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

Parinya Pongsoi, Santi Pikulkajorn, Chi-Chuan Wang, Somchai Wongwises*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

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 (f p = 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 f p = 6.2 mm. On the other hand, the effect of fin material on the airside performance is negligible.

Original languageEnglish
Pages (from-to)2234-2240
Number of pages7
JournalInternational Journal of Heat and Mass Transfer
Volume54
Issue number9-10
DOIs
StatePublished - 1 Apr 2011

Keywords

  • Air-water
  • Extended surface
  • Fin
  • Heat exchanger
  • Heat transfer

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