Published on March 7, 2014
Balancing Daylight & Energy
How should we measure daylighting? Daylight Factor ● Ratio of internal to external illuminance under overcast sky ● Used in early versions of LEED ● Pro: Simple annual metric ● Con: Inaccurate in most locales Graphic of Daylight Factor, by Max Pierson (http://www.maxwellrosspierson.com/)
How should we measure daylighting? Moment-in-time Illuminance ● Minimum illuminance levels at a point in time (e.g. min. 24 fc on Sept 21 at 9am and 3pm) ● Used in LEED 2009 ● Pro: Clear snapshot of performance ● Con: Not annualized Graphic of illuminance at 9am on Sept. 21, by Max Pierson (http://www.maxwellrosspierson.com/)
How should we measure daylighting? Dynamic metrics ● Use solar irradiances from a weather file ● Annualized (summary metric for an entire year) ● Used in LEED v4 ● Pro: accurate predictors Graphic of Daylight Autonomy, by Max Pierson (http://www.maxwellrosspierson.com/)
Daylighting Metrics in Sefaira for SketchUp Spatial Daylight Autonomy (sDA) ● How much of a space receives satisfactory daylight ● sDA300, 50% - Percent floor area that has at least 300 lux for at least 50% of the annual occupied hours
Daylighting Metrics in Sefaira for SketchUp Annual Sunlight Exposure (ASE) ● How much of a space receives too much direct sunlight ● Indicator of possible visual or thermal discomfort ● ASE1000, 250 - Percent floor area that has at least 1000 lux for at least 250 annual occupied hours
Daylighting Metrics in Sefaira for SketchUp ● Real-time feedback on daylighting (sDA) & glare (ASE) ● Enables trade-offs between energy & daylighting ● Uses cloud-based deployment of Radiance and DAYSIM
Learn more or Watch a demo www.sefaira.com
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