| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a heat exchanger capable of improving heat exchange performance and improving operation efficiency of a heat pump water heater. <P>SOLUTION: This refrigerant-water heat exchanger 2 is composed of an outer pipe 10 and a plurality of inner pipes 11. Each inner pipe 11 is formed with a double structure of an inner pipe 11a constituting the outside thereof and an inner pipe 11b constituting the inside thereof; and leakage detection grooves 12 allowing passing of a fluid are formed on the inside surface of the inner pipe 11a constituting the outside out of them. Inner pipe surface projecting parts 12 and outer pipe surface projecting parts 13 are formed on the outside surface of each inner pipe 11 and on the inside surface of the outer pipe 10, respectively. Thereby, a contact area with water flowing between the inner pipes and the outer pipe 12 is increased, whereby heat exchange performance with the refrigerant flowing in the inner pipes 11 can be improved. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
