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Thermo-Hydraulic Performance of Solar Air Collectors with Artificially Roughened Absorbers: A Comparative Review of Semi-Empirical Models

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  • António Araújo

    () (Faculdade de Engenharias e Tecnologias, Universidade Lusíada Norte, 4760-108 Vila Nova de Famalicão, Portugal)

Abstract

Due to the poor thermal characteristics of the air, the absorber roughness of solar air collectors is commonly artificially increased in order to enhance the heat transfer to the air stream. However, this is also accompanied by an undesirable increase in the pumping power due to increased friction losses. As a result, several authors have experimentally investigated several ways of maximizing the heat transfer while minimizing the friction losses of different absorbers, resulting in the development of semi-empirical functions relating the Nusselt number (a measure of heat transfer) and the friction factor (a measure of friction losses) to the Reynolds number and the roughness parameters considered for each absorber. The present paper reviews, considering the publications from the last ten years, these semi-empirical functions. Moreover, the optimum roughness parameters and operating conditions of the absorbers were estimated by finding the maximum values of two performance parameters (the thermo-hydraulic efficiency and effectiveness), calculated using the semi-empirical functions, in order to classify the absorbers in terms of their energy characteristics. This approach proves to be a rather effective way of optimizing the roughness characteristics of solar air collector absorbers. It is also concluded that, considering the range of absorbers analyzed here, generally, multiple V-shaped ribs with gaps provide the most effective roughness geometry.

Suggested Citation

  • António Araújo, 2020. "Thermo-Hydraulic Performance of Solar Air Collectors with Artificially Roughened Absorbers: A Comparative Review of Semi-Empirical Models," Energies, MDPI, Open Access Journal, vol. 13(14), pages 1-34, July.
  • Handle: RePEc:gam:jeners:v:13:y:2020:i:14:p:3536-:d:382198
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    References listed on IDEAS

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    1. Singh Yadav, Anil & Kumar Thapak, Manish, 2014. "Artificially roughened solar air heater: Experimental investigations," Renewable and Sustainable Energy Reviews, Elsevier, vol. 36(C), pages 370-411.
    2. Kumar, Anup & Layek, Apurba, 2019. "Nusselt number and friction factor correlation of solar air heater having twisted-rib roughness on absorber plate," Renewable Energy, Elsevier, vol. 130(C), pages 687-699.
    3. 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.
    4. Singh, Sukhmeet & Chander, Subhash & Saini, J.S., 2011. "Heat transfer and friction factor correlations of solar air heater ducts artificially roughened with discrete V-down ribs," Energy, Elsevier, vol. 36(8), pages 5053-5064.
    5. Singh, Satyender & Chaurasiya, Shailendra Kumar & Negi, Bharat Singh & Chander, Subhash & Nemś, Magdalena & Negi, Sushant, 2020. "Utilizing circular jet impingement to enhance thermal performance of solar air heater," Renewable Energy, Elsevier, vol. 154(C), pages 1327-1345.
    6. Deo, Narinderpal Singh & Chander, Subhash & Saini, J.S., 2016. "Performance analysis of solar air heater duct roughened with multigap V-down ribs combined with staggered ribs," Renewable Energy, Elsevier, vol. 91(C), pages 484-500.
    7. 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.
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    Keywords

    solar air heating; absorber; artificial roughness; optimization;

    JEL classification:

    • Q - Agricultural and Natural Resource Economics; Environmental and Ecological Economics
    • Q0 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - General
    • Q4 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy
    • Q40 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy - - - General
    • Q41 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy - - - Demand and Supply; Prices
    • Q42 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy - - - Alternative Energy Sources
    • Q43 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy - - - Energy and the Macroeconomy
    • Q47 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy - - - Energy Forecasting
    • Q48 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy - - - Government Policy
    • Q49 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy - - - Other

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