Re: [TRNSYS-users] TRNSYS Window Library

["Matt Duffy" <duffy@tess-inc.com>]

Hello Daniel,

If you consider TRNSYS and some other building models (energyplus, doe2),
they require much more window detail than the few listed values, such as
angle dependent values, glazing, gas gaps, and even SHGC is angular
dependent. As you probably know, the model uses thedata from the LBL
Window Program (DOE2 output report; more information about the format is
in the TRNSYS Volume 5 Manual - Section 5.2.11.3.5.). The Type56 window
model actually calculates the temperature between each pane based on the
information in that window report. More information is in the below
section.

Section 5.4.2
"For each glazing of the window, the resulting temperature is calculated
considering transmission, absorption and reflection of incoming direct and
diffuse solar radiation, diffuse short-wave radiation being reflected from
the walls of the airnode or an internal shading device, convective,
conductive and long-wave radiative heat transfer between the individual
panes and with the inner and outer environment (see Figure 5.4.2-1)."

To get back to your original question, you can try a few different
options. First of all, you should also determine if that is the overall
window U-value of the center of glass u-value, and try to obtain as much
or any information about the window construction as possible (frame
material, number of panes, thickness, gas, etc.)

Go through the Window Tutorial for TRNSYS at the following link to
implement a window. The more information you have from the manufacturer
the better. As you construct the window in Window, you can do a
calculation of the u-value.
http://sel.me.wisc.edu/trnsys/downloads/tutorials_and_examples/window5/windowtutorial.pdf

The NFRC may very well have specific windows that match your requirements
and list according to u-values. If you obtain the manufacturer information
you can then apply that information to the Window Program.

Last and probably least reliable, the you can search through the different
libraries TRNBuild Window Typemanger. There are a handful of different
window constructions in the respective libraries.
.\Building\Lib\Tess\W4-lib.dat
.\Building\Lib\American\W4-lib.dat
.\Building\Lib\Basic\W4-lib.dat

Daniel, feel free to contact me if you need more information or insight.




Best regards,

Matt Duffy
Project Engineer, TRNSYS Coordinator
Thermal Energy System Specialists
22 N Carroll, Suite 370
Madison, WI  53703
608.274.2577
duffy@tess-inc.com

----- Original Message -----
From: "Daniel Bergey" <daniel@buildingscience.com>
Sent: Thu, August 19, 2010 10:29
Subject:[TRNSYS-users] TRNSYS Window Library

I'm putting together a TRNSYS model for research on ventilation and
dehumidification. We have identified the windows we will use in terms of
SHGC and U-value, which of course isn't enough as inputs to Type56.  The
library bundled with TRNSYS does not have windows reflecting what we see
in residential buildings.

I expect others have run into the same problem.  Does anyone have window
inputs that fit any of the following examples?

U-value (IP)   SHGC
0.4               0.4, 0.35, 0.3
0.35              0.4, 0.35, 0.3
0.3               0.4, 0.35, 0.3, 0.25
0.25              0.35, 0.3, 0.25

Thank you,
Daniel
-- 
Daniel Bergey
Building Science Corporation
30 Forest Street
Somerville, MA  02143
978-589-5100 x 5277
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----- End of original message -----