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Impact of various cross-sectional flow passages on the performance of a solar-based thermal energy conversion system

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  • Kumar, Rajneesh

Abstract

Higher energy demand has motived the researchers for exploring sustainable alternatives like freely available solar energy for space heating and drying applications. In this investigation, three different designs (triangular, triangular with rounded corners, and rectangular) has been proposed and compared with each other for finding the best. The primarily objective of this study is to analyze the effect of different shaped flow-passages on the thermohydraulic performance of the solar air heat. The heat absorbing side i.e. absorber plate is fabricated with the hemispherical roughness elements on it to improve the overall performance. The computational fluid dynamics-based model is developed and solution is simulated with a help of Fluent software. The RNG κ-ɛ model was chosen for turbulence. Results show that rounded corners (SAH-2) offer the best heat transfer for low Reynolds numbers (Re < 12,000), exceeding rectangular (SAH-3) and triangular (SAH-1) by 68 % and 30 %, respectively. However, for higher Reynolds number (15,000–20,000), rectangular passages (SAH-3) deliver the highest thermal-hydraulic performance (THP) of 2.2 (at Re 5600). Therefore, rounded corners are ideal for lower flow rates, while rectangular designs excel at higher flow rates.

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  • Kumar, Rajneesh, 2024. "Impact of various cross-sectional flow passages on the performance of a solar-based thermal energy conversion system," Renewable Energy, Elsevier, vol. 234(C).
    • Handle: RePEc:eee:renene:v:234:y:2024:i:c:s0960148124012175
    DOI: 10.1016/j.renene.2024.121149
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    References listed on IDEAS

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    1. Alam, Tabish & Kim, Man-Hoe, 2018. "A comprehensive review on single phase heat transfer enhancement techniques in heat exchanger applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 81(P1), pages 813-839.
    2. 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.
    3. Kumar, Vikash, 2019. "Nusselt number and friction factor correlations of three sides concave dimple roughened solar air heater," Renewable Energy, Elsevier, vol. 135(C), pages 355-377.
    4. Alam, Tabish & Kim, Man-Hoe, 2017. "A critical review on artificial roughness provided in rectangular solar air heater duct," Renewable and Sustainable Energy Reviews, Elsevier, vol. 69(C), pages 387-400.
    5. Salman, Mohammad & Chauhan, Ranchan & Poongavanam, Ganesh Kumar & Kim, Sung Chul, 2022. "Analytical investigation of jet impingement solar air heater with dimple-roughened absorber surface via thermal and effective analysis," Renewable Energy, Elsevier, vol. 199(C), pages 1248-1257.
    6. 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.
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