Effect of fin pitches on the air-side performance of crimped spiral fin-and-tube heat exchangers with a multipass parallel and counter cross-flow configuration |
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Authors: | Parinya Pongsoi Santi Pikulkajorn Chi-Chuan Wang Somchai Wongwises |
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Affiliation: | 1. Babol University of Technology, Mechanical Engineering Department, Babol, Iran;2. Department of Mechanical Engineering, Mazandaran Institute of Technology, Babol, Iran;1. Department of mechanical engineering, National Chiao Tung University, Hsinchu 300, Taiwan;2. Green Energy & Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu 310, Taiwan |
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Abstract: | This study investigates the effect of fin pitches and fin materials on the air-side performance of crimped fin-and-tube heat exchangers in the range of high Reynolds numbers (4000–13000). The test samples are made from copper and aluminium with different fin pitches (fp = 3.2, 4.2 and 6.2 mm). It is found that the proposed simple average effectiveness equation from the pure counter and parallel circuitry arrangement can well represent the effectiveness-NTU relationship for the current z-shape arrangement. The experimental results reveal that the fin pitch casts insignificant effect on the heat transfer characteristics (Colburn j factor). However, a detectable rise of the friction factor is seen when the fin pitch is increased to fp = 6.2 mm. On the other hand, the effect of fin material on the airside performance is negligible. |
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