Assessment of the discrepancy between daylight factor and using illuminance data methods by climate zones under EN:17037

Abstract

Conducting a rigorous evaluation of the daylight performance of buildings is essential for human health and energy efficiency. Today, there are two main methods used for analysis: the daylight factor, which been used since the early 1900s, and the newer approach known as climate -based modelling. methods are employed in the EN 17037 Daylight Buildings' standard. Utilizing different calculation methods causes discrepancies in daylight provision performance analyses of a room. However, there is definition or limitation for this subject in the standard. a result, researchers prefer different calculation methods for the same location in daylighting analyses without a clear justification. Additionally, there is a of parametric methods that follow the guidelines of standard. This study aims to analyse the impact calculation methods on daylighting analyses according to different regions and generate parametric methods compliance with the standard. In this respect, comparison calculations are conducted for a theoretical room situated in all 81 provinces of Turkey, where variant climate types occur over a year. Furthermore, parametric workflows are generated using Rhinoceros/Grasshopper following the directives of standard. The findings indicate that the method choice affects the illumination levels in all zones, ranging 15 to 114 %.