| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat pump water heater capable of stabilizing a coefficient of performance without impairing the temperature of heated liquid discharged from a liquid refrigerant heat exchanger.SOLUTION: In the heat pump water heater, a control part calculates a target discharge temperature of a compressor (S2), and controls opening of a pressure reducer on the basis of the difference between a discharge temperature of the compressor detected by a temperature sensor and the target discharge temperature (S3). In addition, the control part calculates a target discharge pressure of the compressor (S2), and corrects the target discharge temperature on the basis of the difference between a discharge pressure of the compressor detected by a pressure sensor and the target discharge pressure (S5,S7,S8,S10,S2). |
