Requirement and deficiency of fossil fuels are increasing day by day due to the continuous usage for various applications. In this paper flat plate solar collector with and without straight fin has been analyzed by analytical and numerical approach with dissimilar working medium such as air and water. Four conditions are considered for the investigation of the enhancement of heat transfer in the flat plate solar collector. Results are validated by the comparison and found the best one based on

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... he heat transfer rate and thermal efficiency of the collector. Maximum efficiency of 26.09 % and 27.89 % were obtained for water with fins through analytical and numerical approach respectively when compared with air as a working medium.