What happens if my WFA*VT is too large because my bay is only as deep as to the back wall? Do I have too much window and therefor don't have good daylighting?
WFA*VT Should be 0.15 to 0.18
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TODD REED
Energy Program SpecialistPA DMVA
LEEDuser Expert
890 thumbs up
August 18, 2011 - 8:52 am
The prescriptive method should not be used to determine whether you have good daylight or not. What if that space is north facing in a northern climate that has alot of overcast days? You may have to provide more glazing with a higher VLT to meet the daylight needs year round.
Since the prescriptive method is a general formula, the formula is what it is. You can try and break up the space into multiple daylight zones, but that may make it worse.
I would recommend simulation, there are some free downloads of daylight simulation programs such as SPOT that can help you. I would not change a design based on meeting the requirements of the prescriptive method.