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NC-2009 EAp2:Minimum Energy Performance

Review comments on widow U-value

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Chris Miller
Owner
Miller Consulting Group, LLC
LEEDuser Basic Member
1 thumbs up

We received the following review comments during our design review and my question is, where do I find the Uvalue for the frame & glass assembly mentioned in their comments(this is a storefront application with alum framing and the glass field applied)? Does this come from the manufacturer? What we provided was the Uvalue for the glass only. Review Comments: "It is unclear whether the window U-value of 0.28 used for the Proposed Case accounts for the impact of the window frames on the whole assembly as required by ASHRAE modeling protocol. Provide additional information to confirm that the framed assembly U-value was used for the Proposed Case windows (such as: showing that the whole window assembly has been tested by NFRC; verifying that LBNL Window5 calculations have been provided for the whole assembly; or verifying that the frame effects are captured within the energy modeling software)" Thanks in advance for any assistance Chris M

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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Fri, 12/13/2013 - 22:15

You need to show that the impact of the metal frames have been accounted for in the model. Sometimes you can get this from the manufacturer, sometimes you need to run Window 6 yourself, and sometimes you may be able to show that your modeling software is doing it. Basically you need to show the whole assembly performance of the windows. A typical metal framed storefront with low-e glass will have an assembly U-value in the 0.4 to 0.5 range..

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