Which parameters of finned tube have influence on heat dissipation

September 27, 2022

1. The fin height is increased, which will also improve the heat removal range, thereby increasing the heat dissipation. However, this cannot be improved blindly, and the rationalization of overall dimensions should also be considered. 2. Fin spacing If the fin spacing is reduced, the heat dissipation will be increased, but it is not the smaller the better. If the spacing is too small, it will cause negative effects. Therefore, most of the two pipes are 3-4 mm, four pipes are 4-5mm, and six pipes are 5-6mm. 3. If the diameter of the fin and tube is increased, the heat dissipation will be increased, but it will also have some disadvantages. If the fin height is not very large and the fin pitch is very small, then the pipe diameter should also consider rationalization. 4. The number of fins increases. Although it can also improve the heat dissipation, it will also increase the cost. Therefore, it is not very economical from the economic perspective.

When the total heat conduction area of Fin Tube and fin is doubled, its heat transfer coefficient will not be doubled, but will be discounted, usually (0.9-0.7). This shows that the more fins, the lower the working efficiency of fins, and the economy of improving fins will be greatly reduced. If the fins are too high and too dense, it will also increase the difficulty coefficient of processing technology and increase the processing cost.

If the fins are too high and dense, it is easy to cause ash accumulation problem, and it is difficult to clean the ash. Therefore, the number of Finned Tubes to be selected depends on the calculation of finning ratio, that is, the ratio of the total heat transfer area after the fins are lifted divided by the total area when the fins are not lifted. According to the normal regulations, it is generally believed that the fin to fin ratio is about 5 to 10, so we must make a reasonable choice when choosing finned tubes. It is also very reasonable that things will turn against each other when they reach the extreme.

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