Influence of the window-wall ratio on energy consumption of civil constructions in hot summer and cold winter region

According to the hourly typical meteorological year data in Nanjing, the dynamical heating and cooling load of building envelope is analyzed using MATLAB and based on dynamic thermal response factor method of walls. The law of the influence of the window-wall ratio ranging from 0.2 to 0.7 on the total annual energy consumption of heating and cooling is also studied, as well as the total electricity consumption of the building under the conditions of different orientations Oust take south and north as examples) and different window types. The result shows that the increase of north-facing window-wall ratio leads to the increase of the total energy consumption of heating and cooling. As to double-glazed PVC plastic windows, the increase of south-facing window-wall ratio is followed by a decrease annual energy consumption. Therefore, double-glazed PVC plastic windows are suggested to be used to cut the energy consumption in Nanjing.