The Effect Of Window-to-wall Ratio On Energy Consumption And Visual Comfort Of Office Buildings In Cold Regions Of China

The window-to-wall ratio of the outside wall can affect indoor environment and energy.At present the research on window-to-wall ratio most associated with energy consumption,and the study of multi-objective is less,especially the human subjective evaluation window-to-wall ratio than the less.This paper study focusing on the impact of window-to-wall ratio on the energy consumption,indoor visual comfort and subjective preferences of office buildings in Tianjin,China.Annual energy consumption for cooling,heating and lighting was calculated using the DesignBuilder Software in terms of different window-towall ratios.Indoor visual environment was calculated using the DAYSIM software.Daylight Autonomy(DA),Useful Daylight Illuminance(UDI)and Maximum Daylight Autonomy(DAmax)were used to evaluate indoor visual comfort conditions.Furthermore,the preferences for window-to-wall ratio in office buildings were investigated in the chamber of the Sustainable Building Environment Research Center(SBERC)of Tianjin University.Finally,the study summarized the influence of window-to-wall ratio on energy consumption,visual comfort and satisfaction of participants and presented appropriate range of window-to-wall ratio as well as corresponding strategies for the four directions of office building in cold climate of China.