摘要 |
<P>PROBLEM TO BE SOLVED: To provide a heat exchanger capable of improving COP of, for example, a heat pump unit, supercooling a high-pressure refrigerant, and improving the efficiency of, for example, the heat pump unit. <P>SOLUTION: The defrost heat exchanger 19 includes a low-pressure refrigerant pipe 20 in which a low-pressure refrigerant flows, a high-pressure refrigerant pipe 21 which is wound on the low-pressure refrigerant pipe 20 and in which a high-pressure refrigerant flows, and a water pipe 56 which is wound on the low-pressure refrigerant pipe 20 and in which the water flows. Thus, the low-pressure refrigerant absorbs the heat of the high-pressure refrigerant and the water, to increase its temperature. Meanwhile, heat of the high-pressure refrigerant and the water is absorbed by the low-pressure refrigerant, to lower their temperatures. <P>COPYRIGHT: (C)2010,JPO&INPIT |