IDEAS home Printed from https://ideas.repec.org/a/eee/appene/v7y1980i1-3p129-145.html
   My bibliography  Save this article

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

Author

Listed:
  • 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
    as

    Download full text from publisher

    File URL: http://www.sciencedirect.com/science/article/pii/0306-2619(80)90054-9
    Download Restriction: Full text for ScienceDirect subscribers only
    ---><---

    As the access to this document is restricted, you may want to search for a different version of it.

    Citations

    Citations are extracted by the CitEc Project, subscribe to its RSS feed for this item.
    as


    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. 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.
    4. 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.
    5. 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.
    6. 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.
    7. 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.
    8. 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.

    More about this item

    Statistics

    Access and download statistics

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:eee:appene:v:7:y:1980:i:1-3:p:129-145. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    We have no bibliographic references for this item. You can help adding them by using this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: Catherine Liu (email available below). General contact details of provider: http://www.elsevier.com/wps/find/journaldescription.cws_home/405891/description#description .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.