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Glazing simply means the windows in your home, consisting of both openable and set windows, in addition to doors with glass and skylights. Glazing in fact just means the glass part, but it is usually used to refer to all aspects of an assembly consisting of glass, films, frames and home furnishings. Taking notice of all of these aspects will help you to accomplish efficient passive style.

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Energy-efficient glazing makes your home more comfortable and drastically lowers your energy costs. Nevertheless, inappropriate or badly designed glazing can be a significant source of undesirable heat gain in summertime and considerable heat loss and condensation in winter. Up to 87% of a house's heating energy can be gotten and approximately 40% lost through windows.

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Glazing is a considerable financial investment in the quality of your house. An initial investment in energy-efficient windows, skylights and doors can considerably minimize your annual heating and cooling bill.

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This tool compares window choices to a base level aluminium window with 3mm clear glass. Understanding some of the essential properties of glass will assist you to choose the very best glazing for your house. Secret residential or commercial properties of glass Source: Adjusted from the Australian Window Association The amount of light that travels through the glazing is referred to as visible light transmittance (VLT) or visible transmittance (VT).

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The U value for windows (revealed as Uw), explains the conduction of the whole window (glass and frame together). The lower the U value, the higher a window's resistance to heat circulation and the better its insulating value.

If your house has 70m2 of glazing with aluminium frames and clear glass with a U worth of 6. 2W/m2 C, on a winter season's night when it is 15C chillier outside compared with inside your home, the heat loss through the windows would be: 6. 2 15 70 = 6510W That is equivalent to the overall heat output of a big room gas heater or a 6.

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If you select a window with half the U worth (3. 1W/m2 C) (for instance, double glazing with an argon-filled space and less-conductive frames), you can cut in half the heat loss: 3. 1 15 70 = 3255W The solar heat gain coefficient (SHGC) for windows (revealed as SHGCw) measures how easily heat from direct sunlight streams through an entire window (glass and frame together).

The lower a window's SHGC, the less solar heat it transfers to the house interior. Glazing makers state an SHGC for each window type and design. However, the real SHGC for windows is affected by the angle that solar radiation strikes the glass. This is understood as the angle of incidence.

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When the sun is perpendicular (at 90) to the glass, it has an angle of incidence of 0 and the window will experience the optimum possible solar heat gain. The SHGC declared by glazing manufacturers is constantly calculated as having a 0 angle of incidence. As the angle increases, more solar radiation is reflected, and less is sent.