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Energy saving IGU

In energy-saving Insulated Glass Units is mounted at least one pane of low-E glass. In the standard double-glazed IG unit one sheet of glass replacing by selective glass, heat transmission of the IG unit is reduced almost by half, with Uf=2,7 W/m²K (4-16-4) to Uf=1,4 W/m²K (4-16-4KS). The coefficient of thermal conductivity is improved even more replacing an air in the chamber with an inert gas - Uf=1,1 W/m²K (4-16Ar-4KS). A little bit of improvement the value of the thermal conductivity can be achieved replacing an argon with krypton and increasing distance between panes up to 20 mm (if chamber is filled with air, the optimum width of the spacer is 16 mm, while when the chamber is filled with inert gas the optimal distance between glass panes is 16-20 mm, depending on the used gas or gas mixture, because of its convection features), the thermal conductivity of a single-chamber IG unit can be reduced only to Uf≥1,0 W/m²K. In the single-chamber double-glazed window even the second glass replacing with selective one fails in achievement a significant improvement in thermal resistance.

A significant improvement in thermal performance is achieved a single-chamber glazing (Uf=1,4 W/m²K (4-16-4KS)) replacing with double-chamber one (Uf=1,1 W/m²K (4-16-4-16-4KS)). Insulating properties are even better when air is replaced with argon, and particularly good results of double-chamber IGU are get when both two outer panes are selective glass - Uf=0,6 W/m²K (4KS-16Ar-4-16Ar-4KS).

The main drawback of energy-efficient triple-glazed windows, along with their relatively high price is their almost half as much weight as compared with single-chamber glazing. Modern technologies of plastic and wooden windows are designed for application even heavier glass units, but when installing triple-pane windows one has to keep in mind a more rapid deterioration of fasteners and the need for the regulation of window fittings.