A dynamic model is developed to analysis the transient characteristics of hybrid photovoltaic/thermal solar energy system. Two typical climatic conditions, clear day and hazy day, are considered in the present study. The daily and annual variation of hot water temperature, electrical output, thermal efficiency and electrical efficiency are calculated and analyzed. The results show that the solar irradiance is the critical factor that affects the variation of the water temperature, electrical output and electrical efficiency of the PV/T system. The thermal efficiency of the system has also a certain relation to the daily fluctuation of solar radiation.

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