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Daylighting - EA

Successful daylighting can be achieved with an effective aperture (EA) of between 0.20 - 0.30. Which of the following provides an EA within this range?
1. 105 sf net glazing area with visible light transmittance (VLT) of 0.38, in a space whose gross exterior wall area is 150 sf
2. 100 sf net glazing area with VLT of 0.53, in a space whose gross exterior wall area is 200 sf
3. 42 sf net glazing area with VLT of 0.88, in a space whose gross exterior wall area is 140 sf

AnswerEA = VT x WWR. EA = 0.264 - 0.266 - each of these windows offers the same effective aperture within the ideal value range.

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