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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 ...
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.
Single glass windows are no longer in general use. [4] The insulation provided by double or triple glazing can be further improved by selecting windows with low-e coatings, thermal breaks and argon or other similar gas between the panes, and also by selecting windows with high energy-efficient frames.
"Low-E windows" with transparent low-emissivity coatings emit less thermal radiation than ordinary windows. [5] In winter, these coatings can halve the rate at which a window loses heat compared to an uncoated glass window.
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]
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