Numerical Analysis of Efficiency Improvement in Flat Plate Solar Collectors using Offset Strip Fins

This study aims to enhance the efficiency of flat plate solar collectors by integrating offset strip fins and utilizing Ansys Fluent for numerical analysis, validating results from a SolidWorks-designed solar air dryer. It outlines system components and objectives based on a standard model, supporting both theoretical and experimental analyses for applications in air conditioning and agro-food drying. Key boundary conditions, such as inlet temperature, air velocity, and absorber emissivity, were defined while maintaining experimental dimensions. Mesh tests ensured simulation accuracy for essential thermodynamic parameters, including outlet temperature and pressure, using the realizable k-epsilon turbulence model. The advanced model features obstacles that increase the heat transfer area by 53.6 % and create secondary turbulent flow. Staggered offset strip fins improved temperature by 12.6 % at an air velocity of 0.92 m/s (Re = 6000), significantly enhancing the overall effectiveness of the solar collector.