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NC-2009 EAp2:Minimum Energy Performance

Framed assembly U-value calculated by WinISO 2D Software

Hi, As per reviewer comment the calculation for U-value of whole window assembly (including frame) used for the Proposed case windows can be demonstrated by different method such as NFRC rating, Window 5 software or simulation tool. The client sent me a complete assembly report developed in WinISO tool. The calculation has been done according to DIN EN ISO 10077-2. Question is: Is this methodology acceptable in LEED?

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Profile picture for user sheffer
Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Tue, 06/03/2014 - 14:05

I am not familiar with that standard but a quick online search indicates that it would be an appropriate tool/standard. While I can't say for certain I would think it would be acceptable.

Wed, 06/04/2014 - 08:13

Thank you Marcus for your view.
Profile picture for user Marais.Jean
Jean Marais
b.i.g. Bechtold DesignBuilder Expert
LEEDuser Basic Member
581 thumbs up

Wed, 06/04/2014 - 12:07

It seems as if the difference is minimal. I've posted a step by step to go from EU-rated values to American-rated values for fenestration here: http://www.designbuilder-big.com/index.php/2013-02-25-13-40-45/2013-02-25-13-45-50/2013-02-25-13-45-51 It's aimed at energyplus / designbuilder users, but will be helpful to all who want to test this. It's still in the review phase by the WINDOW developement team.

Mon, 11/30/2015 - 11:43

Hi all, Has anyone got an acceptance using the ISO 10077 standard for window assembly U-value calculation? Many thanks!

Mon, 11/30/2015 - 12:01

We were uploading U-value calculations according to ISO 10077 standard provided by the window producer and so far it was accepted for a few projects.

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