[BLDG-SIM] To change the U-value of the window using LBNL Window
Graham & Megan
hamnmegs at ozemail.com.au
Fri Nov 24 13:33:27 PST 2006
The reason why you see single glazed units with U-Values varying from 5.7 to
6.5 W/m2K is due to the varying environmental conditions (and thus film
resistance) the insulation value is nominated at. I believe your 6.51 is at
winter conitions and thus higher wind speed. Rather than changing the glass
you should change the environmnetal conditions, but i suspect TRNSYS then
calculates its own film coefficients and just looks at the glazed unit
----- Original Message -----
From: "Ken HATAKEYAMA" <ken at imagicdesign.co.jp>
To: <BLDG-SIM at gard.com>
Sent: Friday, November 24, 2006 1:50 PM
Subject: [BLDG-SIM] To change the U-value of the window using LBNL Window
> Dear all,
> I tried to make a new glazing system for TRNSYS16 with LBNL Window.
> To make a glazing system that has the U-value, 6.51W/m^2K.
> I created a new glass and duplicated the whole data of clear single glass
> in glass library(its ID is 102, generic clear glass). The U-value of the
> glass is 5.912W/m^2K.
> I changed U-value of the new glass by changing the conductivity from
> detailed view of glass library. But it only changed slightly(6.023W/m^2K
> Center of Glass, and 5.833W/m^2K in Total Window), even though I changed
> the value of conductivity (to 1000W/m^2K!).
> I set the U-value of the frame 6.51W/m^2K, and the width of the frame
> Optical characters do not need to change.
> What the value I have to change to make the glazing system I desired?
> Thanks in advance
> Ken Hatakeyama
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