| 摘要 |
PROBLEM TO BE SOLVED: To provide a hot water storage type heat pump hot-water supplier that is improved in operational efficiency and is contrived to effectively utilize the hot-water capacity of a hot-water storage tank. SOLUTION: This heat pump hot-water supplier is provided with a flow rate control means 10 which controls a flow regulating valve 11 for fixing a boiling temperature which is the temperature of water at the water-side outlet of a refrigerant-water heat exchanger 2, a detecting means 13 which detects the completion of the boiling of all hot water stored in the hot-water storage tank 5 just before the completion, and a control means 12 which changes the valve travel of the valve of a pressure reducing device 3 when the signal from the detecting means 13 becomes a prescribed one. Since the valve travel of the valve of the pressure reducing device 3 is changed when the boiling of the hot water is near completion and the discharge pressure of a compressor 1 rises, this hot-water supplier can be operated for heating hot water to a high feed water temperature. Consequently, the supplier can effectively utilize the hot-water capacity of the tank 5 and, in addition, can be operated highly efficiently for heating hot water. |
