| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat pump hot water supply system that can determine defrosting from the side of a hot water storage tank unit and improve frosting determination precision for an evaporation heat exchange.SOLUTION: A heat pump hot water supply system 1 includes a hot water storage tank unit 2, a heat pump unit 3, and a hot water circulation circuit 4 which connects the hot water storage tank unit 2 and heat pump unit 3 to each other, is provided with a circulation pump 13 of the hot water circulation circuit 4 for circulating hot water and water on the side of the hot water tank unit 2, and includes a main control unit 15 (frosting determination means) configured to adjust a stored hot water temperature by adjusting a flow rate of the circulation pump 13, and determining a frosting state of an evaporation heat exchange 24 included in the heat pump unit 3 on the basis of a driving time of the circulation pump 13 in a hot water supply operation.SELECTED DRAWING: Figure 2 |
