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An experimental investigation of new roughness patterns (dimples with alternative protrusions) for the performance enhancement of solar air heater

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  • Kumar, Rajneesh
  • Sharma, Akshay
  • Goel, Varun
  • Sharma, Rajesh
  • Sethi, Muneesh
  • Tyagi, V.V.

Abstract

Conventional solar air heater (SAH) has poor performance and in this work, an initiative has been taken to improve their overall performance with the help of a combined roughness pattern over the absorber plate. The experimental setup has been designed and fabricated having a rectangular duct with one heat-absorbing side (with roughness). The combination of dimple and protrusion roughness elements are arranged alternatively over the absorber plate for performance improvement of SAH. The precise placement of these roughness elements over the heat-absorbing side has been ensured with relative roughness pitch (RRP; P/e), print diameter to hydraulic diameter (d/D), and relative roughness height (RRH, e/D) which ranged from 10 to 20, 0.025–0.045, and 0.25 to 0.5, respectively. It is discovered with the experimental results that the thermal performance increases along with the pressure loss in the roughened SAH (rSAH). The heat flow increment is comparatively higher at the trailing and the leading edge of the dimple and the protrusion because of flow separation, reattachment, and flow impingement. The thermal performance is the highest while RRP, RRH, d/D are 10, 0.036, and d/D = 0.35, respectively. The proposed roughness pattern has resulted in a 2.1 and 1.95 times higher thermal augmentation and overall performance of SAH over the conventional.

Suggested Citation

  • Kumar, Rajneesh & Sharma, Akshay & Goel, Varun & Sharma, Rajesh & Sethi, Muneesh & Tyagi, V.V., 2023. "An experimental investigation of new roughness patterns (dimples with alternative protrusions) for the performance enhancement of solar air heater," Renewable Energy, Elsevier, vol. 211(C), pages 964-974.
    • Handle: RePEc:eee:renene:v:211:y:2023:i:c:p:964-974
    DOI: 10.1016/j.renene.2023.04.111
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    References listed on IDEAS

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    1. Kumar, Anil & Kumar, Raj & Maithani, Rajesh & Chauhan, Ranchan & Sethi, Muneesh & Kumari, Anita & Kumar, Sushil & Kumar, Sunil, 2017. "Correlation development for Nusselt number and friction factor of a multiple type V-pattern dimpled obstacles solar air passage," Renewable Energy, Elsevier, vol. 109(C), pages 461-479.
    2. Hwang, Sang Dong & Kwon, Hyun Goo & Cho, Hyung Hee, 2010. "Local heat transfer and thermal performance on periodically dimple-protrusion patterned walls for compact heat exchangers," Energy, Elsevier, vol. 35(12), pages 5357-5364.
    3. Kumar, Rajneesh & Varun, & Kumar, Anoop, 2016. "Thermal and fluid dynamic characteristics of flow through triangular cross-sectional duct: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 61(C), pages 123-140.
    4. Azadani, Leila N. & Gharouni, Nadiya, 2021. "Multi objective optimization of cylindrical shape roughness parameters in a solar air heater," Renewable Energy, Elsevier, vol. 179(C), pages 1156-1168.
    5. Goel, Varun & Kumar, Rajneesh & Bhattacharyya, Suvanjan & Tyagi, V.V. & Abusorrah, Abdullah M., 2021. "A comprehensive parametric investigation of hemispherical cavities on thermal performance and flow-dynamics in the triangular-duct solar-assisted air-heater," Renewable Energy, Elsevier, vol. 173(C), pages 896-912.
    6. Saini, R.P. & Verma, Jitendra, 2008. "Heat transfer and friction factor correlations for a duct having dimple-shape artificial roughness for solar air heaters," Energy, Elsevier, vol. 33(8), pages 1277-1287.
    7. Pedro J. Zarco-Periñán & Irene M. Zarco-Soto & Fco. Javier Zarco-Soto, 2021. "Influence of the Population Density of Cities on Energy Consumption of Their Households," Sustainability, MDPI, vol. 13(14), pages 1-15, July.
    8. Kumar, Rajneesh & Goel, Varun & Kumar, Anoop, 2018. "Investigation of heat transfer augmentation and friction factor in triangular duct solar air heater due to forward facing chamfered rectangular ribs: A CFD based analysis," Renewable Energy, Elsevier, vol. 115(C), pages 824-835.
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    Cited by:

    1. Ceylin Şirin & Azim Doğuş Tuncer & Ataollah Khanlari, 2023. "Improving the Performance of Unglazed Solar Air Heating Walls Using Mesh Packing and Nano-Enhanced Absorber Coating: An Energy–Exergy and Enviro-Economic Assessment," Sustainability, MDPI, vol. 15(21), pages 1-17, October.
    2. Kumar, Rajneesh, 2024. "Improved solar-thermal heat exchanger for space heating with surface roughness: A numerical parametric investigation and its optimization," Renewable Energy, Elsevier, vol. 226(C).

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