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CFD Analysis on the Heat Transfer and Fluid Flow of Solar Air Heater having Transverse Triangular Block at the Bottom of Air Duct

Author

Listed:
  • Hwi-Ung Choi

    (Department of Refrigeration and Air-Conditioning Engineering, Pukyong National University, Busan 48513, Korea)

  • Kwang-Hwan Choi

    (Department of Refrigeration and Air-Conditioning Engineering, Pukyong National University, Busan 48513, Korea)

Abstract

In this study, a two-dimensional CFD (computational fluid dynamics) analysis was performed to investigate the heat-transfer and fluid-friction characteristics in a solar air heater having a transverse triangular block at the bottom of the air duct. The Reynolds number, block height ( e ), pitch ( P ), and length ( l ) were chosen as design parameters. The results are validated by comparing the Nusselt number predicted by simulation with available experimental results. Renormalization-group (RNG) k - ε model with enhanced wall-treatment was selected as the most appropriate turbulence model. From the results, it was found that the presence of a transverse triangular block produces a higher Nusselt number than that of smooth air duct. The enhancement in Nusselt number varied from 1.19 to 3.37, according to the geometric conditions investigated. However, the use of transverse triangular block also results in significantly higher friction losses. The thermohydraulic performance (THPP) was also estimated and has a maximum value of 1.001 for height ( e ) of 20 mm, length ( l ) of 120 mm, and pitch ( P ) of 150 mm, at Reynolds number of 8000. Furthermore, in the present study, correlations of the Nusselt number and friction factor were developed as a function of geometrical conditions of the transverse triangular block and Reynolds number, which can be used to predict the value of Nusselt number and friction factor with the absolute percentage deviations of 3.29% and 7.92%, respectively.

Suggested Citation

  • Hwi-Ung Choi & Kwang-Hwan Choi, 2020. "CFD Analysis on the Heat Transfer and Fluid Flow of Solar Air Heater having Transverse Triangular Block at the Bottom of Air Duct," Energies, MDPI, vol. 13(5), pages 1-19, March.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:5:p:1099-:d:327105
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    References listed on IDEAS

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    Cited by:

    1. Choi, Hwiung & Choi, Kwanghwan, 2022. "Parametric study of a novel air-based photovoltaic-thermal collector with a transverse triangular-shaped block," Renewable Energy, Elsevier, vol. 201(P1), pages 96-110.
    2. Madhwesh Nagaraj & Manu Krishna Reddy & Arun Kumar Honnesara Sheshadri & Kota Vasudeva Karanth, 2022. "Numerical Analysis of an Aerofoil Fin Integrated Double Pass Solar Air Heater for Thermal Performance Enhancement," Sustainability, MDPI, vol. 15(1), pages 1-22, December.
    3. Hwi-Ung Choi & Kwang-Hwan Choi, 2022. "Performance Evaluation of PVT Air Collector Coupled with a Triangular Block in Actual Climate Conditions in Korea," Energies, MDPI, vol. 15(11), pages 1-12, June.
    4. Hwi-Ung Choi & Kwang-Am Moon & Seong-Bhin Kim & Kwang-Hwan Choi, 2023. "CFD Analysis of the Heat Transfer and Fluid Flow Characteristics Using the Rectangular Rib Attached to the Fin Surface in a Solar Air Heater," Sustainability, MDPI, vol. 15(6), pages 1-18, March.
    5. Byeong-Hwa An & Kwang-Hwan Choi & Hwi-Ung Choi, 2023. "Heat Transfer Augmentation and Friction Factor Due to the Arrangement of Rectangular Turbulators in a Finned Air Channel of a Solar Air Heater," Energies, MDPI, vol. 16(19), pages 1-18, September.
    6. 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).
    7. Byeong-Hwa An & Kwang-Hwan Choi & Hwi-Ung Choi, 2022. "Influence of Triangle-Shaped Obstacles on the Energy and Exergy Performance of an Air-Cooled Photovoltaic Thermal (PVT) Collector," Sustainability, MDPI, vol. 14(20), pages 1-19, October.

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