换热管外径 d,mm |
19 |
25 |
翅化比 η |
2.8 |
2.5 |
2.2 |
2.0 |
1.7 |
2.8 |
2.75 |
2.5 |
2.2 |
1.8 |
1.6 |
换热管当量直径 de,mm |
17.5 |
17.8 |
23.5 |
换热管根部直径 dr,mm |
17 |
16.8 |
16.6 |
16.6 |
16.4 |
23 |
22.6 |
22.3 |
22.3 |
22 |
22 |
换热管内径 di,mm |
13.4 |
13.0 |
18.8 |
18.0 |
外内表面积 As/Ai |
3.6 |
3.3 |
3.1 |
2.7 |
2.3 |
3.6 |
3.5 |
3.3 |
3.0 |
2.2 |
2.2 |
齿顶圆直径 dof,mm |
18.8±0.2 |
24.8±0.2 |
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