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Glazing just indicates the windows in your house, consisting of both openable and fixed windows, in addition to doors with glass and skylights. Glazing in fact simply implies the glass part, however it is usually utilized to describe all aspects of an assembly including glass, films, frames and furnishings. Focusing on all of these elements will help you to attain effective passive design.

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Energy-efficient glazing makes your home more comfy and significantly reduces your energy costs. However, inappropriate or poorly designed glazing can be a major source of unwanted heat gain in summer season and considerable heat loss and condensation in winter season. Approximately 87% of a home's heating energy can be gained and up to 40% lost through windows.

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Glazing is a significant financial investment in the quality of your house. The expense of glazing and the cost of heating and cooling your house are closely associated. A preliminary investment in energy-efficient windows, skylights and doors can greatly reduce your annual heating & cooling expense. Energy-efficient glazing also minimizes the peak heating and cooling load, which can reduce the needed size of an air-conditioning system by 30%, leading to more cost savings.

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This tool compares window choices to a base level aluminium window with 3mm clear glass. Understanding some of the crucial residential or commercial properties of glass will assist you to choose the best glazing for your home. Secret homes of glass Source: Adapted from the Australian Window Association The quantity of light that passes through the glazing is understood 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 worth, the greater a window's resistance to heat circulation and the better its insulating value.

For instance, 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's night when it is 15C colder outside compared to inside, the heat loss through the windows would be: 6. 2 15 70 = 6510W That is equivalent to the overall heat output of a big space gas heating system or a 6.

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

The lower a window's SHGC, the less solar heat it sends to your house interior. Glazing producers declare an SHGC for each window type and style. Nevertheless, the actual SHGC for windows is impacted by the angle that solar radiation strikes the glass. This is known 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 producers is constantly determined as having a 0 angle of incidence. As the angle increases, more solar radiation is shown, and less is transferred.