| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a heat pump hot water heater that has high defrosting capacity and can achieve highly efficient defrosting operation using stored heat. <P>SOLUTION: A heat pump hot water heater includes a heat pump cycle having a compressor 1, a water-refrigerant heat exchanger 2, a pressure reducer 3, and an air heat exchanger 4 connected in sequence, and a hot water circuit having the water-refrigerant heat exchanger 2, a hot water circulating means 13, an opening and closing means 24, and a bypass circuit 23 for bypassing the water-refrigerant heat exchanger 2. During transition from a normal heating operation to a defrosting operation, operation of the heat pump cycle is continued, and the opening and closing means 24 is opened and heat storage operation is performed for circulating hot water between the bypass circuit 23 and the water-refrigerant heat exchanger 2. <P>COPYRIGHT: (C)2013,JPO&INPIT |
