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Gilles,<br>
If I understand correctly, Type56 calculates the window U-value at
each time step and at each iteration in the simulation. The u-value at
any point in time is dependent upon a complex calculation of window pane
temperatures, gas cavity temperatures, zone temperature, and ambient
temperature. The u-value reported in the WindowLib is at some reference
condition and is for the center of glass. There is a Type56 output (NTYPE
50 among the "surface outputs") available to show what value
Type56 is calculating for the window u-value during the simulation.<br>
Cheers,<br>
David<br><br>
<br>
At 07:55 10/12/2006, Gilles Fraisse wrote:<br>
<blockquote type=cite class=cite cite="">dear trnsys users ,<br>
using TYPE 56, we have some problems with the U value of the window. For
exemple, I use this window from the german library (window type, library
...) :<br><br>
Unit System : SI, Name : TRNSYS 15 WINDOW LIB, Desc :
Waermeschutzglas,Ar, 1.3 71/59, Window ID : 2002, Tilt : 90.0<br>
Glazings : 2, Frame : 11 2.270, Spacer : 1 Class1 2.330 -0.010 0.138,
Total Height: 1219.2 mm, Total Width : 914.4 mm<br>
Glass Height: 1079.5 mm, Glass Width : 774.7 mm<br><br>
<br>
In the *.bui file , I consider an area of 4.15m² . But which value of U
(and of area) is really used in the simulation ? I have compared with the
steady state modelling (constant external temperature - solar radiation
=0, constant internal heat gain ... ) and I cannot find 1.3 W/m²K , nor
0.85*1.3 + 0.15*8.17/3.6 (If I consider the frame). And there's no
problem if I delete the window. <br><br>
Has anybody carried-out the same steady state checking with one
window ?<br><br>
best regards<br>
G. Fraisse<br><br>
<br><br>
<br><br>
<br><br>
<br>
<br>
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