| 摘要 |
<p>A fin (6) is provided with a rib (15) extending generally parallel to an outer edge (25) of the fin (6) and insertion holes (22) placed in staggered arrangement for receiving heat exchange tubes. The insertion holes (22) and the rib (15) are formed such that when an inside diameter of the insertion holes (22) is set as D [mm], a distance between a center of the insertion hole (22) and the outer edge (25) is set as L [mm], a distance between a center of the rib (15) and the outer edge (25) is set as La [mm], a width of the rib (15) is set as LL1 [mm], a thickness of the fin (6) is set as t [mm], a height of the rib (15) is set as h1 [mm], and a minimum distance between the insertion holes is set as P [mm], then 0.4 < La < (L-D/2-0.5), 0.15 < LL1 < 0.5, 0.05 < t < 0.15, 0.5t < h1 < 2.5t, D < 7.5, P > 15, and D/P < 0.5.</p> |
