[Equest-users] u factors with NFRC certification or u factors according to european norms

[TOPP - Per Topp]

Hi Yalin

I am currently working in Equest to LEED-certify a project in Denmark.

What you are telling below is that I am not allowed to use the U-value that I get from the manufacturer (European) of the windows ?

And if that is true, does anyone then know a method to convert European U-values to the American standards?

I guess there must be a approximate relationship? And that it would be fair to use that method?

Best regards,

Per Topp
Senior Projektingeniør
Installation, El & VVS (Ballerup)

Tel. dir. +45 44 85 87 09
Mobile: +45 61 55 60 15
TOPP at orbicon.dk

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Lautrupvang 4B, DK-2750 Ballerup
Tel. +45 44 85 86 87 Fax +45 44 85 86 78

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Fra: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] På vegne af Yalin Uluaydin
Sendt: 21. oktober 2010 17:15
Til: Berke Çelikel; equest-users at lists.onebuilding.org; bldg-sim at lists.onebuilding.org
Emne: Re: [Equest-users] u factors with NFRC certification or u factors according to european norms

Berke,

U-values calculated according to ISO/EN 10077 and EN673 (for center of glass) use European boundary conditions which are 0 degrees C exterior and 20 degrees C interior. NFRC requires -18C and 21C therefore u-value results will be different.

Yalin


Yalin Uluaydin
Front

________________________________
From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Berke Çelikel
Sent: Thursday, October 21, 2010 5:52 AM
To: equest-users at lists.onebuilding.org; bldg-sim at lists.onebuilding.org
Subject: [Equest-users] u factors with NFRC certification or u factors according to european norms

Just a small question. I have glazing with its frame which you can see as an attachment. You can see the overall u factor ( glazing+frame) at the pdf file. But as you can understand it has certified and calculated according to the European norms. (The thermal transmission coefficients were figured for insertion elements and windows (Uw) according to EN 10077-1:2006 and for curtain wall (Ucw) in compliance with EN 13947:2006.) I mean our fenestration with u factors, SHGC or visible light transmittance did not determine, certify  and label in accordance with NFRC 100, 200, and 300. But we have European norm certifications. In that case I will not allowed to use the u factor value in the pdf ( which is 1,81 W/m2.K) for the NFRC u factor value of the  building simulation software (e quest). ?? Is that correct?

In this condition, do I have to use the figures mentioned in table A8.1A/B, table A8.2 for the proposed design ?? It means my windows are not certified or labeled and I will use worse u factors for the simulation but they are produced according to the European norms and we can see these information from the manufacturer specification. I have checked CIR section of the LEED online and I have seen a similar problem happened for the Japan norms.(fenestration has certified according to the Japan standards and LEED accepted that case)
Comments ????




Regards



Yük.Müh.Berke Çelikel
Lis.Mak.Müh/Yük.Lis.End.Müh.(Müh.Yön.)
BSc.Mech. Eng./MSc.Ind.Eng.(Eng. Man.)

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