“Natural light is the only light because it has mood… it puts us in touch with the eternal. It is the only light that makes architecture.”—Louis Khan (Baker and Steemers, Daylight design of buildings: a handbook for architects and engineers 1–250, 2014; Tango, Object in light: from power to purpose, 2011). Daylight is one key aspect that enhances the sense of place and influences the personal interpretations and impressions that last long after leaving the place. However, visual discomfort and glare can distract architects from maximizing daylighting. To better achieve visual comfort in dynamic daylit spaces, the time and space dynamics of daylight conditions and the representation and re-imagining of these dynamics need to be considered. This paper examines logical argumentation through the exploration of various visual comfort metrics. The argument investigates several factors that affect visual performance and occupants' comfort. Some of these factors include lighting level, uniformity of illuminance, color rendering, avoiding hard shadows, contrast rendition, physiological glare, balanced brightness distribution, luminance levels variation, discomfort glare, illuminance uniformity in the area around the visual task, and the balance between artificial lighting and daylight. The argumentation concludes with a compilation of different visual comfort evaluation metrics. These metrics aim to consider the two fundamental dynamics of daylighting, time and movement through spaces, to achieve adequate daylighting performance with the most visual comfort. The research outcomes are expected to provide researchers, designers, and decision-makers with a new approach to designing to improve visual comfort, energy performance, and the quality of the place.

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Evaluating Visual Comfort Metrics in Dynamic Daylit Spaces: Challenges and Opportunities

  • Dalia Hafiz

摘要

“Natural light is the only light because it has mood… it puts us in touch with the eternal. It is the only light that makes architecture.”—Louis Khan (Baker and Steemers, Daylight design of buildings: a handbook for architects and engineers 1–250, 2014; Tango, Object in light: from power to purpose, 2011). Daylight is one key aspect that enhances the sense of place and influences the personal interpretations and impressions that last long after leaving the place. However, visual discomfort and glare can distract architects from maximizing daylighting. To better achieve visual comfort in dynamic daylit spaces, the time and space dynamics of daylight conditions and the representation and re-imagining of these dynamics need to be considered. This paper examines logical argumentation through the exploration of various visual comfort metrics. The argument investigates several factors that affect visual performance and occupants' comfort. Some of these factors include lighting level, uniformity of illuminance, color rendering, avoiding hard shadows, contrast rendition, physiological glare, balanced brightness distribution, luminance levels variation, discomfort glare, illuminance uniformity in the area around the visual task, and the balance between artificial lighting and daylight. The argumentation concludes with a compilation of different visual comfort evaluation metrics. These metrics aim to consider the two fundamental dynamics of daylighting, time and movement through spaces, to achieve adequate daylighting performance with the most visual comfort. The research outcomes are expected to provide researchers, designers, and decision-makers with a new approach to designing to improve visual comfort, energy performance, and the quality of the place.