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In this study, the TRNSYS simulation engine was used to investigate the shading and cooling effect of roof-added photovoltaics (PV). The local weather conditions were introduced in the data reader component. The sol-air effective temperatures were modeled in the roof–air boundary layer, while a single-zone model was used for the heat transfer calculation, both in bared and PV-shaded roof. The simulation was validated by experimental data of a PV installation at the roof of the Department of Environmental & Natural Resources Management. The simulation results show that PV panels have a high impact on the roof surface temperature between shaded and exposed parts of the roof during the summer time. Heat transfer simulation with or without roof-integrated PV shadings revealed the factors influencing cooling loads of a building during the year. The roof-added PV can passively reduce the daily rooftop cooling energy and peak load during the hot summer days in addition to electricity production.
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Kapsalis et al. (2014) studied this question.
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