[TRNSYS-users] Type 56 - strange window U-value

[Gilles Fraisse]

dear trnsys users ,
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 ...) :

Unit System : SI, Name : TRNSYS 15 WINDOW LIB, Desc : Waermeschutzglas,Ar, 
1.3 71/59, Window ID : 2002, Tilt : 90.0
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
Glass Height: 1079.5 mm, Glass Width : 774.7 mm


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.

Has anybody carried-out the same steady state checking  with one window ?

best regards
G. Fraisse










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