 before starting defrosting, and controls rotational speed of a second compressor 53 at the defrosting time according to this temperature.SELECTED DRAWING: Figure 4