heat loss in buildings means a rise in energy costs. A lot of wasted energy occurs in the form of heat escaping through the windowpanes. Therefore, the selection of a thermally efficient window is essential to reduce heat loss.
A principal function of the window is to allow the passage of light (and eventually the fresh air) and allow a view outside for the occupants. However, the windows will also perform several other functions such as thermal comfort, noise protection, security, etc. The thermal comfort of a window (heat loss) is expressed by its value U. A low U value means a lower loss of heat from inside to outside the building while a high U value means the opposite. Pata increase the thermal performance of a window the following improvements can be applied:
Multi (Double) laminated glass
Two glass panels are better than one. The purpose of multiple (double) glass panels in a window is to create an air space between the glass to act as an insulator. Double glazed windows are better than simple glass windows because they reduce air convection heat (air movement is caused by the difference in temperature between the glass surface and room air).
air gap width Senior
air spaces insulate better than narrow, but an increase too in the air gap width produces a convective flow between the glass and does not provide a gain of insulation.
Filled with low-conductivity gas
Filling the gap formed between the glass having a low conductivity gas such as argon or krypton at atmospheric pressure improves thermal performance and reduces heat loss.
low emissivity glass (Low-E)
Introduced during the energy crisis of the 70's, low emissivity coating applied over a glass of double glazed unit hermetic, allowing the short-wavelength light of the sun entering the room and at the same time prevent the heat from the exhaust air from the room. This means a warm home more energy gain.
warm edge spacers, low conductivity
To prevent heat loss caused by the spacers on DVH units, more and more consumers use low-conductivity materials to separate glass panels using the so-called warm edge spacers .
window frame
The window frames are available in different styles and can be made of different materials. Each material (wood, PVC) offers several thermal performance.
Source: http://www.glassonweb.com/articles/article/238/?myKeyword=warm edge
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