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Optimization of flow-channel depth for conventional flat-plate solar air heaters

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  • Hegazy, Adel A.

Abstract

An analytical criterion for determining the optimum flow-channel depth of conventional flat-plate solar air heaters has been developed. The criterion gives the minimum channel-depth required to maximize the useful heat gain from the absorber plate to the flowing air for a particular pumping power. A parametric study was carried out to validate the engineering accuracy of the optimization criterion which was found to be considerably accurate over the entire range of variables covered. An expression for estimating the channel-depth-to-length ratio that yields an outlet air temperature equal to the absorber-plate mean temperature is also derived in terms of flow pumping power. This expression is of great importance for designers of this type of solar air heater.

Suggested Citation

  • Hegazy, Adel A., 1996. "Optimization of flow-channel depth for conventional flat-plate solar air heaters," Renewable Energy, Elsevier, vol. 7(1), pages 15-21.
    • Handle: RePEc:eee:renene:v:7:y:1996:i:1:p:15-21
    DOI: 10.1016/0960-1481(95)00117-4
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    References listed on IDEAS

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    1. Verma, Ratna & Chandra, Ram & Garg, H.P., 1992. "Optimization of solar air heaters of different designs," Renewable Energy, Elsevier, vol. 2(4), pages 521-531.
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    1. Hegazy, Adel A., 1999. "Technical note," Renewable Energy, Elsevier, vol. 18(2), pages 283-304.
    2. Nidhul, Kottayat & Yadav, Ajay Kumar & Anish, S. & Kumar, Sachin, 2021. "Critical review of ribbed solar air heater and performance evaluation of various V-rib configuration," Renewable and Sustainable Energy Reviews, Elsevier, vol. 142(C).
    3. Sharma, Sanjay K. & Kalamkar, Vilas R., 2015. "Thermo-hydraulic performance analysis of solar air heaters having artificial roughness–A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 41(C), pages 413-435.
    4. Chtioui, Salwa & Khouya, Ahmed, 2024. "Optimizing solar energy for wood drying under various climates: A comparative study of flat plate and photovoltaic thermal solar collectors," Renewable Energy, Elsevier, vol. 221(C).

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