We have a project where we are using Soladigm Dynamic Glass which automatically tints the window based on how sunny it is using photosensors on each face of the building. I was wondering if anyone had experience modeling this for LEED? Our question is, do you have to use the worst case scenario for TVIS and heat gain when you model the window or can you take some sort of average? For example: on an overcast day the TVIS is 58 with a SHGC of 0.46 while on a sunny day it has a TVIS of 3 and a SHGC of 0.09.
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Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
November 26, 2012 - 5:17 pm
How it gets modeled depends on the software you use.
Ideally you would be able to schedule the glazing performance based on solar radiation exposure. Modeling the worst case (i.e. the most conservative savings) would at least need to vary seasonally in many climates. Some sort of average would need to be based on a very thorough study.
If the software you are using does not model this technology explicitly make sure you use the exceptional calculation measure to describe the work around. Hopefully you can find one that has been published.
I would check with the glazing manufacturer about how to model it. LBNL has done considerable research on the subject.