Is it better if the number of fins on a finned tube is more?

1. If the fins of a finned tube are too high and too dense, dust accumulation is likely to occur, and dust cleaning is difficult.

2. If the fins of a finned tube are too high and too dense, it will increase the difficulty of the process and the processing cost.

3. When the heat transfer area of the finned tube fin doubles, its heat transfer coefficient cannot double, but a discount is required, generally (0.9---0.7), and the higher the fin, the greater the discount value, and even drops below (0.5). This shows that the higher the fin, the lower the fin efficiency, and the economic efficiency of adding fins decreases.

For a 1-meter-long tube, let the total heat transfer area after adding finned tube fins be A, and the bare tube area without adding fins be A0, then A/A0 is the multiple of the area expansion, which is called the "fin ratio". The appropriate fin ratio should be determined by application conditions and optimization design.

Generally, the fin ratio of finned tubes used in energy engineering is between 5 and 12, while in the air conditioning and air cooling industries, the fin ratio is between 15 and 22.

The answer is no. It is not the case that the more the better, nor the higher the fins, the better.

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