For each user, when using a finned tube heat exchanger, it is desirable to maximize its performance and bring higher value. So, how can we achieve the best performance of the finned tube heat exchanger? Start with the following aspects.
First of all, we must abide by the choice of finned tube heat exchanger materials, mainly the selection of finned tube materials, the influence of medium in the heat exchange tube on the heat transfer tubes, mainly focusing on corrosion, pressure, temperature, scaling, thermal conductivity, cost performance. . The requirements can meet the process requirements, without adverse consequences, good heat transfer performance and convenient material selection.
Secondly, it is necessary to reasonably set the fin tube spacing, sheet height and sheet thickness in the fin-and-tube heat exchanger. These three data are complementary and affect the direct wing ratio. The wing ratio is not as large as possible. It is necessary to calculate the difference of the convection coefficient inside and outside the tube. If the difference is large, the fin with high fin ratio can be used. If the difference is small, the fin with low wing ratio should be used. No difference is needed. Fin.
In addition, the sheet thickness has a very large relationship with the fin tube strength of the fin-and-tube heat exchanger. The main consideration is corrosion, friction loss, anti-washing and scouring ability, and has little effect on the heat exchange effect. Therefore, in the case of meeting certain strength requirements, the sheet thickness should be as thin as possible to reduce the consumption of non-ferrous metals, so as to design and manufacture a more economical fin-and-tube heat exchanger.
There is also the fin height of the finned tube heat exchanger. The heat transfer is from the root of the fin to the top. The closer to the root, the higher the temperature. As the heat is gradually replaced, the transfer temperature also decreases. Consider the temperature at the top of the fin is the lowest.
It can be seen that the temperature transfer is a certain gradient, that is to say, there is a problem of fin efficiency, and the higher the fin, the better. Of course, the structural arrangement of the finned tubes cannot be ignored, and it should be as reasonable as possible to meet the actual heat transfer requirements.