IDEAS home Printed from https://ideas.repec.org/a/gam/jeners/v13y2020i5p1099-d327105.html
   My bibliography  Save this article

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, Open Access Journal, vol. 13(5), pages 1-19, March.
  • Handle: RePEc:gam:jeners:v:13:y:2020:i:5:p:1099-:d:327105
    as

    Download full text from publisher

    File URL: https://www.mdpi.com/1996-1073/13/5/1099/pdf
    Download Restriction: no

    File URL: https://www.mdpi.com/1996-1073/13/5/1099/
    Download Restriction: no

    References listed on IDEAS

    as
    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, Open Access Journal, vol. 11(2), pages 1-18, February.
    2. Anil Kumar & Man-Hoe Kim, 2016. "CFD Analysis on the Thermal Hydraulic Performance of an SAH Duct with Multi V-Shape Roughened Ribs," Energies, MDPI, Open Access Journal, vol. 9(6), pages 1-23, May.
    3. Kumar, Sharad & Saini, R.P., 2009. "CFD based performance analysis of a solar air heater duct provided with artificial roughness," Renewable Energy, Elsevier, vol. 34(5), pages 1285-1291.
    4. Singh, Sukhmeet & Singh, Bikramjit & Hans, V.S. & Gill, R.S., 2015. "CFD (computational fluid dynamics) investigation on Nusselt number and friction factor of solar air heater duct roughened with non-uniform cross-section transverse rib," Energy, Elsevier, vol. 84(C), pages 509-517.
    5. Singh, Sukhmeet & Chander, Subhash & Saini, J.S., 2011. "Heat transfer and friction factor correlations of solar air heater ducts artificially roughened with discrete V-down ribs," Energy, Elsevier, vol. 36(8), pages 5053-5064.
    6. Yadav, Anil Singh & Bhagoria, J.L., 2013. "A CFD (computational fluid dynamics) based heat transfer and fluid flow analysis of a solar air heater provided with circular transverse wire rib roughness on the absorber plate," Energy, Elsevier, vol. 55(C), pages 1127-1142.
    7. Gawande, Vipin B. & Dhoble, A.S. & Zodpe, D.B. & Chamoli, Sunil, 2016. "A review of CFD methodology used in literature for predicting thermo-hydraulic performance of a roughened solar air heater," Renewable and Sustainable Energy Reviews, Elsevier, vol. 54(C), pages 550-605.
    8. Wandong Zheng & Huan Zhang & Shijun You & Yindan Fu, 2017. "Experimental Investigation of the Transpired Solar Air Collectors and Metal Corrugated Packing Solar Air Collectors," Energies, MDPI, Open Access Journal, vol. 10(3), pages 1-12, March.
    9. Prasad, K. & Mullick, S. C., 1983. "Heat transfer characteristics of a solar air heater used for drying purposes," Applied Energy, Elsevier, vol. 13(2), pages 83-93, February.
    10. Varun Kumar B. & G. Manikandan & P. Rajesh Kanna & Dawid Taler & Jan Taler & Marzena Nowak-Ocłoń & Karol Mzyk & Hoong Thiam Toh, 2018. "A Performance Evaluation of a Solar Air Heater Using Different Shaped Ribs Mounted on the Absorber Plate—A Review," Energies, MDPI, Open Access Journal, vol. 11(11), pages 1-20, November.
    Full references (including those not matched with items on IDEAS)

    More about this item

    Keywords

    solar air heater; solar collector; Nusselt number; CFD; friction factor;

    JEL classification:

    • Q - Agricultural and Natural Resource Economics; Environmental and Ecological Economics
    • Q0 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - General
    • Q4 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy
    • Q40 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy - - - General
    • Q41 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy - - - Demand and Supply; Prices
    • Q42 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy - - - Alternative Energy Sources
    • Q43 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy - - - Energy and the Macroeconomy
    • Q47 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy - - - Energy Forecasting
    • Q48 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy - - - Government Policy
    • Q49 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy - - - Other

    Statistics

    Access and download statistics

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:gam:jeners:v:13:y:2020:i:5:p:1099-:d:327105. See general information about how to correct material in RePEc.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: (XML Conversion Team). General contact details of provider: https://www.mdpi.com/ .

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    If CitEc recognized a reference but did not link an item in RePEc to it, you can help with this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service hosted by the Research Division of the Federal Reserve Bank of St. Louis . RePEc uses bibliographic data supplied by the respective publishers.