| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent lowering of COP of a refrigerant circuit in thermal storage in a thermal storage hot water supply apparatus using the refrigerant circuit performing a heat pump cycle operation as a heat source side part. <P>SOLUTION: Carbon dioxide is used as a refrigerant of the refrigerant circuit 2. A heat source side heat exchanger 25 performs heat exchange between the refrigerant of the refrigerant circuit 2 and water of a water circuit 20. A thermal storage means 3 of the water circuit 20 is provided with a high temperature side thermal storage material 62 for performing heat exchange with water of a high temperature side heat exchanger 63 and a low temperature side thermal storage material 66 formed of latent heat thermal storage material having a melting point lower than that of the high temperature side thermal storage material 62 for performing heat exchange with water of a low temperature side heat exchanger 67 connected in series to the high temperature side heat exchanger 63. The water circuit 20 is so constructed that at the time of thermal storage to a thermal storage means 3, water flows from the high temperature side heat exchanger 63 to the low temperature side heat exchanger 67, and water flowing out of the low temperature side heat exchanger 67 flows into the heat source side heat exchanger 25. <P>COPYRIGHT: (C)2003,JPO |
