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Performance of solar air heater ducts with different types of ribs on the absorber plate

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  • Tanda, Giovanni

Abstract

Repeated ribs are considered an effective technique to enhance forced convection heat transfer in channels. In order to establish the performance of rib-roughened channels, both heat transfer and friction characteristics have to be accounted for. In the present paper, heat transfer coefficients and friction factors have been experimentally investigated for a rectangular channel having one wall roughened by repeated ribs and heated at uniform flux, while the remaining three walls were smooth and insulated. Angled continuous ribs, transverse continuous and broken ribs, and discrete V-shaped ribs were considered as rib configurations. Different performance evaluation criteria, based on energy balance or entropy generation analysis, were proposed to assess the relative merit of each rib configuration. All the rib-roughened channels performed better than the reference smooth channel in the medium-low range of the investigated Reynolds number values, which is that typically encountered in solar air heater applications.

Suggested Citation

  • Tanda, Giovanni, 2011. "Performance of solar air heater ducts with different types of ribs on the absorber plate," Energy, Elsevier, vol. 36(11), pages 6651-6660.
    • Handle: RePEc:eee:energy:v:36:y:2011:i:11:p:6651-6660
    DOI: 10.1016/j.energy.2011.08.043
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    References listed on IDEAS

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