Optimization Potential of Side-Lit Windows for Energy and Daylight Performance of University Classrooms in Shanghai

University classrooms have an urgent need for energy saving and environmental optimization due to the energy consumption characteristics and the demand for a daylight environment. Classrooms in hot summer and cold winter (HSCW) areas in China are typically designed with a south-facing layout, but the indoor environment of the classrooms in actual use is not as satisfactory as it should be. This research examines the impacts of side-lit window design parameters and shading forms on the energy and daylight performance by using measurements and simulation. It is found that there is significant seasonal variation in the energy consumption of teaching buildings in HSCW areas, with cooling energy consumption being the primary focus of energy conservation. Additionally, appropriate shading measures can not only compensate for the energy deficiencies of the orientation and window-to-wall ratio (WWR), but also considerably enhance the indoor daylight conditions. The results indicate that the most effective way to optimize energy and daylight performance in classrooms is to adopt a north-facing layout with 400 mm shading louvers. The illuminance level of the working plane can be made more uniform and the useful daylight illuminance (UDI) can be increased to over 60%. Therefore, classroom designs in HSCW areas can be more flexible in terms of optimizing energy efficiency and daylight conditions by integrating various design parameters and shading measures.

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