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Heat-transfer enhancement in double-pass flat-plate solar air heaters with recycle

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  • Ho, C.D.
  • Yeh, H.M.
  • Wang, R.C.

Abstract

This work theoretically and experimentally investigates a device for inserting an absorbing plate into the double-pass channel in a flat-plate solar air heater with recycle. This method substantially improves the collector efficiency by increasing the fluid velocity. The results are represented graphically and compared with a downward-type single-pass solar air heater. Considerable improvement in heat transfer is obtainable by employing recycle-type double-pass devices instead of single-pass devices or a conventional double-pass heater with the same flow rate. The absorbing plate location influence on heat-transfer efficiency enhancement and the hydraulic dissipated power increment is also discussed.

Suggested Citation

  • Ho, C.D. & Yeh, H.M. & Wang, R.C., 2005. "Heat-transfer enhancement in double-pass flat-plate solar air heaters with recycle," Energy, Elsevier, vol. 30(15), pages 2796-2817.
    • Handle: RePEc:eee:energy:v:30:y:2005:i:15:p:2796-2817
    DOI: 10.1016/j.energy.2005.01.006
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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. Garg, H.P. & Sharma, V.K. & Bhargava, A.K., 1985. "Theory of multiple-pass solar air heaters," Energy, Elsevier, vol. 10(5), pages 589-599.
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