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Investigation of thermal performance of solar air heater having roughness elements as a combination of inclined and transverse ribs on the absorber plate

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  • Varun,
  • Saini, R.P.
  • Singal, S.K.

Abstract

An experimental investigation has been carried out to study the heat transfer and friction characteristics by using a combination of inclined as well as transverse ribs on the absorber plate of a solar air heater. The experimental investigation encompassed the Reynolds number (Re) ranges from 2000 to 14000, relative roughness pitch (p/e) 3–8 and relative roughness height (e/Dh) 0.030. The effect of these parameters on the heat transfer coefficient and friction factor has been discussed in the present paper and correlations for Nusselt number and friction factor has been developed within the reasonable limits. A procedure to compute the thermal efficiency based on heat transfer processes in the system is also given and the effect of these parameters on thermal efficiency has been discussed.

Suggested Citation

  • Varun, & Saini, R.P. & Singal, S.K., 2008. "Investigation of thermal performance of solar air heater having roughness elements as a combination of inclined and transverse ribs on the absorber plate," Renewable Energy, Elsevier, vol. 33(6), pages 1398-1405.
    • Handle: RePEc:eee:renene:v:33:y:2008:i:6:p:1398-1405
    DOI: 10.1016/j.renene.2007.07.013
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    References listed on IDEAS

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    1. Bhagoria, J.L & Saini, J.S & Solanki, S.C, 2002. "Heat transfer coefficient and friction factor correlations for rectangular solar air heater duct having transverse wedge shaped rib roughness on the absorber plate," Renewable Energy, Elsevier, vol. 25(3), pages 341-369.
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