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

Isabelle BRUYERE bruyere at arch.ucl.ac.be
Thu Feb 17 00:41:45 PST 2005


Hi Pietro,

Sorry I can't help you with that one. But I also noticed some difference 
between the U value given by WINDOW5 and the one showed by TrnBuilt, 
especially when you use Krypton between the glasses.
Does anybody have an explanation for that ?

Best regards,

Isabelle


A 17:55 16/02/2005 +0100, Pietro Filippi a écrit :
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>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
>
>_______________________________________________
>TRNSYS-users mailing list
>TRNSYS-users at engr.wisc.edu
>https://www.cae.wisc.edu/mailman/listinfo/trnsys-users

Isabelle Bruyère
Université Catholique de Louvain                        Place du Levant, 1 
à 1348 Louvain-la-Neuve
Unité d'architecture - Architecture et Climat           Tél : 010/47 21 38 
- Fax : 010/47 21 50
http://www-climat.arch.ucl.ac.be/
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