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Effective efficiency of solar air heaters having different types of roughness elements on the absorber plate

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Listed:
  • Mittal, M.K.
  • Varun,
  • Saini, R.P.
  • Singal, S.K.

Abstract

The use of an artificial roughness on a surface is an effective technique to enhance the rate of heat transfer to fluid flow in the duct of a solar air heater. This paper presents a comparison of effective efficiency of solar air heaters having different types of geometry of roughness elements on the absorber plate. The effective efficiency has been computed by using the correlations for heat transfer and friction factor developed by various investigators within the investigated range of operating and system parameters.

Suggested Citation

  • Mittal, M.K. & Varun, & Saini, R.P. & Singal, S.K., 2007. "Effective efficiency of solar air heaters having different types of roughness elements on the absorber plate," Energy, Elsevier, vol. 32(5), pages 739-745.
    • Handle: RePEc:eee:energy:v:32:y:2007:i:5:p:739-745
    DOI: 10.1016/j.energy.2006.05.009
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    References listed on IDEAS

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    1. Cortés, A. & Piacentini, R., 1990. "Improvement of the efficiency of a bare solar collector by means of turbulence promoters," Applied Energy, Elsevier, vol. 36(4), pages 253-261.
    2. 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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