I'm modeling a fit out space in which the data for the base building envelope (U values and SHGC) are not available, need to know if I can use the baseline envelope data in my proposed model?
if not what can I do to model my proposed case please?
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Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5907 thumbs up
April 30, 2020 - 1:45 pm
Typically we would attempt to ascertain and evaluate the existing condition to derive the Uvalue.
Omar Elrawy
Green Building Consultant | ResearcherGreenA Consultants
56 thumbs up
May 3, 2020 - 5:07 pm
We are still trying to retrieve the data, hwever, is there any alternative if we failed to retrieve the base building envelope data?
Also, would it be acceptable to use a calculation tool (for instance Window 6) to estimate U-value and SHGC?
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5907 thumbs up
May 4, 2020 - 10:00 am
The best alternative is to make as conservative (contributes to your savings less than you think it will) an assumption as you can. Assume a worst case scenerio. SHGC is probably the hardest despending on the glazing in place.
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5907 thumbs up
May 4, 2020 - 10:03 am
You can measure SHGC in the field - http://energy-models.com/forum/measurement-shgc-field
Yes you can use a calculation tool to estimate U- Values!
Waleed AlGhamdi
Sustainability EnablerEskew+Dumez+Ripple
20 thumbs up
May 6, 2020 - 12:16 pm
I believe you can use Table A8.2 from ASHRAE 90.1 2010, but this is not recommended as it will likely penalize the project becuase the U-values are very high.