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Analytical models of thermal performance of solar air heaters of double-parallel flow and double-pass counter flow

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  • Hernández, Alejandro L.
  • Quiñonez, José E.

Abstract

The development of two analytical models that describe the thermal behaviour of solar air heaters of double-parallel flow and double-pass counter flow is presented. Based on the local energy balances, algebraic expressions for the efficiency factor F′ and the overall heat loss coefficient, UL, as well as air temperature distributions along the collectors were obtained. In addition, the expressions of the mean temperatures of the two air streams and of the absorber plate were determined. The model corresponding to the solar collector with double-parallel flow predicts that the mass flow of air flowing between the absorber plate and the transparent cover is greater than the mass flow circulating through the other channel. The model corresponding to the solar collector of double-pass counter flow indicates that increasing the airflow proportionally increases the percentage temperature rise in the inlet channel. The analytical expressions developed are valuable tools that can be included in computational codes for the design and thermal analysis of solar air heating facilities or to improve current facilities. The paper include a graphic to estimate the heat transfer coefficients involved in energy balances.

Suggested Citation

  • Hernández, Alejandro L. & Quiñonez, José E., 2013. "Analytical models of thermal performance of solar air heaters of double-parallel flow and double-pass counter flow," Renewable Energy, Elsevier, vol. 55(C), pages 380-391.
    • Handle: RePEc:eee:renene:v:55:y:2013:i:c:p:380-391
    DOI: 10.1016/j.renene.2012.12.050
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    References listed on IDEAS

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    1. Sopian, K & Supranto, & Daud, W.R.W & Othman, M.Y & Yatim, B, 1999. "Thermal performance of the double-pass solar collector with and without porous media," Renewable Energy, Elsevier, vol. 18(4), pages 557-564.
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    4. Tchinda, Réné, 2009. "A review of the mathematical models for predicting solar air heaters systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 13(8), pages 1734-1759, October.
    5. Moummi, N & Youcef-Ali, S & Moummi, A & Desmons, J.Y, 2004. "Energy analysis of a solar air collector with rows of fins," Renewable Energy, Elsevier, vol. 29(13), pages 2053-2064.
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    Cited by:

    1. 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.
    2. Ahmed, Omer Khalil & Mohammed, Zala Aziz, 2017. "Influence of porous media on the performance of hybrid PV/Thermal collector," Renewable Energy, Elsevier, vol. 112(C), pages 378-387.
    3. Kumar, Amit & Singh, Ajeet Pratap & Akshayveer, & Singh, O.P., 2022. "Performance characteristics of a new curved double-pass counter flow solar air heater," Energy, Elsevier, vol. 239(PA).
    4. Das, Debayan & Lukose, Leo & Basak, Tanmay, 2018. "Role of multiple solar heaters along the walls for the thermal management during natural convection in square and triangular cavities," Renewable Energy, Elsevier, vol. 121(C), pages 205-229.
    5. Singh, Satyender & Dhiman, Prashant, 2016. "Thermal performance of double pass packed bed solar air heaters – A comprehensive review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 53(C), pages 1010-1031.
    6. Kumar, Amit & Akshayveer, & Singh, Ajeet Pratap & Singh, O.P., 2020. "Efficient designs of double-pass curved solar air heaters," Renewable Energy, Elsevier, vol. 160(C), pages 1105-1118.

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