| 摘要 |
PURPOSE:To improve the heat exchanging rate by bending a part of pipes which are routed through fins such that the fin pitch in the curved part is made greater than that of the straight part. CONSTITUTION:By making the inner fin pitch fp13 of a curved part A of a heat exchanger 11 nearly equal to the fin pitch fp12 of the straight part, the draft resistance of the straight part becomes nearly equal to the draft resistance of the curved part. Because of this, the air can easily flow through the curved part A, and the curved part A can be effectively utilized as a heat generating surface to improve the heat exchanging rate.
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