Performance Assessment of Solar Air Heater Channel with Inclined Groove Turbulators

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dc.contributor.authorKoolnapadol, N.
dc.contributor.authorPromvonge, P.
dc.contributor.authorKhanoknaiyakarn, C.
dc.contributor.authorPromthaisong, P.
dc.contributor.authorHoonpong, P.
dc.contributor.authorChaimanatsakun, A.
dc.contributor.authorGururatana, S.
dc.contributor.authorSkullong, S.
dc.date.accessioned2026-08-06T10:51:14Z
dc.date.available2026-08-06T10:51:14Z
dc.date.issued2025-05-19
dc.description.abstractAn experimental investigation was carried out to explore the thermal performance and frictional loss features in a solar air heater (SAH) channel that was intentionally roughened on the absorber surface using multiple inclined groove turbulators. The working fluid, air, flows into the SAH channel, which has a consistent surface heat flux for Reynolds numbers (Re) varying between 5290 and 22,600 in the current research. Thermal characteristics at a single inclination angle (a = 45°) are investigated in this research by comparing the effects of three distinct relative groove frequencies (P/H=PR=0.8, 1.2 and 1.6) and groove depth ratios (D/H=DR=0.16, 0.24 and 0.32). The findings highlight that the employ of inclined grooves results in a noticeable rise in Nusselt number (Nu) from 1.24 to 2.82 times relative to the smooth absorber plate (smooth channel), as well as a 1.88 to 7.9 times increase in friction factor (f). The Nu and f show an increasing trend when Re increases, whereas the opposite pattern occurs as DR and PR increase. At PR = 0.8 and DR = 0.32, the inclined groove roughness has the largest thermal effectiveness factor (TEF) of around 1.64. The Nu and f correlations, which are functions of inclined groove features, have also been established.
dc.identifier.citationJournal of Research and Applications in Mechanical Engineering, 13(2), 2025
dc.identifier.doi10.14456/jrame.2025.16
dc.identifier.issn22292152
dc.identifier.other2-s2.0-105006750922
dc.identifier.urihttps://dspace.kmitl.ac.th/handle/123456789/17002
dc.sourceJournal of Research and Applications in Mechanical Engineering
dc.subjectHeat transfer
dc.subjectInclined groove
dc.subjectSolar air heater
dc.subjectThermal performance
dc.titlePerformance Assessment of Solar Air Heater Channel with Inclined Groove Turbulators
dc.typeArticle

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