| 主权项 |
1. A heat pump water heating system comprising:
a first circulation circuit including a first heat source and a first circulation pump; a second circulation circuit including a second heat source having a higher temperature than the first heat source, and a second circulation pump; a third circulation circuit including a mixing tank that connects the first circulation circuit and the second circulation circuit, and a third circulation pump; a fourth circulation circuit including a hot water storage tank that stores tank water, and a fourth circulation pump; a heat exchanger that exchanges heat between water flowing through the third circulation circuit, and the tank water flowing through the fourth circulation circuit; a temperature sensor that detects a temperature of the tank water within the hot water storage tank; and a controller that controls the first circulation pump, the second circulation pump, the third circulation pump, and the fourth circulation pump, wherein if the temperature of the tank water detected from the temperature sensor is lower than a first preset temperature, the controller drives the first circulation pump, the third circulation pump, and the fourth circulation pump, and uses the first heat source to increase the temperature of the tank water within the hot water storage tank via the heat exchanger, and if the temperature of the tank water detected from the temperature sensor is equal to or higher than the first preset temperature, the controller stops the first circulation pump, drives the second circulation pump, the third circulation pump, and the fourth circulation pump, and uses the second heat source to increase the temperature of the tank water within the hot water storage tank via the heat exchanger in a shorter time than that of a case in which the first heat source is used to increase the temperature. |
