Performance Characteristics of Three Sides Artificially Roughened Solar Air Heaters

This paper analyzes the performance characteristics of solar air heaters incorporating three artificially roughened sides, which demonstrate enhanced heat transfer capabilities. The objective is to compare the efficiency of these solar air heaters against standard models with smooth absorber plates under similar operational conditions. A comprehensive methodology is employed, building on prior research that has established the superior performance of roughened designs for fully developed turbulent flow conditions. The findings indicate that the proposed configuration significantly increases heat transfer compared to alternatives with only one roughened side. Detailed investigations into the thermo hydraulic performance reveal optimal configurations for maximizing heat transfer while minimizing friction losses. The paper underscores the importance of heat transfer coefficients, friction enhancement factors, and the overall thermal efficiency of solar air heaters. Results conclusively highlight the advantages of utilizing three-sided roughening in solar air heater designs, contributing valuable insights for improving solar thermal efficiency. These findings are pivotal for future developments in renewable energy technologies aimed at enhancing energy harnessing methods in solar applications.