[TRNSYS-users] U value problem

[Yuki SASAKI]

Dear all,

I try to change only the U value of the window by editing the BUI file, but
it is not possible to correct it.
I have changed U value without changing an optical characteristic of the
window.
When U value was output via SimulationStudio, it has no change, while the
output of TRNBuild gave the changed U value.

The corrected part is shown as follows.

Window U value of BUI file
****************Value Before**************************************
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  3.43  8.23  5.30 5.30  4.98 4.98  4.97 4.97  5.57 5.57
0        6.71  25.47  3.34  8.30  6.31 6.31  5.77 5.77  5.72 5.72  6.51 6.51
783        0.00  12.25  3.47  8.19  5.29 5.29  4.80 4.80  5.19 5.19  5.66
5.66
783        6.71  25.47  3.36  8.28  6.30 6.30  5.64 5.64  5.91 5.91  6.59
6.59

****************Changing Value*************************************
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  3.43  8.23  6.03 6.03  5.67 5.67  5.66 5.66  6.34 6.34
0        6.71  25.47  3.34  8.30  7.18 7.18  6.57 6.57  6.51 6.51  7.41 7.41
783        0.00  12.25  3.47  8.19  6.02 6.02  5.46 5.46  5.91 5.91  6.44
6.44
783        6.71  25.47  3.36  8.28  7.17 7.17  6.42 6.42  6.73 6.73  7.50
7.50


And, I have two question.
1. Is the method of changing U value suitable?
2. How should I do so that only U value may change without changing 
an optical characteristic in the window?

Thanks in advance

Yuki SASAKI


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