Akademik Veri Yönetim Sistemi
International Journal of Heat and Fluid Flow, cilt.116, 2025 (SCI-Expanded)
This study investigates the energy and exergy performance of a solar air heating system designed with a novel vertical configuration incorporating rows of 50 internal obstacles, developed to enhance thermal efficiency in building applications. Experimental tests were performed under real outdoor conditions to evaluate both thermal and exergetic behavior. The results showed that solar radiation and ambient temperature followed typical diurnal trends, with peak solar irradiance reaching approximately 740 W/m2 and ambient temperatures rising to 30 °C during midday. The maximum thermal efficiency of the system with obstacles was recorded at 82 %, which is notably higher than values reported in previous studies, such as 72 % and 73.31 % for systems enhanced with nano-coated absorbers. Furthermore, the system with internal obstacles maintained a significantly higher useful heat gain compared to the configuration without obstacles, especially during late afternoon hours when solar radiation declined, demonstrating improved thermal inertia and sustained performance. The exergetic efficiency values ranged between 0.01 and 0.22, aligning with trends observed in earlier literature, and reflecting the inherent limitations of low-temperature solar systems in converting available energy into work. Integration of the enhanced solar air heater into a prototype test room resulted in a more stable and uniform indoor temperature distribution, with a temperature difference of approximately 6 °C compared to the baseline system. These findings suggest that the proposed configuration not only improves energy capture and retention but also contributes to passive thermal comfort in buildings, thereby addressing a key gap in the development of sustainable, energy-efficient heating technologies.