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Thermal Evaluation of a Double-Pass Unglazed Solar Air Heater with Perforated Plate and Wire Mesh Layers

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  • Afaq Jasim Mahmood

    (Department of Power Mechanics Techniques, Institute of Technology Baghdad, Middle Technical University, Baghdad 10001, Iraq)

Abstract

In this study, an experimental outdoor investigation of the thermal efficiency and outlet air temperature was conducted on an unglazed, double-pass, solar air heater with a perforated absorber plate and packing wire mesh layers as a supplemental absorbent area. This was done to observe their effects on the thermal performance of the solar air heater. The double-pass collector was constructed with a bed height of 0.05 m, and a collection area of 1.5 m 2 . The height of the upper channel was fixed at 0.015 m to improve the thermal efficiency, and the outlet temperature at air flow rates between 0.003 and 0.018 kg/s. The collector was mounted with a slope of 42° facing south, to maximize the intensity of solar irradiance during winter. The effects of the air flow rate, ambient temperature, inlet temperature, outlet temperature, and solar intensity were experimentally investigated. The results showed that thermal efficiency could be improved by increasing the air flow rate, where the highest thermal efficiency achieved was 86% at 0.018 kg/s. However, the temperature difference was increased to a maximum value of 38.6 °C, when the air flow rate was decreased to 0.003 kg/s. Furthermore, the results demonstrated a significant improvement in the thermal efficiency and outlet temperature; and when compared with previous research, the experimental results and the predictions for the outlet temperature using the theoretical model agreed.

Suggested Citation

  • Afaq Jasim Mahmood, 2020. "Thermal Evaluation of a Double-Pass Unglazed Solar Air Heater with Perforated Plate and Wire Mesh Layers," Sustainability, MDPI, vol. 12(9), pages 1-15, April.
    • Handle: RePEc:gam:jsusta:v:12:y:2020:i:9:p:3619-:d:352496
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    References listed on IDEAS

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    1. Dhiman, Prashant & Thakur, N.S. & Chauhan, S.R., 2012. "Thermal and thermohydraulic performance of counter and parallel flow packed bed solar air heaters," Renewable Energy, Elsevier, vol. 46(C), pages 259-268.
    2. Zheng, Wandong & Li, Bojia & Zhang, Huan & You, Shijun & Li, Ying & Ye, Tianzhen, 2016. "Thermal characteristics of a glazed transpired solar collector with perforating corrugated plate in cold regions," Energy, Elsevier, vol. 109(C), pages 781-790.
    3. Nowzari, Raheleh & Aldabbagh, L.B.Y. & Egelioglu, F., 2014. "Single and double pass solar air heaters with partially perforated cover and packed mesh," Energy, Elsevier, vol. 73(C), pages 694-702.
    4. Aldabbagh, L.B.Y. & Egelioglu, F. & Ilkan, M., 2010. "Single and double pass solar air heaters with wire mesh as packing bed," Energy, Elsevier, vol. 35(9), pages 3783-3787.
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    Cited by:

    1. Kumar, Rajneesh & Goel, Varun, 2021. "Unconventional solar air heater with triangular flow-passage: A CFD based comparative performance assessment of different cross-sectional rib-roughnesses," Renewable Energy, Elsevier, vol. 172(C), pages 1267-1278.
    2. Vengadesan, Elumalai & Senthil, Ramalingam, 2020. "A review on recent developments in thermal performance enhancement methods of flat plate solar air collector," Renewable and Sustainable Energy Reviews, Elsevier, vol. 134(C).

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