Hello all! I do believe my questions have yet to be touched upon but apologize if i just missed a comment in this section.
1. I am currently attempting to use option 2 Prescriptive method and am curious if anyone has been able to submit different "work heights" for their calculations? As our rooms are mostly used by toddlers, infants and teachers working and sitting on the floor, it seems 30" is too high of work height. Has anyone made a similar argument and it has been accepted by LEED?
2. This idea of the bay floor area slightly confuses me. Looking at the LEEDuser sample, it seems that through sort of arbitrary denotations of space, one can determine what windows light where and then these areas can be adjusted to have a compliant square footage and an uncompliant square footage. This is better than the all or nothing i was initially using to calculate each room but i'm still not sure this would apply to smaller classrooms that are only 600sq ft? I guess i dont see why not, just that it will be extremely time consuming to do this for each classroom.
3. In our design we use a lot of borrowed light through other spaces with interior windows. How would the VLT be calculated for that?
Thanks so much for any information,
The DW Arthur Team
Eddy Santosa
Director of SustainabilityDBR Engineering Consultants
376 thumbs up
May 17, 2012 - 4:38 pm
Hi Kelly,
Here is my opinion on your questions:
1. If you use prescriptive, there is no different in calculation for lower work plane. If you use simulation, it should be OK because that is actually the correct way.
2. In LEED calculation, the width is arbitrary. There is no requirement on that. The depth is actually the projection of your window head.
3. You can't use prescriptive for your case.
Jill Dalglish, PE
Lighting EngineerMKK Consulting Engineers
LEEDuser Expert
440 thumbs up
May 17, 2012 - 6:09 pm
Hi Kelly,
1.Where do you find work heights in the prescriptive option? They call out a height for the minimum window area as 30", is this what you mean. In that case, I can see an argument for lowering that to the seated height of your toddlers, but I don't know that it will make a huge difference in your calculations.
2. The "bay" stuff is confusing but the LEEDuser sample can be used in any type of space and space size.
3. You cannot use the prescriptive method for borrowed light. You do have the option of using the prescriptive method for the other areas and then using simulations for the borrowed light areas under Option 4. Combination.