某立式蛇形翅片管换热器等效热力计算

Study on thermal calculation of vertical snake finned tube heat exchangers

某立式蛇形翅片管换热器的性能计算主要利用软件进行,但实际设计制造时由于制造原因和软件限制原因,实际布管与热力计算时软件的布管并不一致,实际布管根数为软件布管根数的2倍,这将很大程度上影响管内流体流速,从而影响管内传热系数。为了评估管内传热系数对总传热系数的影响,针对布管的不一致进行了热力计算的等效研究。结果表明,当管外传热系数远远小于管内传热系数时,管内传热系数对总传热系数的影响较小,可以直接利用软件计算结果进行换热器结构设计。希望通过这一实例的分享可对往后类似的工程项目提供参考。

The performance calculation of a vertical serpentine finned tube heat exchanger is mainly carried out using software.However,due to manufacturing reasons and software limitations during actual design and manufacturing,the actual pipe layout is not consistent with that of the thermal calculation software.The actual number of pipes arranged is twice the number of pipes arranged by the software,which will greatly affect the fluid flow rate inside the pipe and,thus,affect the heat transfer coefficient inside the pipe.In order to evaluate the influence of the heat transfer coefficient inside the pipe on the total heat transfer coefficient,an equivalent study of thermal calculation was conducted for the inconsistency in pipe layout.The results indicate that when the heat transfer coefficient outside the tube is much smaller than the heat transfer coefficient inside the tube,the influence of the heat transfer coefficient inside the tube on the total heat transfer coefficient is relatively small,and the software calculation results can be directly used for the structural design of the heat exchanger.Sharing this example can provide suggestions or guidance for similar engineering projects in the future.