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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Publication Details
Author list: Pongsoi P., Pikulkajorn S., Wang C.-C., Wongwises S.
Publisher: Elsevier
Publication year: 2011
Journal: International Journal of Heat and Mass Transfer (0017-9310)
Volume number: 54
Issue number: #
Start page: 2234
End page: 2240
Number of pages: 7
ISSN: 0017-9310
eISSN: 1879-2189
Languages: English-Great Britain (EN-GB)
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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. ฉ 2010 Elsevier Ltd. All rights reserved.
Keywords
Air-water, Extended surface
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