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 Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Thu, 04/30/2020 - 17:45

Typically we would attempt to ascertain and evaluate the existing condition to derive the Uvalue.

Omar Elrawy

Green Building Consultant | Researcher

GreenA Consultants

LEEDuser Basic Member

38 thumbs up

Sun, 05/03/2020 - 21:07

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 Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Mon, 05/04/2020 - 14:00

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 Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Mon, 05/04/2020 - 14:03

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 Enabler

Eskew+Dumez+Ripple

LEEDuser Basic Member

20 thumbs up

Wed, 05/06/2020 - 16:16

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.

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