Vacuum Insulation Glass (VIG)
VIG is a double glazing with a vacuum between the panes of glass. This means that slim systems less than 10 mm thick can be realized with heat transfer coefficients of U ≈ 0.5 W/(m²K). Triple glazing, used, for instance, in passive houses, achieves a typical U-value of 0.6 - 0.7 W/(m²K) at a thickness of 28 - 44 mm, but is 50 % heavier. VIG with a U-value of ≈ 0,5 W/(m²K) is not yet available on the market. Production techniques for such systems are currently being developed within the framework of a BMWi-funded project. The results will be available in 2012. Click on the above links for more information.
