GLASS

thermo-insulating

 

-   Thermal insulation

-   Sound insulation

-   Decreasing  transmission of sunlight  (insolation)

The degree of thermal insulation is expressed by U and measured in W/sq.m.K.

Thermo-insulating glass panels can be made of transparent float glass, laminated glass, low-emission glass , low-emission glass coated by a soft coat of reflecting or semi-reflecting glass.

Thermo-insulating glass panels can be filled with air or inert gasses (argon) which improve the thermo-insulating performances of the glass.

The distance between the glass panes is achieved by 6-24 mm wide aluminium strips  containing moisture absorber. The strips are fixed by butyl. Glass panes are joined together by pressing them over the butyl, while sealing is achieved by applying hot-melt compound or putty depending on type of glass. 

The heat transmission coefficient of  a float 4mm thks. glass pane  is 5.7 W/sq.m.K, while a triple glass panel of 4+8+12+4 mm thickness, made of low-emission glass with soft coat and filled with argon gas has a heat transmission coefficient of 1.0 W/sq.m.K. 

Low-emission insulating glasses, due to the surface coat,  have the ability to transmit the sunlight into the interior letting the heat in too, and not allowing the heat energy provided in this way to return back into the exterior. Heat loss from the interior into the atmosphere, for the low-emission glass filled with argon, is decreased up to 1.5 times compared to the traditional glazing. The heat saved corresponds to cooling resulting from 100 km/h wind. 

In addition to heat loss decreasing, low-emission glass panels decrease transmission of external heat from the exterior into the interior.