换热器面积计算
换热管长度m2233
管板厚度m0.0820.0820.0820.082
换热管伸出管板长度m0.00150.00150.00150.0015
换热管根数根432607607432
换热管外径m0.0190.0190.0190.019
换热管内径m0.0150.0150.0150.015
换热管中径m0.0170.0170.0170.017
有效换热面积（外径）m247.2766.41102.6573.05
有效换热面积（内径）m237.3252.4381.0457.67
有效换热面积（中径）m242.2959.4291.8465.36