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

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Energy-efficient glazing makes your home more comfortable and considerably lowers your energy expenses. Nevertheless, unsuitable or badly created glazing can be a significant source of unwanted heat gain in summer and considerable heat loss and condensation in winter. As much as 87% of a house's heating energy can be gained and as much as 40% lost through windows.

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Glazing is a significant financial investment in the quality of your house. A preliminary financial investment in energy-efficient windows, skylights and doors can significantly decrease your annual heating and cooling costs.

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This tool compares window selections to a base level aluminium window with 3mm clear glass. Understanding a few of the key properties of glass will assist you to pick the best glazing for your home. Key homes of glass Source: Adapted from the Australian Window Association The amount of light that passes through the glazing is understood as visible light transmittance (VLT) or noticeable transmittance (VT).

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The U value for windows (revealed as Uw), describes the conduction of the whole window (glass and frame together). The lower the U value, the higher a window's resistance to heat circulation 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 worth of 6. 2W/m2 C, on a winter's night when it is 15C colder outside compared with 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 large room gas heating unit or a 6.

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If you pick 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 halve 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 flows through a whole window (glass and frame together).

The lower a window's SHGC, the less solar heat it sends to the home interior. Glazing manufacturers declare an SHGC for each window type and style. However, the real SHGC for windows is impacted by the angle that solar radiation strikes the glass. This is called 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 makers is always computed as having a 0 angle of incidence. As the angle increases, more solar radiation is reflected, and less is transmitted.