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The glass panels in double-glazed windows transmit heat in both directions by radiation, through the glazing by conduction and across the gap between the panes by convection, by conduction through the frame, and by infiltration around the perimeter seals and the frame's seal to the building.
Clear double glazing has a U-factor between 1.8 and 3 W/(m 2 ⋅K) or between 0.3 and 0.5 Btu/(h⋅ft 2 ⋅°F) (about R-2) Clear triple glazing has a U-factor between 0.5 and 1 W/(m 2 ⋅K) or between 0.1 and 0.2 Btu/(h⋅ft 2 ⋅°F) (about R-3). Double and triple glazing are critical for energy efficiency. Single glass windows are no longer ...
Common types of glazing that are used in architectural applications include clear and tinted float glass, tempered glass, and laminated glass as well as a variety of coated glasses, all of which can be glazed singly or as double, or even triple, glazing units. Ordinary clear glass has a slight green tinge, [4] but special colorless glasses are ...
A window is an opening in a wall, door, roof, or vehicle that allows the exchange of light and may also allow the passage of sound and sometimes air.Modern windows are usually glazed or covered in some other transparent or translucent material, a sash set in a frame [1] in the opening; the sash and frame are also referred to as a window. [2]
Such projects involve re-roofing work which can increase energy efficiencies, [6] re-cladding or painting the external skin of the building to give a modern look, [7] replacement of sky lights and atriums with double glazing solar reduction glass and internal refits where additional insulation is added when internal rooms are renovated.
Modern double-glazed sash windows are available. These may have true muntins or "glazing bars", or may imitate them by applying them to the surface of the glazing, giving the appearance of multiple small panes, whereas each sash consists of only one large double-glazed unit. [citation needed]
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