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Glazing merely suggests the windows in your house, consisting of both openable and fixed windows, as well as doors with glass and skylights. Glazing really just implies the glass part, however it is typically used to describe all elements of an assembly including glass, films, frames and furnishings. Focusing on all of these aspects will assist you to attain effective passive design.

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Energy-efficient glazing makes your home more comfortable and significantly minimizes your energy costs. However, improper or improperly developed glazing can be a significant source of unwanted heat gain in summer season and significant heat loss and condensation in winter season. Approximately 87% of a house's heating energy can be gotten and approximately 40% lost through windows.

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Glazing is a substantial 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 financial investment in energy-efficient windows, skylights and doors can considerably decrease your annual heating and cooling costs. Energy-efficient glazing also minimizes the peak heating and cooling load, which can reduce the needed size of an air-conditioning system by 30%, resulting in additional expense savings.

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This tool compares window selections to a base level aluminium window with 3mm clear glass. Understanding some of the key homes of glass will assist you to choose the very best glazing for your house. Key homes of glass Source: Adjusted from the Australian Window Association The amount of light that passes 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 worth, the greater a window's resistance to heat flow and the much 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 chillier outside compared with inside your home, the heat loss through the windows would be: 6. 2 15 70 = 6510W That is comparable to the overall heat output of a big room gas heating system or a 6.

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If you pick 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 cut in half the heat loss: 3. 1 15 70 = 3255W The solar heat gain coefficient (SHGC) for windows (expressed as SHGCw) determines how readily heat from direct sunshine flows through an entire 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 maximum possible solar heat gain. The SHGC stated by glazing manufacturers is constantly computed as having a 0 angle of incidence. As the angle increases, more solar radiation is shown, and less is transmitted.