| 摘要 |
PURPOSE:To provide a fin which is highly resistant against clogging with frost by a method wherein a slit having a flat top part is arranged at a height which is approximately coincided with a downstream fin where it is an air upstream side from a front edge of a short fin at an extremity end of a long fin. CONSTITUTION:Hot flowing air having a plenty of water vapor is cooled a little at an extremity end of a long fin 1a, changed into a condensed water or frost and leaves water vapor. Air flowing into an intermeditate part between long fins la is cooled a little by extremity end slits 3, changed into condensed water or frost and leaves water vapor. Then, the air is reached to the extremity end of the short fins 1b. The extremity ends of the short fins 1b have a little lower temperature than that of the extremity ends of the long fins 1a or the extremity end slits 3. So, in this area, some of the water vapor contained in the air are changed into frost and left on the surfaces of the fins. However, the water vapor is reduced a little, so that an amount of frost adhered to the extremity ends of the short fins 1b is reduced as compared with the case that the extremity end slits 3 are not present.
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