| 摘要 |
Each fin (30) is formed in the following way: a continuous line of ridges (34) and troughs (36) lies within the range of 10 to 60 degrees relative to the main flow of an air and is symmetrically folded at folding lines provided at folding intervals W along the main flow of the air, the ratio (a/p) between the amplitude a and fin pitch p of the waveform formed by the ridges (34) and the troughs (36) is 1.3 x Re-0.5 < a/p < 0.2, the ratio (W/z) between the folding interval W and the wavelength z of the waveform is 0.25 < W/z < 2.0, the ratio (r/z) of the curvature radius r of the top of each (34) and the bottom of each trough (36), and the wavelength z of the waveform is 0.25 < r/z, and the inclination angle α of a cross-section of the waveform is 25° or greater. The construction makes the heat transfer coefficient of the heat exchanger excellent, so that the heat exchanger can be reduced in size.
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