| 摘要 |
<p>On a fin (6), a rib (15) extending substantially parallel to an external edge (25) of the fin (6) is formed, and through holes (22) for penetrating a heat exchanger tube are arranged zigzag. When the inner diameter of the through holes (22) is D[mm], a distance between the center of the through hole (22) and the external edge (25) is L[mm], a distance between the center of the rib (15) and the external edge (25) is La[mm], the width of the rib (15) is LL1[mm], the plate thickness of the fin (6) is t[mm], the height of the rib (15) is h1[mm], and the minimum value of a distance between the through holes (22) is P[mm], the through holes (22) and the rib (15) satisfying the following inequalities are formed; 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, 15<P and D/P<0.5.</p> |
