Abstract
In this study, a numerical model is proposed via MATLAB software to respond to the dynamic indoor heating and cooling loads. This model combines spectral splitting PV/T systems and sky radiative cooling to achieve switchable heating, cooling, and electricity harvesting. Especially in the summer, the application of sky radiation cooling technology can lower the energy consumption of buildings. Meanwhile, the outdoor parameters and the operating factors are studied to explore the effects on the electric power and cooling power. Results indicate the threshold value of solar radiation for running daytime mode or nighttime mode is vital to output performance, and the optimal threshold value is recommended as 150W/m2 to regulate the switchable system. The flow velocity affects the convective heat transfer effects between the flowing water and the glass. As the flow velocity increases from 0.0005m/s and 0.0040m/s, the mean electric power improves from 41.3W to 54.1W and the cooling power improves from 62.6W to 96.4W respectively. Hence, it is suggested to employ a flow velocity of 0.0040 m/s to augment the system's capacity and adopt a channel thickness of 5mm, which can effectively reduce material costs without substantially compromising the power output.
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