HEAT EXCHANGER AND METHOD FOR MANUFACTURING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a heat exchanger capable of suppressing blockage of a passage in which fluid to be heat-exchanged is allowed to flow.SOLUTION: A heat exchanger 10 is configured by alternately laminating water pipes 20 in which first fluid is allowed to flow and refrigerant pipes 40 in which second fluid is allowed to flow to perform heat exchange between the first fluid and the second fluid. Each of the water pipes 20 includes a pair of water passage surfaces 22, a plurality of water passage surface projections 23 and butt dimples 24. The water passage surfaces 22 are joined to the refrigerant pipes 40. The water passage surface projections 23 are formed on the water passage surfaces 22 and projected to the refrigerant pipes 40. The butt dimples 24 are formed on the water passage surfaces 22 to partially connect the pair of water passage surfaces 22. The butt dimples 24 are arranged in the vicinity of the water passage surface projections 23.