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Collector Efficiency in Downward-Type Internal-Recycle Solar Air Heaters with Attached Fins

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 internal-recycle operation effect on collector efficiency in downward-type rectangular solar air heaters with attached fins is theoretically investigated. It is found that considerable collector efficiency is obtainable if the collector has attached fins and the operation is carried out with internal recycling. The recycling operation increases the fluid velocity to decrease the heat transfer resistance, compensating for the undesirable effect of decreasing the heat transfer driving force (temperature difference) due to remixing. The attached fins provide an enlarged heat transfer area. The order of performance in a device 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, 2013. "Collector Efficiency in Downward-Type Internal-Recycle Solar Air Heaters with Attached Fins," Energies, MDPI, vol. 6(10), pages 1-15, October.
    • Handle: RePEc:gam:jeners:v:6:y:2013:i:10:p:5130-5144:d:29360
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    References listed on IDEAS

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    1. Tonui, J.K. & Tripanagnostopoulos, Y., 2007. "Improved PV/T solar collectors with heat extraction by forced or natural air circulation," Renewable Energy, Elsevier, vol. 32(4), pages 623-637.
    2. 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. Luigi Ventola & Gabriele Curcuruto & Matteo Fasano & Saverio Fotia & Vincenzo Pugliese & Eliodoro Chiavazzo & Pietro Asinari, 2016. "Unshrouded Plate Fin Heat Sinks for Electronics Cooling: Validation of a Comprehensive Thermal Model and Cost Optimization in Semi-Active Configuration," Energies, MDPI, vol. 9(8), pages 1-16, August.
    2. Muhammad Umair & Atsushi Akisawa & Yuki Ueda, 2014. "Performance Evaluation of a Solar Adsorption Refrigeration System with a Wing Type Compound Parabolic Concentrator," Energies, MDPI, vol. 7(3), pages 1-19, March.
    3. Nguyen Minh Phu & Ngo Thien Tu & Nguyen Van Hap, 2021. "Thermohydraulic Performance and Entropy Generation of a Triple-Pass Solar Air Heater with Three Inlets," Energies, MDPI, vol. 14(19), pages 1-19, October.

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