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Forum discussion

NC-2009 EAp2:Minimum Energy Performance

U Value & SHGC

Hi, We are in the process of doing Energy Simulation for Garments Factory. We have completed the base case part and proposed case is pending. So that we have received the all necessary details such as LPD, EPD, Specification of Envelopes, etc... From the specification of envelopes, we have observed that they have not mentioned the U Value, SHGC. They have mentioned the following specifications only. 1. Width 2. Density 3. Sp. Heat 4. Conduct. 5. Hatch - Defines the displayed hatch pattern of the layer. We need the specified values for U value and SHGC. Is it possible to calculate U value and SHGC from the above specifications? (Point No 1 to 5) If possible, I would like to know the method to calculate the same. I need your help please.. Note: Multi layers are used in the building envelopes.

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Profile picture for user Marais.Jean
Jean Marais
b.i.g. Bechtold DesignBuilder Expert
LEEDuser Basic Member
581 thumbs up

Fri, 02/21/2014 - 08:38

ASHRAE Standard 90.1-2007 App. A is your new best friend. Get to know her very well. It also tells you what to do if your envelope componant does not fit any of the available constructions and which are the best guidelines to use if user calculating values (which is a pretty intensive excersize, so try to avoid that if possible). Good reading!
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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Fri, 02/21/2014 - 14:33

You can typically get the SHGC from the glazing or window manufacturer. One part of your post struck me. You did the baseline before the proposed? In general this is backward as many items in the baseline are dependent on the proposed. Perhaps you should try it the other way around next time.

Wed, 02/26/2014 - 12:18

I remember ASHRAE 90.1-2007 Users' Manual provides guides on how to calculate U-values (U-factors). SHGC might not be easy to calculate unless you have very detailed property data of glazing(s).
Profile picture for user sheffer
Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Wed, 02/26/2014 - 18:46

You are allowed to use the default values from Table A8.2. In a factory with high process loads the windows may not have much of an effect on energy use and perhaps using these defaults will not adversely affect the results too much.

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