Numerical investigation of heat transfer enhancement in solar air heaters using polygonal-shaped ribs and grooves
Solar air heating thermal systems have found extensive utilization in a broad array of industrial and residential settings, playing a pivotal role in the conversion and reclamation of solar energy. Implementing repeated artificial roughness in the surfaces has the potential to augment thermal perfor...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2023-11-01
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| Series: | Frontiers in Energy Research |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fenrg.2023.1279225/full |
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| author | B. Varun Kumar Chithirai Pon Selvan P. Rajesh Kanna Dawid Taler Magdalena Szymkiewicz Jan Taler |
| author_facet | B. Varun Kumar Chithirai Pon Selvan P. Rajesh Kanna Dawid Taler Magdalena Szymkiewicz Jan Taler |
| author_sort | B. Varun Kumar |
| collection | DOAJ |
| description | Solar air heating thermal systems have found extensive utilization in a broad array of industrial and residential settings, playing a pivotal role in the conversion and reclamation of solar energy. Implementing repeated artificial roughness in the surfaces has the potential to augment thermal performance in solar air heaters (SAHs). This study presents a numerical investigation of SAHs with artificial rough surfaces, consisting of polygonal-shaped ribs and grooves located at different places inside the rectangular duct, that improve thermal efficiency. ANSYS Fluent software was employed to simulate the SAH with different relative pitch distances of p = 10 mm and 20 mm and relative rib heights e/d = 0.09–0.045. The working fluid air flows at different Reynolds numbers (Re), ranging from 3,800 to 18,000. Nusselt number (Nu), friction factor (f), and Thermal Hydraulic Performance (THP) are parameters to evaluate the performance of the SAH. The renormalized group (RNG) k-ϵ turbulent model was implemented in this simulation. The study outcomes indicate that increasing the rib height improves the heat transfer rate and nonetheless increases pressure drop while increasing the pitch distance. The higher Nusselt number (Nu) is 3.762 attained at p = 10 mm and 3.420 at p = 20 mm in the center-positioned rib at Re 3,800. The lower friction factor (ƒ) obtained in p = 20 mm is 1.681 and 0.785 in p = 10 mm in the staggered positioned rib at higher Re 15,000. The optimal THP was achieved at 2.813 at a staggered rib height at a pitch distance of p = 10 mm at Re 8,000. The study’s findings suggest that the incorporation of artificial rough surfaces has the potential to enhance the THP of an SAH. |
| first_indexed | 2024-03-09T14:22:51Z |
| format | Article |
| id | doaj.art-8725b71fc0344e09a22141938b24dfdc |
| institution | Directory Open Access Journal |
| issn | 2296-598X |
| language | English |
| last_indexed | 2024-03-09T14:22:51Z |
| publishDate | 2023-11-01 |
| publisher | Frontiers Media S.A. |
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| series | Frontiers in Energy Research |
| spelling | doaj.art-8725b71fc0344e09a22141938b24dfdc2023-11-28T09:08:52ZengFrontiers Media S.A.Frontiers in Energy Research2296-598X2023-11-011110.3389/fenrg.2023.12792251279225Numerical investigation of heat transfer enhancement in solar air heaters using polygonal-shaped ribs and groovesB. Varun Kumar0Chithirai Pon Selvan1P. Rajesh Kanna2Dawid Taler3Magdalena Szymkiewicz4Jan Taler5Velammal College of Engineering and Technology, Madurai, IndiaHead of School Science and Engineering, Curtin University, Dubai, United Arab EmiratesCO2 Research and Green Technologies Centre, Vellore Institute of Technology, Vellore, IndiaDepartment of Thermal Processes, Air Protection and Waste Utilisation, Cracow University of Technology, Cracow, PolandDepartment of Thermal Processes, Air Protection and Waste Utilisation, Cracow University of Technology, Cracow, PolandDepartment of Energy, Cracow University of Technology, Kraków, PolandSolar air heating thermal systems have found extensive utilization in a broad array of industrial and residential settings, playing a pivotal role in the conversion and reclamation of solar energy. Implementing repeated artificial roughness in the surfaces has the potential to augment thermal performance in solar air heaters (SAHs). This study presents a numerical investigation of SAHs with artificial rough surfaces, consisting of polygonal-shaped ribs and grooves located at different places inside the rectangular duct, that improve thermal efficiency. ANSYS Fluent software was employed to simulate the SAH with different relative pitch distances of p = 10 mm and 20 mm and relative rib heights e/d = 0.09–0.045. The working fluid air flows at different Reynolds numbers (Re), ranging from 3,800 to 18,000. Nusselt number (Nu), friction factor (f), and Thermal Hydraulic Performance (THP) are parameters to evaluate the performance of the SAH. The renormalized group (RNG) k-ϵ turbulent model was implemented in this simulation. The study outcomes indicate that increasing the rib height improves the heat transfer rate and nonetheless increases pressure drop while increasing the pitch distance. The higher Nusselt number (Nu) is 3.762 attained at p = 10 mm and 3.420 at p = 20 mm in the center-positioned rib at Re 3,800. The lower friction factor (ƒ) obtained in p = 20 mm is 1.681 and 0.785 in p = 10 mm in the staggered positioned rib at higher Re 15,000. The optimal THP was achieved at 2.813 at a staggered rib height at a pitch distance of p = 10 mm at Re 8,000. The study’s findings suggest that the incorporation of artificial rough surfaces has the potential to enhance the THP of an SAH.https://www.frontiersin.org/articles/10.3389/fenrg.2023.1279225/fullrough surfacepolygonal rib with grooveTHPsolar air heaterNusselt numbernumerical simulation |
| spellingShingle | B. Varun Kumar Chithirai Pon Selvan P. Rajesh Kanna Dawid Taler Magdalena Szymkiewicz Jan Taler Numerical investigation of heat transfer enhancement in solar air heaters using polygonal-shaped ribs and grooves Frontiers in Energy Research rough surface polygonal rib with groove THP solar air heater Nusselt number numerical simulation |
| title | Numerical investigation of heat transfer enhancement in solar air heaters using polygonal-shaped ribs and grooves |
| title_full | Numerical investigation of heat transfer enhancement in solar air heaters using polygonal-shaped ribs and grooves |
| title_fullStr | Numerical investigation of heat transfer enhancement in solar air heaters using polygonal-shaped ribs and grooves |
| title_full_unstemmed | Numerical investigation of heat transfer enhancement in solar air heaters using polygonal-shaped ribs and grooves |
| title_short | Numerical investigation of heat transfer enhancement in solar air heaters using polygonal-shaped ribs and grooves |
| title_sort | numerical investigation of heat transfer enhancement in solar air heaters using polygonal shaped ribs and grooves |
| topic | rough surface polygonal rib with groove THP solar air heater Nusselt number numerical simulation |
| url | https://www.frontiersin.org/articles/10.3389/fenrg.2023.1279225/full |
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