| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat pump type heating hot water supply device capable of improving operation efficiency by effectively utilizing heat of a refrigerant flowing out from a hot water supply load.SOLUTION: When a heating operation and a boiling-up operation in a hot water storage tank 24 are simultaneously implemented by an indoor unit 21, warm water flowing into the indoor unit 21 is heated by operating a first heat pump circuit 10a, and heating water stored in the hot water storage tank 24 to a boiling-up temperature Tb by circulating refrigerant to a heat exchange portion 25 of the hot water storage tank 24 by operating a second heat pump circuit 10b. Then a temperature of hot water flowing into the indoor unit 21 is increased to a target hot water temperature Tt by exchanging heat between the refrigerant flowing out from the heat exchange portion 25 and the hot water flowing out from a water heat exchanger 2a by an auxiliary water heat exchanger 23. As it is unnecessary to increase the temperature of hot water flowing out from the water heat exchanger 2a to the target hot water temperature Tt, a capability exhibited in the first heat pump circuit 10a can be lowered. |
