In the present study, the aim is to model and optimize the photovoltaic/thermal system (PVT) to achieve the highest thermal and electrical efficiencies by considering the physical characteristics. To model the proposed system, the governing relations were derived by considering the desired variables. Then to use the modeling, the validation of the code was done with a valid source, for which the variables of cell surface temperature, a bottom surface, and output fluid were used. After validation, it was observed that the proposed model has good accuracy to achieve the desired goals. To achieve maximum output power by the cell, open circuit voltage and short circuit current for this system was calculated for one day that has the highest radiation intensity, for which the highest voltage and current are 9.3 V and 6.7 A, respectively. Then, after extraction of voltage and short circuit current for the studied cell, the amount of thermal and electrical efficiencies was determined to be 40% and 10%, respectively. In the next step of this research, optimization is performed to achieve the highest efficiency, which is 67% for this system. تفاصيل المقالة