现有建筑屋顶光伏改造的设计与综合评估

Abstract Optimizing photovoltaic (PV) retrofit and design strategies for existing buildings represents a pivotal step toward advancing low-carbon transitions and fostering sustainable development within the building sector. Nevertheless, achieving a harmonious balance between technological innovation, efficient building energy management, and financial feasibility remains a significant challenge. This study develops six new idealized integral PV roof thermal resistance models to quantitatively elucidate the relationships among installed PV capacity, installation angles, and resultant building energy consumption. Numerical simulations are employed to comprehensively evaluate year-round fluctuations in indoor temperatures, variations in energy consumption, and the PV power generation potential of buildings before and after retrofitting. The findings reveal that all retrofitting schemes reduce indoor temperatures and energy consumption during the summer. In contrast, winter results exhibit distinct thermal regulation characteristics, with indoor temperatures declining during the daytime and experiencing marginal increases at night. The 3 # 5 single-slope roof with PV Flat paving demonstrates the most superior retrofit performance. Notably, this configuration achieved an impressive annual carbon reduction of up to 128.90 tons of CO 2 , paving the way for innovative and highly efficient solutions in energy conservation and emission reduction for existing buildings.