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Effect of external recycle on the performances of flat-plate solar air heaters with internal fins attached

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  • Yeh, Ho-Ming
  • Ho, Chii-Dong

Abstract

The influence of external recycle on the collector efficiency in solar air heaters with internal fins attached, has been investigated theoretically. The application of external recycle operation to solar air heaters actually has two conflict effects. One is the increase in fluid velocity to decrease the heat-transfer resistance, which is good for performance, while the other is lowering the driving force (temperature difference) of heat-transfer, due to the remixing at the inlet, which is bad for performance. It is found that considerable improvement in collector efficiency is obtainable if the operation is carried out with an external recycle, where the desirable effect overcomes the undesirable effect. The enhancement increases with increasing reflux ratio, especially for operating at lower air flow rate with higher inlet air temperature.

Suggested Citation

  • Yeh, Ho-Ming & Ho, Chii-Dong, 2009. "Effect of external recycle on the performances of flat-plate solar air heaters with internal fins attached," Renewable Energy, Elsevier, vol. 34(5), pages 1340-1347.
    • Handle: RePEc:eee:renene:v:34:y:2009:i:5:p:1340-1347
    DOI: 10.1016/j.renene.2008.09.005
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    References listed on IDEAS

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    1. Gao, Wenfeng & Lin, Wenxian & Liu, Tao & Xia, Chaofeng, 2007. "Analytical and experimental studies on the thermal performance of cross-corrugated and flat-plate solar air heaters," Applied Energy, Elsevier, vol. 84(4), pages 425-441, April.
    2. 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.
    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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