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NC-2009 IEQc8.1:Daylight and Views—Daylight

Prescriptive approach - adjusting VLT for an overhang

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Ramana Koti
Sustainable Design Leader
HKS, Inc.
LEEDuser Basic Member
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Greetings all. One one of our LEED projects, we're using the prescriptive approach of VLT*WFR falling within the range of 0.15 and 0.18. When the actual VLT of the glazing, 0.64 is used, VLT*WFR amounts to 0.32. However, the windows have a really large overhang. Is there a scientifically accepted method for adjusting the VLT to account for such an overhang (just like the ASHRAE projection factor method to adjust the SHGC for an overhang)?

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Wed, 06/27/2012 - 20:43

No. You must use either the simulation or measurement options.

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