The U-value quoted is for a single pane of 4mm glass as secondary glazing. To work out the U-value of a sealed, double-glazed unit as secondary double glazing would needs some software and I would suggest you download Build Desk. It is free and fairly simple to use - although I must confess I have never tried the calculation you ask about.
As a guess. The sealed unit your are considering will probably have a U-value in the order of 1.8 to 2.2. Using it as secondary glazing will a significant impact. If the original window is a draughty U-value of 5, this could easily get it around 1.0Does your figure of 2.8 - 3.0 w/m2 relate to the adding of one pane or a sealed unit? How does one work out the U-value of adding a sealed unit as secondary galzing, say with a 100mm drafty gap then a 16mm sealed gap? for the more visit this links
http://www.trittonglass.co.uk./index.php/
As a guess. The sealed unit your are considering will probably have a U-value in the order of 1.8 to 2.2. Using it as secondary glazing will a significant impact. If the original window is a draughty U-value of 5, this could easily get it around 1.0Does your figure of 2.8 - 3.0 w/m2 relate to the adding of one pane or a sealed unit? How does one work out the U-value of adding a sealed unit as secondary galzing, say with a 100mm drafty gap then a 16mm sealed gap? for the more visit this links
http://www.trittonglass.co.uk./index.php/
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