| 摘要 |
PROBLEM TO BE SOLVED: To reduce fin manufacturing cost in a duplex type heat exchanger having a plurality of types of fins having different fin heights and integrated. SOLUTION: Knurl stripes 141 are formed on a radiator fin 122 having a large short diameter size (thickness size) and a low height of a tube. Thus, since a buckling strength of the fin 122 becomes smaller than that of a condenser fin 112, when corrugated fins 140 are manufactured, even when a fin height H2 of the fin 122 and a fin height H2 of the fin 122 have the same size, in the case of assembling, when a load F is operated, the height H2 of the fin 122 can be easily reduced. Accordingly, since the fins 122 and 112 can be manufactured by the same molding roller 211, an increase in a facility investment for manufacturing the fin 140 can be suppressed. |
