[TRNSYS-users] Question about windows properties..

Hauer, Martin Martin.Hauer at uibk.ac.at
Tue Jun 24 23:54:23 PDT 2014

Dear Arnaud,

“F” means front, “B” means back, right!
In case of DOE, front side is facing exterior, back is facing to interior side (or in your case first column is the exterior glazing layer, second column is the interior glazing layer). It is also defined like this in the software WINDOW.
Therefore, also Rfsol is counting for the reflection part (only of glazing) of the glazing side facing exterior.

Concerning window geometries in the window manager: so far as I know this values should correspond to the values written in the doe-file. The  “real” geometry of the window has to be entered later as you mentioned by sketchup or manually in the Zone window. So TRNSYS uses the sketchup geometry for calculating the window gains/losses.

Kind regards,

Von: TRNSYS-users [mailto:trnsys-users-bounces at lists.onebuilding.org] Im Auftrag von Arnaud Candaele
Gesendet: Dienstag, 24. Juni 2014 16:35
An: trnsys-users at cae.wisc.edu
Betreff: [TRNSYS-users] Question about windows properties..

Hi all,
I know this kind of question has already been asked, but I can't seem to find a complete answer, so here it is again, maybe someone can help :
I'm using a window type in a building simulation, and for this I choose a window from the library "/American/w4-lib", ID 2306. Thiw window type has 2 layers of glass separated by a layer of gas.
My question is regarding the Emissivity properties that can be read :
Emis F   0.840 0.060
Emis B   0.840 0.840
I just want to be sure of what that means : I guess "F" and "B" are for "front" and "back", but which of these sides is actually towards the interior of the building ?
Also, which window is on the interior side, and which one on the exterior side (1st or second column ?) ?
I think that for exterior walls, TRNSYS uses "back" to describe the "outer" face of the wall (outside). But I also read somewhere (..) that for instance "Rfsol" (so "front" reflectance) in the window description is also for the exterior facing side of the window.. In the end, I don't know if "front" is supposed to mean "interior facing side" or "exterior facing side".

Also, in the window description, there are dimensions (width, height). In the Window Type Manager, there are also dimensions taht you can enter ("For 1 glazing module", just below "slope of window"). Finally, in the different zones of my building where I actually use this type of window, there is an area which correspond to the area of the window I drew in sketchup.
==> which one of these area is actually used in TRNSYS computation?
Any help would be greatly appreciated ! I've been looking in WINDOW manual, as wel in the TRNSYS manuals, I can't find anything in there...
Thanks ,

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