Second law optimization of a solar air heater having chamfered rib–groove roughness on absorber plate

Apurba Layek, J.S. Saini and S.C. Solanki

Renewable Energy, 2007, vol. 32, issue 12, 1967-1980

Abstract: Artificially roughened solar air heaters perform better than the plane ones under the same operating conditions. However, artificial roughness leads to even more fluid pressure thereby increasing the pumping power. The entropy generation in the duct of solar air heater having repeated transverse chamfered rib–groove roughness on one broad wall is studied numerically. Roughness parameters, viz., relative roughness pitch P/e, relative roughness height e/Dh relative groove position g/P, chamfer angle φ and flow Reynolds number Re have a combined effect on the heat transfer as well as fluid friction. The entropy generation is minimized and reasonably optimized designs of roughness are found.

Keywords: Compound roughness; Solar air heater; Entropy generation (search for similar items in EconPapers)
Date: 2007
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Citations: View citations in EconPapers (24)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:32:y:2007:i:12:p:1967-1980

DOI: 10.1016/j.renene.2006.11.005

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