| 摘要 |
PROBLEM TO BE SOLVED: To suppress degradation in efficiency of a heat pump unit without interposing a large-sized recovery tank in a heating medium heating circuit in a heat pump type heater including a tank water heating circuit 3 for circulating tank water from the bottom to the top of a hot water storage tank 1 via a radiator 23 of the heat pump unit 2, a liquid-liquid heat exchanger 41 interposed in a return conduit 4a of a heating circuit 4, and the heating medium heating circuit 5 for circulating the tank water from the top to the bottom of the hot water storage tank via the liquid-liquid heat exchanger. SOLUTION: A tank water circulation amount of the heating medium heating circuit 5 is feedback controlled so that the temperature of a heating medium supplied to a heating terminal becomes a prescribed set temperature. When the temperature of the tank water after passing the liquid-liquid heat exchanger 41 exceeds a prescribed upper limit temperature, restriction control is performed for restricting the tank water circulation amount so that the temperature of the tank water does not exceed the upper limit temperature. COPYRIGHT: (C)2011,JPO&INPIT |
