Study on solar heat gain coefficient and air conditioning load of external window shading systems

 In order to study the variation of solar heat gain coefficient（SHGC）in the whole year and the influence of the window shading system on the air conditioning load, taking Nanjing as an example, studies the change rule of SHGC of the window in 12 months of the year, the annual SHGC of three kinds of external window shading systems in different orientation angles, and the influence of window shading systems on the room air conditioning load. The research results show that the difference of monthly SHGC of the south facing window is up to 0.10, and the SHGC in summer is 13% lower than that in winter. The air conditioning energy saving effect of the external window system with central roller shutter and external horizontal shutter is better. In addition, the annual SHGC of the window shading system has a positive correlation with the total energy consumption of air conditioning, and the annual cumulative load reduction rate of the air conditioning of the south facing window with central roller shutter and built-in blinds is higher than that of the west facing window with the same sunshade.