Abstract
Current study investigates parametric study on thermal performance of a rhombus-shaped artificially roughened absorber plate (RAP) used in solar air collector. Experimental investigations were performed in month of April–May 2024 in mechanical department of MANIT, Bhopal. Relative roughness pitch (P/e), relative roughness height (e/Dh), number of elements (W/Vr) and relative diagonal length (dr/e) in the range of 8–12, 0.0225–0.03375, 9–11, and 8–12 respectively are used as geometrical parameters for current study. Reynolds number (Re) is varied from 2000 to 14000. Thermal efficiency (ղth) is reported in terms of collector heat removal factor (FR), and collector efficiency factor (F′). A significant enhancement in ղth has been observed, ranging from 1.42 to 1.63 times higher when compared to the performance data of smooth plates. Maximum ղth of 79.48% was found at P/e = 10, e/Dh = 0.03375, W/Vr = 10, dr/e = 9.6 at mass flow rate (m˙) = 0.031 kg/s. Collector's performance parameter are reported as (FRτα) and (F0UL). value of (FRτα) and (F0UL) is reported 0.8612 and 15.82 for rhombus shape at optimal geometrical parameters.
Published Version
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