| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat pump type heating device capable of adjusting a circulation flow rate of a heating medium while maintaining a feeding pressure of the heating medium to a heating terminal at a value equal to or greater than a predetermine value.SOLUTION: A heat pump type heating device includes: a low order-side refrigerant circuit 10 in which a refrigerant circulates in a compressor 12, a heating medium/refrigerant heat exchanger 13, a cascade heat exchanger 14, an expansion valve 15 and an evaporator 16 in this order; a high order-side refrigerant circuit 20 in which the refrigerant circulates in a compressor 22, a heating medium/refrigerant heat exchanger 23, an expansion valve 24, the cascade heat exchanger 14 in this order; a heating medium circuit 30 which has a flow rate control valve 34 on a heating medium outlet side and a heating medium pump 33 on a heating medium inlet side of a heating terminal 31, and which is configured so as to allow a return heating medium which has passed the flow rate control valve 34 to pass through the low order-side heating medium/refrigerant heat exchanger 13 and/or the high order-side heating medium/refrigerant heat exchanger 23, and then, to send it out to the heating terminal 31 by the heating medium pump 33; and a control unit 40 which controls the heating medium pump 33 and the flow rate control valve 34. |
