Performance improvement of solar air heater with v-baffles on absorber plate

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Published: Jul 25, 2018
Keywords:
V-baffle Solar air heater Artificial roughness Heat transfer

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P. Hoonpong
Department of Industrial Technology, Faculty of Industrial Technology, Thepsatri Rajabhat University, 321 Naraimaharat Road, Talaychubsorn, Lopburi 15000, Thailand
S. Skullong
Energy Systems Research Group, Department of Mechanical Engineering, Faculty of Engineering at Sriracha, Kasetsart University Sriracha Campus, 199 M.6, Sukhumvit Rd., Sriracha, Chonburi 20230, Thailand

Abstract

The article deals with an experimental study on heat transfer and flow friction characteristics in a solar air heater duct roughened artificially with V-shaped baffles. The absorber plate is mounted with V-baffle vortex generators to improve the performance of the solar thermal system for energy saving. The experiment in the test duct having the aspect ratio (AR) of 10 is conducted for Reynolds number (Re) based on the hydraulic duct diameter ranging from 5300 to 22,600. In the current work, V-baffles are placed on the absorber with three relative baffle heights (RB=b/H = 0.1, 0.2 and 0.3) and pitches (RP= P/H = 0.5, 1.0 and 1.5) at a single attack angle (b) of 60°. The experimental results reveal that the use of V-baffle vortex generators yields the considerable increase in heat transfer over the smooth duct around 2.32–4.3 times while the friction loss increases around 4.08–36.9 times. The heat transfer and the friction loss tend to rise for increasing RB but show the reversing trend for increasing RP. The maximum thermal performance for the V-baffle vortex generators around 1.57 is seen at RB = 0.2 and RP = 1.0.

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How to Cite
Hoonpong, P., & Skullong, S. (2018). Performance improvement of solar air heater with v-baffles on absorber plate. Journal of Research and Applications in Mechanical Engineering, 6(1), 29–39. Retrieved from https://ph01.tci-thaijo.org/index.php/jrame/article/view/136535
Issue
Vol. 6 No. 1 (2018)
Section
RESEARCH ARTICLES

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