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

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Energy-efficient glazing makes your house more comfy and considerably decreases your energy expenses. However, unsuitable or improperly created glazing can be a major source of undesirable heat gain in summertime and substantial heat loss and condensation in winter. Up to 87% of a house's heating energy can be acquired and as much as 40% lost through windows.

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Glazing is a significant financial investment in the quality of your house. The cost of glazing and the cost of heating and cooling your house are closely related. A preliminary investment in energy-efficient windows, skylights and doors can significantly reduce your annual cooling and heating expense. Energy-efficient glazing likewise reduces the peak heating and cooling load, which can lower the needed size of an air-conditioning system by 30%, resulting in further expense savings.

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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 residential or commercial properties of glass will help you to choose the finest glazing for your home. Secret properties of glass Source: Adapted from the Australian Window Association The amount of light that travels through the glazing is known as noticeable light transmittance (VLT) or visible transmittance (VT).

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This may lead you to turn on lights, which will result in higher energy costs. Conduction is how easily a material conducts heat. This is known as the U worth. 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 flow and the better its insulating worth.

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 cooler outside compared with indoors, the heat loss through the windows would be: 6. 2 15 70 = 6510W That is equivalent to the total heat output of a big space gas heater or a 6.

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If you select a window with half the U value (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 (expressed as SHGCw) determines how easily heat from direct sunshine flows through a whole window (glass and frame together).

The lower a window's SHGC, the less solar heat it transfers to the home interior. Glazing makers state an SHGC for each window type and style. Nevertheless, the real SHGC for windows is impacted by the angle that solar radiation strikes the glass. This is known as the angle of occurrence.

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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 maximum possible solar heat gain. The SHGC stated by glazing makers is constantly computed as having a 0 angle of incidence. As the angle increases, more solar radiation is reflected, and less is transmitted.