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Glazing merely suggests the windows in your house, consisting of both openable and fixed windows, along with doors with glass and skylights. Glazing in fact simply implies the glass part, but it is usually utilized to refer to all aspects of an assembly including glass, films, frames and home furnishings. Taking note of all of these aspects will help you to attain efficient passive style.

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Energy-efficient glazing makes your home more comfy and significantly reduces your energy expenses. 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 acquired and approximately 40% lost through windows.

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Glazing is a considerable investment in the quality of your house. The expense of glazing and the expense of heating and cooling your home are carefully related. An initial financial investment in energy-efficient windows, skylights and doors can significantly lower your yearly heating & cooling expense. Energy-efficient glazing likewise lowers 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 selections to a base level aluminium window with 3mm clear glass. Comprehending some of the crucial properties of glass will assist you to choose the best glazing for your house. Key homes of glass Source: Adapted from the Australian Window Association The amount of light that goes through the glazing is understood as visible light transmittance (VLT) or visible transmittance (VT).

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

For instance, if your home 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 cooler outside compared with indoors, the heat loss through the windows would be: 6. 2 15 70 = 6510W That is equivalent to the overall heat output of a large space gas heater or a 6.

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If you choose a window with half the U value (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 (expressed as SHGCw) measures how readily heat from direct sunlight streams through a whole window (glass and frame together).

The lower a window's SHGC, the less solar heat it transfers to the home interior. The actual SHGC for windows is affected by the angle that solar radiation strikes the glass.

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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 stated by glazing manufacturers is constantly determined as having a 0 angle of incidence. As the angle increases, more solar radiation is reflected, and less is transferred.