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Thermal analysis of the performances of helical-type, roughened, double-pipe heat exchangers

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  • Hsieh, Shou-Shing
  • Liauh, Chihng-Tsung
  • Ku, Anthony C.

Abstract

Parallel-type heat exchangers with artifically roughened elements on the outer surface of the inner tube were designed to investigate the effect of augmentation heat transfer on this kind of heat exchanger. The objective is to evaluate the possibility of replacing classical heat exchangers with the aim of improving heat transfer performance and material cost reduction. The Nusselt numbers for water flows with a helical angle [alpha] = 65°, a pitch-to-height ratio p/e = 1·45, and two aspect ratios (shellside diameter to tubeside diameter) of Do/Di = 2·68 and 5·1 are obtained and a comparison of these results with those for a smooth tube at the same aspect ratios is also discussed.

Suggested Citation

  • Hsieh, Shou-Shing & Liauh, Chihng-Tsung & Ku, Anthony C., 1987. "Thermal analysis of the performances of helical-type, roughened, double-pipe heat exchangers," Applied Energy, Elsevier, vol. 26(1), pages 67-73.
    • Handle: RePEc:eee:appene:v:26:y:1987:i:1:p:67-73
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