[TRNSYS-users] Persistent questioning about window definition

Thu May 23 00:49:20 PDT 2013

Hi,

Then I used a glass that I had created from WINDOW6 software, it turned out that the Uwin value, given output by TRNBUILD and used in the simulations, did not correspond to what I expected, result due to the Ug value from database and percentage frame  and Uframe filled in TRNBUILD.
After many tests, it appears that the calculated Uwin TRNBUILD differs if I take a glazing created in WINDOW6, for which I have not information of spacer and, or a glazing initially given in the TRNBUILD database.
While Uframe percentage and spacer values indicated in my database windows are the same.

Does anyone know where does this difference come from?
What values of Uframe, and percentage frame and spacer, does TRNBUILD consider : those entries in the database glazings or those filled in the database window that is created for each project?

This misunderstanding about the values considered by TRNBUILD is not at all reassuring.
Especially when I tested a window created with WINDOW6 and one from  the initial TRNBUILD database with 100% glass (so without frame).
And in the first case I found a Uwin value equal to 0.3 instead of Ug equal to 1.07.
And in the second case I found a Uwin value of 1.22 for the same value of Ug equal to 1.07.

Thanks a lot in advance for all your answers.

Best regards,

Pauline GELIN
Ingénieur Conception environnementale

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De : Marion Hiller [mailto:hiller at transsolar.com]
Envoyé : vendredi 18 mai 2012 08:49
À : Pauline GELIN
Cc : trnsys-users
Objet : AW: Re: [TRNSYS-users] problem of windows and layers definitions

Dear Pauline,

I had a quick look at your questions.

Concerning the definition of a window, we would like to know if Ug presented in the library already includes convective heat transfer coefficients (if so what value?) and the standard to which it is calculated ?

è  The Ug values presented in the German library related to products are the values you can find in the catalog.
This means including including convective + radiative heat transfer coefficients and are in general measuered under test condition
acc. to a standard. The values are shown such that the user can select a glass according to published properties.
These values are NOT used during the simulation! Type 56 uses the pane, gap properties as well as the pacer and frame properties
AND the real temperature conditions to calculate heat transfer through the window.

Best,

Marion

Dipl.-Ing. Marion Hiller

TRANSSOLAR: KlimaEngineering - Technologien für energieeffizientes Bauen und Nutzerkomfort in Gebäude

Munich - New York - Stuttgart + 49.711.67976.0

Transsolar Energietechnik GmbH, Curiestrasse 2, 70563 Stuttgart

Amtsgericht Stuttgart - HRB 23347, Steuernummer 99073/00911, USt-IdNr.: DE152272639

Geschäftsführer: Dipl.Ing. Matthias Schuler, Dipl.Ing. Thomas Auer, Dipl.Phys. Stefan Holst, Prof. Dipl.-Ing. Bleicher

-----Ursprüngliche Nachricht-----
Von: Pauline GELIN [mailto:p.gelin at katene.fr]
Gesendet: Mittwoch, 16. Mai 2012 16:38
An: David BRADLEY; Matt Duffy <duffy at tess-inc.com<mailto:duffy at tess-inc.com>> (duffy at tess-inc.com<mailto:duffy at tess-inc.com>); trnsys-users (trnsys-users at cae.wisc.edu<mailto:trnsys-users at cae.wisc.edu>)
Cc: Vincent MORELLE; Amélie MARILLER
Betreff: Re: [TRNSYS-users] problem of windows and layers definitions

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