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CI-2009 IEQc8.1: Daylight and Views—Daylight
January 9, 2010
24 thumbs up
In the CI reference manual the calculation for Daylight factor is as follows:
Daylight Factor = (Window area/floor area) x Window Geometry x (Actual Tvis/Min Tvis) x Window Height Factor.
Can someone enlighten me as to how to find the "Actual Tvis" of our glazing?
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11474 thumbs up
January 12, 2010 - 5:09 pm
Tvis is the same as "visible light transmittance" or simply "visible transmittance" and should be found in your glazing specifications or cut sheets. It's a standard measurement—not something you should have to guess at.
Does that help?
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