Is it better to have more fins on a finned tube, or are taller fins preferable?

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When the heat-transfer area of a finned tube is doubled, its heat-transfer coefficient does not increase by a factor of two; instead, it is reduced by a correction factor, typically ranging from 0.9 to 0.7. Moreover, as the fin height increases, this correction factor becomes even larger, sometimes dropping below 0.5.

2020-06-12

　　1. When the heat-transfer area of a finned tube is doubled, its heat-transfer coefficient does not increase by a factor of two; instead, it is reduced by a correction factor, typically ranging from 0.9 to 0.7. Moreover, as the fin height increases, this correction factor becomes even larger, sometimes dropping below 0.5. This indicates that the taller the fins, the lower their efficiency, and consequently, the diminished economic benefit of adding more fins.

　　2. If the fins are too tall and too closely spaced, they are prone to dust accumulation, and cleaning them becomes difficult.

　　3. If the fins are too tall and too closely spaced, it will increase manufacturing complexity and raise processing costs.

Mainstream brands in the heat exchanger industry enjoy strong growth advantages.

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