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Low emissivity (low e or low thermal emissivity) refers to a surface condition that emits low levels of radiant thermal (heat) energy. All materials absorb, reflect, and emit radiant energy according to Planck's law but here, the primary concern is a special wavelength interval of radiant energy, namely thermal radiation of materials.
Low emissivity glass (low E glass) is a commercially available option for IGU construction. Low E glass is made by applying a Low E coating to a pane of glass. These are generally metallic coatings, usually applied onto the second or third glass surfaces of the unit, that have the effect of reflecting infrared light, and blocking or attenuating ...
Storm windows come with either glass or acrylic panes. Glass panes provide better visibility and last longer, whereas acrylic panes are less breakable but can scratch more easily. Modern storm windows often feature low-e glass, which improves energy efficiency by reflecting heat. "Storm Windows". U.S. Department of Energy
The low-emissivity (low-E) windows they developed have saved $7.7 billion on energy costs and 1.2 quadrillion BTUs, according to National Academy of Sciences' data. [2] Selkowitz had to convince window manufacturers of the benefits of low-E glass before its use became widespread. [3]
Quadruple glazing (quadruple-pane insulating glazing) is a type of insulated glazing comprising four glass panes, commonly equipped with low emissivity coating and insulating gases in the cavities between the glass panes. Quadruple glazing is a subset of multipane (multilayer) glazing systems.
Window glass can be coated to achieve low emissivity or "low-e". Some windows use laminate polyester film where at least one layer has been metalized using a process called sputtering . Sputtering occurs when a metal, most often aluminum, is vaporized and the polyester film is passed through it.
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