u factors with NFRC certification or u factors according to european norms

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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

Y?k.M?h.Berke ?elikel

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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
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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

Fra: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] P? vegne af Yalin Uluaydin
Sendt: 21. oktober 2010 17:15
Til: Berke ?elikel; 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 Uluaydin

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