ENGINE DRIVEN HEAT PUMP CHILLER

摘要

PROBLEM TO BE SOLVED: To provide a heat pump chiller in which the heat exchange amount of a water heat exchanger during cold water operation can be set to be smaller than the capability which is settled on the basis of the lowest allowable number of revolutions of a compressor.SOLUTION: A heat pump chiller 100 includes: an air heat exchanger 3; a water heat exchanger 4; an operation changeover mechanism (2) for change over between cold water operation and hot water operation; engine exhaust heat recovery unit 5; a second expansion valve 7 for adjusting the flow rate of liquid-state cooling medium being delivered to the engine exhaust heat recovery unit 5; a flowing direction control mechanism 8 on the downstream side of the cooling medium inflow part of which a first expansion valve 6 and the second expansion valve 7 are arranged in parallel; a flow rate adjusting valve (33) for adjusting the flow rate of exhaust heat medium flowing in the engine exhaust heat recovery unit 5; and a control device 50 for opening the second expansion valve 7 and the flow rate adjusting valve (33) so that the cooling medium and the exhaust heat medium flow in the engine exhaust heat recovery unit 5 when a target value for the heat exchange amount of the water heat exchanger 4 is set to be a predetermined value or smaller during the cold water operation.