Abstract
A solar air collector (SAC) is a heating device that applies warm air to dry agricultural products and for a variety of engineering purposes. The underside of the absorber plate used discrete double arc reverse shaped artificial roughness, outside testing performance for heat transfer coefficient, h, and thermal efficiency, ηth features of solar air collector were carried out in this article. During the outdoor experimental test, the following parameters were used: relative roughness pitch (p/e) = 8.33, relative roughness height (e/Dh) = 0.027, arc angle (α) = 60°, Reynolds Number (Re) = 3000 to 14000, and aspect ratio (W/H) = 8. Also, the outdoor test was performed at 11:00 A.M. before noon to 2:00P.M. afternoon with solar radiation intensities ranging from 860 W/m2 to 895 W/m2. The impact of various factors on heat transmission and thermal efficiency is compared to that of a smooth absorber duct under identical conditions of flow. Over the smooth duct, the maximum increases in coefficient of heat transfer and thermal efficiency are 2.88 and 1.29 times, respectively.
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