| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a heat exchanger that shows high corrosion resistance under a water service environment, and is inexpensive and lightweight as compared with a heat exchanger having an inner pipe and an outer pipe both composed of only Cu metal. <P>SOLUTION: The heat exchanger includes: a first heat transfer tube 20 serving as an outer pipe where water flows, and a second heat transfer tube 30 disposed inside the first heat transfer tube 20 and serving as an inner tube where a refrigerant flows. The heat exchanger is a double tube type heat exchanger that exchanges heat between the water and the refrigerant. The double tube type heat exchanger is configured such that at least one of the first heat transfer tube 20 and the second heat transfer tube 30 is Al metal tube 21, 31 whose base material is composed of Al metal, and Cu metal layers 22, 32 are formed on the whole surface which is to be in contact with water. <P>COPYRIGHT: (C)2012,JPO&INPIT |
