High efficiency absorber with perforated plate for solar air collector

Jet impingement is one of the convective heat transfer methods to transfer heat from a surface to the flowing fluid. This method can be used for many applications as enhancement method to increase the overall performance. The main objective of this research is to study the thermal performance of solar collector under different solar radiation by using jet impingement method. A solar air collector with jet impingement design was fabricated and tested. A perforated plate of 6mm holes diameter with triangular geometry was designed and installed into the solar air collector. The effect of different irradiance on the rise of temperature was applied to evaluate the thermal performance. The fixed mass flow rate of 0.0076 kg/s was used in the test. It was found that temperature difference between inlet and outlet increases with irradiance. The highest and lowest efficiencies were measured to be 80.40% and 69.60% respectively. From the study, it showed that there are slight increases of thermal efficiency as the solar irradiance increases.