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Free convection and shading due to gap spacing between an absorber plate and the cover glazing in solar energy flat-plate collectors

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  • Nahar, N.M.
  • Garg, H.P.

Abstract

Natural convection losses between an absorber plate and the cover glazing for different gap sizes and at different plate temperatures have been predicted theoretically by various empirical correlations developed by McAdams,4 Mikheyev,3 Tabor,5 Buchberg et al.6 and Hollands et al.7 The free convection heat transfer coefficients have been evaluated for horizontal, vertical and tilted collectors. The natural convection coefficient decreases and the shading due to side walls increases with increase in gap size. Therefore, the shade correction factor has also been calculated for different collector inclinations for low and medium latitude stations. By taking into consideration both these factors--that is, convection losses and shading--the air gap between the absorber plate and the cover glazing has been optimised. It has been found that, for minimum shading and minimum convection losses, a gap of 4 to 5 cm should be maintained between the absorber plate and the cover glazing in typical flat-plate solar energy collectors.

Suggested Citation

  • Nahar, N.M. & Garg, H.P., 1980. "Free convection and shading due to gap spacing between an absorber plate and the cover glazing in solar energy flat-plate collectors," Applied Energy, Elsevier, vol. 7(1-3), pages 129-145, November.
    • Handle: RePEc:eee:appene:v:7:y:1980:i:1-3:p:129-145
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    Cited by:

    1. Missirlis, D. & Martinopoulos, G. & Tsilingiridis, G. & Yakinthos, K. & Kyriakis, N., 2014. "Investigation of the heat transfer behaviour of a polymer solar collector for different manifold configurations," Renewable Energy, Elsevier, vol. 68(C), pages 715-723.
    2. Martinopoulos, G. & Missirlis, D. & Tsilingiridis, G. & Yakinthos, K. & Kyriakis, N., 2010. "CFD modeling of a polymer solar collector," Renewable Energy, Elsevier, vol. 35(7), pages 1499-1508.
    3. Srinivas, Morapakala, 2011. "Domestic solar hot water systems: Developments, evaluations and essentials for “viability” with a special reference to India," Renewable and Sustainable Energy Reviews, Elsevier, vol. 15(8), pages 3850-3861.
    4. Farhadi, Rouhollah & Taki, Morteza, 2020. "The energy gain reduction due to shadow inside a flat-plate solar collector," Renewable Energy, Elsevier, vol. 147(P1), pages 730-740.
    5. Saxena, Abhishek & Varun, & El-Sebaii, A.A., 2015. "A thermodynamic review of solar air heaters," Renewable and Sustainable Energy Reviews, Elsevier, vol. 43(C), pages 863-890.
    6. Nahar, N.M, 2002. "Capital cost and economic viability of thermosyphonic solar water heaters manufactured from alternate materials in India," Renewable Energy, Elsevier, vol. 26(4), pages 623-635.
    7. Zheng, Wandong & Li, Bojia & Zhang, Huan & You, Shijun & Li, Ying & Ye, Tianzhen, 2016. "Thermal characteristics of a glazed transpired solar collector with perforating corrugated plate in cold regions," Energy, Elsevier, vol. 109(C), pages 781-790.
    8. Sakhaei, Seyed Ali & Valipour, Mohammad Sadegh, 2019. "Performance enhancement analysis of The flat plate collectors: A comprehensive review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 102(C), pages 186-204.

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