Evaluation of the effects of partition design on circadian daylighting in open-plan offices

Abstract

Due to the changes in the modern human lifestyle, the average time people spend in interior spaces has increased, which calls attention to providing appropriate indoor lighting. Many studies have shown the considerable influence of luminous conditions on human circadian rhythm, productivity, and well-being. While the influence of a building’s architectural characteristics on the visual aspects of daylight has been extensively examined in the literature, there has been comparatively less emphasis on assessing these affects within the context of circadian daylighting considerations. The current study has employed a simulation-based approach to investigate the influence of interior space configurations; in particular, office space’s partition layout, height, and optical properties on the circadian potential of the space. Specifically, the study aimed to examine the impact of two partition layouts – arranged perpendicular and parallel to the window – alongside nine different materials featuring various color hues and reflection levels, and three distinct partition heights. Results indicate that, generally, the circadian potential of the office space rises with the increase of the melanopic reflectance of the partition material and the decrease of partition height. With partitions higher than the eye level, arranging them in a parallel position to the window would result in a better non-visual environment, whereas with lower partition heights, the perpendicular arrangement of partitions to the window would be a more suitable choice in most of the investigated cases. This study suggests a decision-making model to assist designers in creating efficient office spaces, particularly in terms of circadian lighting conditions.