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Collector Efficiency in Downward-Type Double-Pass Solar Air Heaters with Attached Fins and Operated by External Recycle

Author

Listed:
  • Ho-Ming Yeh

    (Energy and Opto-Electronic Materials Research Center, Department of Chemical and Materials Engineering, Tamkang University, Tamsui, New Taipei 251, Taiwan)

  • Chii-Dong Ho

    (Energy and Opto-Electronic Materials Research Center, Department of Chemical and Materials Engineering, Tamkang University, Tamsui, New Taipei 251, Taiwan)

Abstract

The collector efficiency in a downward-type double-pass external-recycle solar air heater with fins attached on the absorbing plate has been investigated theoretically. Considerable improvement in collector efficiency is obtainable if the collector is equipped with fins and the operation is carried out with an external recycle. Due to the recycling, the desirable effect of increasing the heat transfer coefficient compensates for the undesirable effect of decreasing the driving force (temperature difference) of heat transfer, while the attached fins provide an enlarged heat transfer area. The order of performances in the devices of same size is: double pass with recycle and fins > double pass with recycle but without fins > single pass without recycle and fins.

Suggested Citation

  • Ho-Ming Yeh & Chii-Dong Ho, 2012. "Collector Efficiency in Downward-Type Double-Pass Solar Air Heaters with Attached Fins and Operated by External Recycle," Energies, MDPI, vol. 5(8), pages 1-16, July.
    • Handle: RePEc:gam:jeners:v:5:y:2012:i:8:p:2692-2707:d:19098
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    References listed on IDEAS

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    1. Yeh, Ho-ming & Lin, Tong-Tshien, 1995. "The effect of collector aspect ratio on the collector efficiency of flat-plate solar air heaters," Energy, Elsevier, vol. 20(10), pages 1041-1047.
    2. Naphon, Paisarn, 2005. "On the performance and entropy generation of the double-pass solar air heater with longitudinal fins," Renewable Energy, Elsevier, vol. 30(9), pages 1345-1357.
    3. Yeh, Ho-Ming & Ting, Young-Chun, 1986. "Effects of free convection on collector efficiencies of solar air heaters," Applied Energy, Elsevier, vol. 22(2), pages 145-155.
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    Cited by:

    1. Fudholi, Ahmad & Sopian, Kamaruzzaman, 2019. "A review of solar air flat plate collector for drying application," Renewable and Sustainable Energy Reviews, Elsevier, vol. 102(C), pages 333-345.

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