[TRNSYS-users] how to get the general U-value?

[Pietro Filippi]

sorry for another question,
I "decoded" the reported data from Window 5 as edited in W4-lib.dat file
in order to describe the global value as described at the "END OF THE
LIBRARY" in this file (see the example below). I found an exact
corresspondence for all the data except for the U-value, whose reported
value I suppose to be a mean value of the reported ones in the "Overall
and Center of Glass Ig U-values (W/m2-C)" lines. but which ones?
Otherwise I thought it should simply be the global value reported for
the glazing system of a given window, but I cannot verify it since a
can't resume the Trnsys W4-lib story of course...
can anybody confirm to me that it is correct to assume for U-value what
given for the glazing system and not get it from the Window 5 report? 
thanks in advance
Pietro
 
 
WINDOW 4.1  TRNSYS 14.2 Data File : Multi Band Calculation
 
Unit System : SI
Name        : TRNSYS 14.2 WINDOW LIB
Desc        : Dble,Low-e,Ar
Window ID   : 5001   
Tilt        : 90.0
Glazings    : 2
Frame       :  1 Al no break          10.790
Spacer      :  1 Class1                2.330  -0.010   0.138
Total Height: 1219.2 mm
Total Width :  914.4 mm
Glass Height: 1104.9 mm
Glass Width :  800.1 mm
Mullion     : None
Gap        Thick   Cond  dCond    Vis   dVis   Dens   dDens     Pr
dPr
1 Argon     12.7 0.01620  5.000  2.110  6.300  1.780 -0.0060  0.680
0.00066
2              0       0      0      0      0      0       0      0
0
3              0       0      0      0      0      0       0      0
0
4              0       0      0      0      0      0       0      0
0
5              0       0      0      0      0      0       0      0
0
Angle     0    10    20    30    40    50    60    70    80    90 Hemis
Tsol  0.544 0.548 0.539 0.529 0.514 0.486 0.426 0.312 0.145 0.000 0.453
Abs1  0.187 0.190 0.200 0.207 0.210 0.218 0.242 0.273 0.248 0.001 0.221
Abs2  0.048 0.049 0.049 0.050 0.051 0.052 0.050 0.045 0.033 0.000 0.048
Abs3      0     0     0     0     0     0     0     0     0     0     0
Abs4      0     0     0     0     0     0     0     0     0     0     0
Abs5      0     0     0     0     0     0     0     0     0     0     0
Abs6      0     0     0     0     0     0     0     0     0     0     0
Rfsol 0.220 0.214 0.212 0.214 0.224 0.244 0.282 0.371 0.574 0.999 0.268
Rbsol 0.236 0.231 0.230 0.232 0.241 0.261 0.307 0.414 0.629 1.000 0.291
Tvis  0.769 0.774 0.763 0.749 0.730 0.692 0.605 0.440 0.205 0.000 0.642
Rfvis 0.138 0.131 0.128 0.131 0.143 0.168 0.217 0.323 0.549 0.999 0.197
Rbvis 0.127 0.120 0.119 0.124 0.138 0.168 0.233 0.379 0.650 1.000 0.208
SHGC  0.596 0.600 0.592 0.583 0.569 0.543 0.483 0.366 0.188 0.000 0.507
SC: 0.69
 
 
 
Layer ID#          400        1        0        0        0        0 
Tir              0.000    0.000        0        0        0        0
Emis F           0.840    0.840        0        0        0        0
Emis B           0.100    0.840        0        0        0        0
Thickness(mm)      3.0      2.5        0        0        0        0
Cond(W/m2-C     )300.0    360.0        0        0        0        0    
Spectral File     None     None     None     None     None     None
 
Overall and Center of Glass Ig U-values (W/m2-C)
Outdoor Temperature                 -17.8 C      15.6 C      26.7 C
37.8 C
Solar      WdSpd  hcout hrout  hin
(W/m2)     (m/s)     (W/m2-C)
   0        0.00  12.25  3.24  7.59  1.44 1.44  1.35 1.35  1.38 1.38
1.45 1.45 
   0        6.71  25.47  3.21  7.62  1.51 1.51  1.39 1.39  1.43 1.43
1.51 1.51 
 783        0.00  12.25  3.41  6.82  1.41 1.41  1.42 1.42  1.47 1.47
1.53 1.53 
 783        6.71  25.47  3.31  7.10  1.51 1.51  1.45 1.45  1.51 1.51
1.56 1.56 
 
*** END OF LIBRARY ***
************************************************************************
********
*WinID  Description   Aufbau   U-Value  g-value  T-sol   Rf-sol   T-vis

************************************************************************
********
1001 Single_Pane            4                   5.8    0.870    0.850
0.075   0.901
2001 Double_Pane      2.5/12.7/2.5              2.7    0.777    0.727
0.129   0.817
3001 Triple_Pane      2.5/12.7/2.5/12.7/2.5     1.8    0.700    0.624
0.168   0.744
4001 Double,low-e     3.0/12.7/2.5              1.7    0.597    0.544
0.220   0.769
5001 Double,low-e,Ar  3.0/12.7/2.5              1.5    0.596    0.544
0.220   0.769
 
 
 
 
Ing. Pietro Filippi
Nier Ingegneria SpA
www.niering.it
Via Altabella 3, 40126 Bologna
tel: +39 051234359
fax: +39 051239530
 
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