| 摘要 |
PURPOSE:To improve heat transfer rate remarkably by a method wherein the title heat exchanger is constituted of a multitude of sheet type fins, arranged in parallel with a given space and between which air flows, and heat transfer tubes, penetrated through the sheet type fins orthogonally to the same and through which fluid flows. CONSTITUTION:Heat transfer tubes 13 having the outer diameter of D0 are penetrated through sheet type fins 11 with a tube row pitch L1 (1.2D0<=L1<=1.8D0) in parallel to the direction of airflow B and with a tube stage pitch L2 (2.6D0<=L2<=3.3D0) orthogonal to the direction of airflow B. According to this constitution, the arrangement of the heat transfer tube, in which air side heat performance is improved the most with respect to the same power base of a fan, may be realized. On the other hand, cut-and-raised parts 14a-14b are provided from the center of the sheet type fin 11 toward the end of the same up-and-down alternately so as to pinch the base sheet of the sheet type fin 11 while increasing the number of the cut-and-raised parts from one set to three sets sequentially whereby many of the leg parts 15a-15c of the cut-and- raised parts 14a-14c are arranged, a distance from a leading edge is elongated, an average heat transfer distance from the fore end or the aft end of the heat transfer tube 13 is shortened and fin efficiency may be improved.
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