| 摘要 |
PURPOSE:To improve water wettability of fins and enhance heat-exchanging efficiency, by a method wherein an appropriate heating step is provided in the production process, and a plurality of crater parts which can be formed by heating are formed at the surfaces of the fins. CONSTITUTION:The fins are formed by press working, and then the crater parts are formed at the surfaces of the fins by appropriate heating. Alternatively, plate form aluminum fins and a pipe are fixed to each other by enlarging the pipe or other method, and then the crater parts are formed at the surfaces of the fins by providing an appropriate heating step. An Fe component contained in the fin material has an effect on the formation of the crater parts. The component for forming the crater parts at the surfaces of the fins is not limited to the Fe component but may be any one which can form the crater parts at the surfaces of the fins when being heated, and the heating temperature is not limited either. |
