Insulating glass also called thermal insulated glazing, is a window element made up of at least two panes of glass. The glass panes are bonded flush with each other with a defined spacing in between. The spaces between the panes are generally filled with a thermal insulating inert gas.
Glass conducts heat energy by radiation to the outside. Many metals have a significantly lower radiation. A thin coating of metal or metal oxide on glass reduces the emissivity of glass. For insulating glass, generally a single-sided coating is used on the interior side in the space between the glazing panels. This improves the thermal insulation properties.
Heat transfer coefficient (U value)
The U value is a measure of the "heat transmission" or the thermal insulation properties of components, such as the glazing of a window. A component with a small U value allows less heat through than a building component with a larger U value.
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