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The solar air heater (SAH) harnesses solar energy and finds widespread application in various contexts, including drying agricultural products, heating spaces in buildings, etc. However, the viability... of SAH has a problematic issue due to its low performance, which limits its applicability in actual applications. In this work, two distinct novel turbulators; namely, S-shape and Airfoil (NACA0018) turbulator have designed to take advantage of their flow structures to get enhanced performance of SAHs. The thermal analysis of rectangular SAH with a combination of S-shape and Airfoil (NACA0018) shape turbulators performed numerically. The operating and geometric parameters are : relative pitch (P/e) varied from 8 to14, angle of attack (α) varied from 0°-45°, and Reynolds number (Re) varied from 4000-16000. Both heat transfer and friction factor characteristics of SAH with turbulators show a significant improvement over smooth SAH. The maximum value of thermos-hydraulic performance is 2.21 which has been achieved at P/e=12, Re=12000 and α=30º. The exergetic analysis was also conducted, yielding a maximum exergetic efficiency of 2.25%.続きを見る
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