| 摘要 |
PURPOSE:To ensure an amount of air flow under such a condition that frost is generated and enable a cooling performance to be maintained by a method wherein plate fins are comprised of a plurality of fins arranged in a non-linear stepped configuration and each of the fin elements is partially connected to each other through connecting pieces. CONSTITUTION:A cooling unit 10 is comprised of plate fins 11 arranged in parallel to each other and coolant pipes 12 crossing at a right angle these plate fins 11. The plate fins 11 are comprised of a plurality of fin elements 11A and 11B arranged in a non-linear form with respect to a step direction and connecting pieces 13 for connecting these fin elements 11A and 11B, and a spacing capable of flowing air is arranged between these connecting pieces 13. Therefore, frost is concentrated at the connecting pieces 13 connecting the fin elements 11A and 11B having a high rate of thermal conduction, an adhering of frost at the end part of the air flow inlet port plate fins 11 is reduced and an air passage can be kept, so that an amount of air flow is not restricted and a cooling characteristic at the time of adhering of frost can be maintained.
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