Abstract
The increasing trend of employing glazed façades to utilize daylight in the buildings has made it necessary to develop measures to avoid excessive sunlight penetration in such daylit spaces. In Thailand, only a few studies have focused on daylight glare, and therefore, applicable criteria are required to fulfill the local preference. This study aimed to determine daylight glare thresholds on the basis of the occupants’ responses. A post-occupancy evaluation with a simplified daylight glare probability (DGPs) model was performed in eight open-plan office spaces located in Bangkok, Thailand. The occupants participated in a survey including a subjective questionnaire; the results showed that the DGPs model performed effectively for glare prediction, with a preference for a lower level than that found in the current references. Statistical analysis helped mark the threshold values for each glare sensation level: imperceptible–perceptible = 0.22; perceptible–disturbing = 0.24; and disturbing–intolerable = 0.26. The findings of this study can be considered as initial evidence for improving the understanding of local occupants’ perspectives and illumination standards, which currently encourage daylight utilization without any specific glare control strategies.
Highlights
As the trend of glazed façades continues to increase [1], the façades themselves remain the main source that can cause negative effects on buildings
The occupants worked inside daylit office spaces, located in an urban area of Bangkok, Thailand
With respect to the index of visual comfort probability (VCP) introduced by Guth [52] to evaluate the percentage of the observers’ population who would be considered comfortable in a given lighting environment, we found that the suggestion is strictly higher than 70% to ensure occupants achieve visual comfort
Summary
As the trend of glazed façades continues to increase [1], the façades themselves remain the main source that can cause negative effects on buildings. Being one of the most vulnerable elements, glazed façades have usually represented a critical aspect in building design because, if not properly conceived, they can have an impact on energy demands. Office buildings are gaining popularity globally, and in Southeast Asia. In Thailand, growth in new office spaces is predicted, owing to the high regional economic growth [5]. These newly constructed offices are expected to contribute positively to their inhabitants by assessing the occupants’
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