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Experimental study of heat transfer and flow friction insolar air heaters with and without selective absorbers

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  • Hachemi, A.

Abstract

High thermal performances have been needed for the use of solar air collectors andcompact heat exchangers. The thermal performance improvements have prompted us to lead thiscomparative study on the solar air heaters with and without selective absorbers. Rectangular finsare soldered staggered on the collectors back. The interstices are let between two consecutive finslocated in the same rows. The fluid flow undergoes constrictions followed one after the other byexpansions. A turbulent fluid flow is developed, that permits the improvement of the thermalheat transfer of these collectors in comparison to the flat-plate. For the same fin configurations,the thermal heat transfer coefficient has been evaluated with selective or non-selectiveabsorber-plate. The results obtained with the fin configurations with black-painted absorber(non-selective absorber), are compared with those of the fin configuration with coppersunabsorber-plate (selective absorber). The aim of this study is to show that the nature of theabsorber-plate (selective or nonselective) has no important effect on the thermal performances ofthe fanned system collector. Only a trivial increase is noted on behalf of the selective absorbercollector.

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  • Hachemi, A., 1999. "Experimental study of heat transfer and flow friction insolar air heaters with and without selective absorbers," Renewable Energy, Elsevier, vol. 17(2), pages 155-168.
    • Handle: RePEc:eee:renene:v:17:y:1999:i:2:p:155-168
    DOI: 10.1016/S0960-1481(98)00114-1
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    References listed on IDEAS

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    1. Choudhury, C. & Garg, H.P., 1991. "Design analysis of corrugated and flat plate solar air heaters," Renewable Energy, Elsevier, vol. 1(5), pages 595-607.
    2. Yeh, Ho-Ming & Ting, Young-Chun, 1988. "Efficiency of solar air heaters packed with iron filings," Energy, Elsevier, vol. 13(7), pages 543-547.
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    Cited by:

    1. Rajarajeswari, K. & Sreekumar, A., 2016. "Matrix solar air heaters – A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 57(C), pages 704-712.
    2. Kurtbas, İrfan & Durmus̨, Aydın, 2004. "Efficiency and exergy analysis of a new solar air heater," Renewable Energy, Elsevier, vol. 29(9), pages 1489-1501.

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