Insulated glazing
Insulated glazing, otherwise known as double glazing or triple glazing, refers to the layers of glass in a window. A double glazed window is two panes of glass (also called a lite) with a sealed air (or gas) space in the middle.[1] The edges are sealed together with an air-tight spacer. This is used so that heat cannot escape through the air space by conduction or convection. Heat radiation is not affected as it can travel through a vacuum space. To increase the R-value of insulated windows are sealed with argon gas.[2]
Insulated Glazing Media
A sectioned diagram of a fixed insulating glass unit (IGU), indicating the numbering convention used in this article. Surface #1 is facing outside, surface #2 is the inside surface of the exterior pane, surface #3 is the outside surface of the interior pane, and surface #4 is the inside surface of interior pane.
EURO 68 wooden window profile with insulated glazing
A typical installation of insulated glass windows with uPVC frames
Insulated glazing unit composition
Hybrid spacers - examples (left to right): TGI, Swisspacer V, Thermix TX.N and Cromatech Ultra
Examples of modern plastic and wooden window profiles with insulated glazing
VIG equipped window TIR imaging
Quadruple glazed office building in Oslo, Norway, U-value 0.29 W/m2K, R-value 20
Peak summer pane temperatures of the triple-pane argon filled and low-E coated IGU
Temperature-dependence of the PIB primary sealant water vapor permeation
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