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Thermohydraulic Performance and Entropy Generation of a Triple-Pass Solar Air Heater with Three Inlets

Author

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  • Nguyen Minh Phu

    (Faculty of Heat and Refrigeration Engineering, Industrial University of Ho Chi Minh City (IUH), 12 Nguyen Van Bao, Go Vap District, Ho Chi Minh City 700000, Vietnam)

  • Ngo Thien Tu

    (Faculty of Mechanical Engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet, District 10, Ho Chi Minh City 700000, Vietnam
    Vietnam National University, Linh Trung Ward, Thu Duc District, Ho Chi Minh City 700000, Vietnam)

  • Nguyen Van Hap

    (Faculty of Mechanical Engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet, District 10, Ho Chi Minh City 700000, Vietnam
    Vietnam National University, Linh Trung Ward, Thu Duc District, Ho Chi Minh City 700000, Vietnam)

Abstract

In this paper, a triple-pass solar air heater with three inlets is analytically investigated. The effects of airflow ratios of the second and third passes (ranging from 0 to 0.4), and the Reynolds number of the third pass (ranging from 8000 to 18,000) on the thermohydraulic efficiency and entropy generation are assessed. An absorber plate equipped with rectangular fins on both sides is used to enhance heat transfer. The air temperature change in the passes is represented by ordinary differential equations and solved by numerical integration. The results demonstrate that the effect of the third pass airflow ratio on the thermohydraulic efficiency and entropy generation is more significant than that of the second pass airflow ratio. The difference in air temperature through the collector shows an insignificant reduction, but the air pressure loss is only 50% compared with that of a traditional triple-pass solar air heater. Increasing the air flow ratios dramatically reduces entropy generation. Multi-objective optimization found a Reynolds number of 11,156 for both the airflow ratio of the second pass of 0.258 and airflow ratio of the third pass of 0.036 to be the an optimal value to achieve maximum thermohydraulic efficiency and minimum entropy generation.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:19:p:6399-:d:650933
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    References listed on IDEAS

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    1. Chii-Dong Ho & Hsuan Chang & Ching-Fang Hsiao & Chien-Chang Huang, 2018. "Device Performance Improvement of Recycling Double-Pass Cross-Corrugated Solar Air Collectors," Energies, MDPI, vol. 11(2), pages 1-18, February.
    2. 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.
    3. Naphon, Paisarn, 2005. "On the performance and entropy generation of the double-pass solar air heater with longitudinal fins," Renewable Energy, Elsevier, vol. 30(9), pages 1345-1357.
    4. Ho, Chii-Dong & Lin, Chun-Sheng & Chuang, Yu-Chuan & Chao, Chun-Chieh, 2013. "Performance improvement of wire mesh packed double-pass solar air heaters with external recycle," Renewable Energy, Elsevier, vol. 57(C), pages 479-489.
    5. Sopian, K. & Alghoul, M.A. & Alfegi, Ebrahim M. & Sulaiman, M.Y. & Musa, E.A., 2009. "Evaluation of thermal efficiency of double-pass solar collector with porous–nonporous media," Renewable Energy, Elsevier, vol. 34(3), pages 640-645.
    6. Fudholi, Ahmad & Sopian, Kamaruzzaman, 2019. "A review of solar air flat plate collector for drying application," Renewable and Sustainable Energy Reviews, Elsevier, vol. 102(C), pages 333-345.
    7. Farjana, Shahjadi Hisan & Huda, Nazmul & Mahmud, M.A. Parvez & Saidur, R., 2018. "Solar process heat in industrial systems – A global review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 82(P3), pages 2270-2286.
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    Cited by:

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