Energy-efficient glass

Other definitions: heat saving glass, Low-E glass, selective glass - a polished float glass, on the surface of which is applied by spraying a special, coated with metal oxide semiconductor or non-ferrous metals. Glass coated with such a reflecting heat waves in the infrared range, which can significantly reduce heat loss from the room. Since the energy-saving glass selectively transmits the waves, it becomes clear one of its less common definition as selective glass.

Parameter characterizing the energy-saving properties of the glass is its emissivity (emission), which is defined as property of the surface reflect the long-wave thermal radiation. For comparison, emissitent surface (E) of an ordinary glass has a numerical value of E = 0.835, while Selective - less than 0.04, indicating that the issue of selective glass on the order of magnitude below the usual glass of emission, hence another name for energy-efficient windows - Low-E glass.

Energy-saving low-E glass coating has a thickness of several tens of nanometers, is no different from ordinary glass visually and absolutely transparent to the human eye. It is currently used two types of low-e coating glass: the so-called K-window - solid surface and I-Glass - soft cover. The first step in the production of energy-efficient glass was the production of C-glass. To make the float-glass, heat-saving properties directly in the manufacture, on its surface by chemical reaction at high temperature, creating a thin layer of metal oxide which is transparent and has electrical conductivity.

The next step in the manufacture of glass was heat-release of I-glasses, which by its heat-saving properties of 1.5 times the K-glass. The difference between the K-glass and i-glass is the coefficient of emissivity, as well as the technology of its receipt. I-glass is produced by vacuum deposition and is a multi-layer structure comprising a thin layer of silver on the surface.