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