Abstract: Abstract: In the process of building design, the window-to-wall ratio has noticeable effect on the energy consumption of indoor air conditioning and lighting. It is significant to control the window-to-wall ratio in a reasonable range for building energy saving. Aiming at the problem of window-to-wall ratio selection in Revit modeling process, this paper studies the calculation method of window-to-wall ratio. Based on the limit value of window-wall ratio given in Design Standard for Energy Efficiency of Public Buildings (GB50189-2015), Revit is redeveloped by C# language. The software of automatic enumeration algorithm of window-to-wall ratio is compiled and integrated into Revit to check the compliance of window-to-wall ratio in Revit model. The software is tested on an office building in Shanghai. The results show that the software can automatically obtain the ratio range of window-to-wall ratio in the building location, calculate the window-to-wall ratio of each facade of the current model and conduct the comparison. When it does not meet the specifications, the software can quickly adjust it to the norm range, and evaluate whether the optimized ratio of window area of each facade meets the requirements.

Key words: Keywords: window-to-wall ratio, building information modeling, automatic calculation