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Total U-value

asked 2017-11-30 12:34:34 +0000

anonymous user


updated 2017-11-30 12:36:07 +0000

I have an old window which is being partly replaced by new glass making it an 1+2-window. The outer "1-part" is made of old simple glass having a specified U-value of 5,8 W/m2K. The new inner "2-part" is a glass-argon-glass construction havning a specified U-value of 1,0 W/m2K. In between the two parts there is going to be a 41 mm air gap. Putting them together and calculating the totalt U-value I'm getting approx. 0,62 W/m2K. This seems a little low to me and will probably be difficult to achieve in reality. I guess the low value is a result of the air being to good of an insulation component when it is perfectly still and "trapped" in between the old and new glass parts (convection not accounted for?). How could I handle this instead?

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answered 2018-02-14 08:45:17 +0000

Per Sahlin gravatar image

ESBO does not currently handle ventilated air gaps in window constructions. You would have to use the full IDA ICE package with a double-sheet facade to model this correctly (assuming that you know the sizes of the leaks in the outer frame).

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Asked: 2017-11-30 12:34:34 +0000

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Last updated: Feb 14 '18