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Low-emissivity building materials include window glass manufactured with metal-oxide coatings as well as house wrap materials, reflective thermal insulations, and other forms of radiant thermal barriers. The thermal emissivity of various surfaces is listed in the following table. [1]
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 ...
These low "E" coatings were originally developed in 1978 at the Solar Energy Corporation (SOLEC) in Princeton, New Jersey for use in tubular evacuated solar collectors. The developer, Robert Aresty, designed them to be used as low emissivity surfaces on glass to replace vacuum deposited surfaces.
However, the additional manufacturing step adds to the cost of production, and the coating will degrade when exposed to the elements, and so can only be placed on the inside faces of a double-paned window. Generally, solar control Low-E windows are soft coat and passive Low-E windows are hard coat due to the lower emissivity of the soft coat.
In winter, these coatings can halve the rate at which a window loses heat compared to an uncoated glass window. [6] Solar water heating system based on evacuated glass tube collectors. Sunlight is absorbed inside each tube by a selective surface. The surface absorbs sunlight nearly completely, but has a low thermal emissivity so that it loses ...
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.
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