I am currently using the prescriptive method supporting LEED calculator. Each classrooms have two types of VLT. One side window with 53% VLT that is located at one side of the room and another with 75% VLT located at the other side of the room. Right know since I just put only the windows with 53%, the classrooms doesn't not comply with the 75% daylit. I'm pretty sure if I add the windows that have the 75% VLT the classroom will comply with the requirement. My problem is that I don't know how to put the information in the spreedsheat. I though about taking an average between the VLT and sum all window areas but don't know if that approch will be accepted. My other alternative was to put first the room area, the window area with the correspondent VLT and add another row with the same room but changing the window area and VLT (the issue is that I will be duplicating room area) any thoughts, anyone?
Will appreciate any comment
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Lauren Fakhoury
Research Assistant85 thumbs up
May 2, 2012 - 9:42 am
I haven't run into this problem yet (it was easier to document the different VLTs in v2.2!) but maybe you can put them on separate lines. Instead of putting the same room area on each line, you can divide it based on what percentage of the room will receive daylight from one kind of window, and what percentage will receive daylight from the other kind. You can't know this for sure so it would have to be a good estimate. I wonder if that would work? Otherwise you might just have to do a daylight simulation.
TODD REED
Energy Program SpecialistPA DMVA
LEEDuser Expert
888 thumbs up
May 2, 2012 - 9:56 am
The divide the room in half if you can. If the depth of the daylight zone from both sides is halfway, or even if they overlap, use the midpoint. Separate the classroom on two different lines but only for half the square footage. Label it accordingly and definitely provide a narrative on what you are doing. If the two zones do not touch at midpoint, i believe you can increase the depth of the zone, not decrease, increase the one until the two zones cover the total area.
Eddy Santosa
Director of SustainabilityDBR Engineering Consultants
376 thumbs up
May 2, 2012 - 12:26 pm
The depth of the zone is driven by the height of the windows. Except they overlap, we cannot adjust the depth.
If they do not overlap, it will be easier. You can split into two floor area in any middle point in the area outside the zone floor areas. Each floor area has its own zone floor area. Because the zone floor area (a.k.a. daylight zone area) is always smaller or equal than the floor area, there will be no issue to split the rooms into two inputs.
I agreed with Todd for the midpoint if the daylight zones or zone floor areas overlap.