glazing U >6.5

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Posts: 23

glazing U >6.5

Postby xyliu925 » Sat Apr 25, 2015 7:57 pm

Just from the simulation point of view. Can I create a glazing having U value >6.5?

Luis Sousa
Posts: 372
Location: Stroud

Postby Luis Sousa » Tue Apr 28, 2015 9:30 am


As noted in the program help ( ... nition.htm), using the Simple Glazing Definition Method the maximum U-value is 5.8 W/m2K because this is the most conductive glazing system possible given the standard conditions that can realistically be achieved.

In the following article you can find more information about the 5.8 W/m2K limitation: ... -of-7-wm2k

If you need to model a glazing system with a very high U-value (above 5.8 W/m2K) the published rating probably contains the frame, in which case you should add a frame separately to obtain the required overall glazing + frame U-value.
You can find some detailed information about the U-value to use and how the NFRC and EU format U-values differ on the DesignBuilder B.I.G. website: ... 5-13-45-51


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