翅片管换热器的距离与片高主要是影响着翅化比，翅化比和管内外介质的膜传热系数有很大的联系。假如管内外膜传热系数差异较大，应挑选翅化比比较大的翅片管。当一侧介质存在相变的情况下，传热系数的差异会较大。翅片的片距主要是考虑积灰，结尘，清洗等因素，同时需严格符合设备对压力降等要求。摆放时，管与管之间的距离不易过大，一般＞1mm以上适合布管就行。在换热的过程中，空气在流经翅片管换热器时，主要是翅片正反二个面参与换热。二支翅片管中心部位只要少量的辐射传热，换热作用不好。在空气加热的过程中，未经换热的冷空气会与从翅片中心穿过的已加热热空气构成中和，反而影响了换热的作用。

The distance and height of fin and tube heat exchanger mainly affect the fin ratio, which is closely related to the film heat transfer coefficient of the medium inside and outside the tube. If there is a big difference in the heat transfer coefficient between the inner and outer film of the tube, the finned tube with larger fin ratio should be selected. When one side of the medium has phase change, the difference of heat transfer coefficient will be larger. The fin spacing mainly considers the factors such as dust deposition, dust deposition and cleaning, and strictly meets the requirements of equipment for pressure drop. When placing, the distance between pipes is not easy to be too large, generally more than 1 mm is suitable for pipe laying. In the process of heat transfer, when the air flows through the finned tube heat exchanger, the positive and negative surfaces of the fins participate in the heat transfer. Only a small amount of radiation heat transfer is needed in the center of two finned tubes, so the heat transfer effect is not good. In the process of air heating, the cold air without heat exchange will be neutralized with the heated air passing through the center of fin, which will affect the heat transfer effect.

翅片管换热器的管摆放应尽量按正三角形穿插摆放。通过一排时的热风，在第二排遭受阻力，有回弹风，这样整个翅片管360°换热就不存在死角的现象。所以，不要等腰三角形摆放，尽量不使用正方形摆放。

The tubes of finned tube heat exchanger should be placed alternately according to regular triangle as far as possible. When the second row of fins is not subjected to rebound, there is a phenomenon of no heat transfer in the second row of fins. Therefore, do not place isosceles triangle, try not to use square.

空气侧的压降在规划中是个很重要的参数，这和翅片管的摆放有很大的联系，翅片管摆放规划时应核算窄隙流转面与迎风面的比值，从而依据迎面风速核算出空气质量流速，在关于不同温度空气的动力黏度，求出摩擦系数。

The pressure drop on the air side is a very important parameter in the planning, which is closely related to the placement of finned tubes. When planning the placement of finned tubes, the ratio of narrow gap flow surface to windward surface should be calculated, so as to calculate the air mass velocity according to the frontal wind speed, and calculate the friction coefficient with respect to the dynamic viscosity of air at different temperatures.