| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat exchanger which has a heat exchanger applicable flattened refrigerant pipe and a heat exchanger applicable fins that are joined together by brazing, and drains dew condensation water generated in the heat exchanger to suppress increase of air flow resistance and progress of corrosion which can be caused by remaining of the dew condensation water.SOLUTION: On a heat transfer surface of a heat exchanger, metal oxide having a density greater than that of brazing filler metal is added to a brazing filler metal layer and brazing is performed, thereby providing a heat exchanger with a density gradient region in which the density of the metal oxide increases toward the downstream of air flow in operation of an air conditioner. |
