The Relationship Between Daylighting Performance and Energy Consumption Based on Window Types in Office Buildings

Purpose: The objective of this study is to identify the optimal window types by comprehensively considering the relationship between daylighting performance and energy consumption to improve the indoor light environment of office buildings and reduce building energy consumption. Method: A prototype was established using the average model of the south-facing floors of 82 buildings along Teheran-ro. The Climate Studio simulation program was used to compare and analyze the daylighting performance of each window type using Daylight Factor, Spatial Daylight Autonomy, Annual Sunlight Exposure, and the total energy consumption for cooling, heating, and lighting. Result: The Vertical Right side window was identified as the optimal window type in the Window to Wall Ratio 30%, and the Horizontal Mixing 7 separation window and the Vertical Right side window were identified as the optimal window type in the Window to Wall Ratio 60%. It was found that window types meeting the daylighting performance criteria may result in slightly higher energy consumption. Therefore, it is not advantageous to determine window types solely based on daylighting performance without considering the energy aspect, highlighting the need to analyze both daylighting performance and energy consumption together.