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Glazing simply implies the windows in your house, including both openable and set windows, in addition to doors with glass and skylights. Glazing really just indicates the glass part, but it is generally used to refer to all aspects of an assembly consisting of glass, films, frames and furnishings. Paying attention to all of these elements will assist you to accomplish efficient passive style.

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Energy-efficient glazing makes your house more comfy and significantly decreases your energy expenses. However, unsuitable or poorly designed glazing can be a significant source of undesirable heat gain in summer season and substantial heat loss and condensation in winter season. Approximately 87% of a house's heating energy can be gotten and up to 40% lost through windows.

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Glazing is a significant financial investment in the quality of your home. A preliminary financial investment in energy-efficient windows, skylights and doors can considerably minimize your yearly heating and cooling expense.

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This tool compares window choices to a base level aluminium window with 3mm clear glass. Comprehending a few of the crucial homes of glass will assist you to pick the finest glazing for your house. Secret properties of glass Source: Adapted from the Australian Window Association The amount of light that passes through the glazing is called visible light transmittance (VLT) or visible transmittance (VT).

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

For example, if your house has 70m2 of glazing with aluminium frames and clear glass with a U value of 6. 2W/m2 C, on a winter season's night when it is 15C chillier outside compared to 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 heating unit or a 6.

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

The lower a window's SHGC, the less solar heat it transmits to your home interior. Glazing manufacturers declare an SHGC for each window type and style. However, the real SHGC for windows is affected by the angle that solar radiation strikes the glass. This is referred to as the angle of occurrence.

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