| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve such a problem that for a water-refrigerant heat exchanger having a small diameter tube outside a large channel that pitting corrosion tends to occur at a part increased temperature, and corrosion originating the inside of the large channel therefore advances to the small diameter tube via a brazing part to cause a refrigerant and a refrigerator lubricant to spout to water in a large diameter tube. <P>SOLUTION: The water-refrigerant heat exchanger includes a middle diameter tube outside the small diameter tube, and detects water leakage by water leaking from an opening at an end or an opening in the middle part of the middle diameter tube. The middle diameter tube is made thinner than the thickness of the large diameter tube, and the water-refrigerant heat exchanger is thereby reduced in weight and streamlined. <P>COPYRIGHT: (C)2013,JPO&INPIT |
