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Solar thermal collector is a simple, economic, and environment friendly equipment which is used to utilize solar energy for various agriculture and industrial applications. The investigators mainly focus on the improvement of the thermal performance by providing various fins shapes underside of the absorber plate in the single pass and double pass solar thermal collector. This work discusses the influence of different shaped fins used by various researchers in improving the thermal performance of thermal collectors. Fin's design, geometries used, and their influence on turbulence and thermal performance have also been discussed. As per the literature review and comparative study the heat transfer rate is greater for solar air thermal collector with fins as compared to solar air thermal collector without fins.

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Influence of wind speed, mass flow rate of water, irradiance and ambient temperature on concentrated Photovoltaic thermal module equipped with linear FL as Primary Optic Element and Convex Lens as Secondary Optic Element have been investigated in this study. Influence of these parameters on module performance in terms of thermal efficiency and electrical efficiency are also examined during investigation. The thermal efficiency and electrical efficiency without consideration of parameters was found to be 14.3% and 51.2 % respectively. With consideration of above mentioned four parameters, the results reveal that electrical efficiency of 17.2% and thermal efficiency of 55.3% can be achieved for designed setup. Thus, there is 20% and 8% increase in electrical efficiency and thermal efficiency respectively. The electrical efficiency increases with increase in fluid flow rate, wind speed and irradiance. Electrical efficiency decreases with increase in ambient temperature. The thermal efficiency increases with increment in water mass flow rate, irradiance and ambient temperature. However, with increase in wind speed, the thermal efficiency decreases.

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