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Glazing simply indicates the windows in your house, including both openable and fixed windows, as well as doors with glass and skylights. Glazing in fact simply indicates the glass part, but it is normally used to refer to all elements of an assembly consisting of glass, films, frames and furnishings. Taking notice of all of these aspects will help you to achieve effective passive design.

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Energy-efficient glazing makes your home more comfy and dramatically lowers your energy expenses. Unsuitable or improperly created glazing can be a significant source of unwanted heat gain in summer and significant heat loss and condensation in winter. Up to 87% of a house's heating energy can be gotten and as much as 40% lost through windows.

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Glazing is a considerable financial investment in the quality of your house. An initial investment in energy-efficient windows, skylights and doors can significantly decrease your yearly 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 residential or commercial properties of glass will help you to select the best glazing for your house. Key homes of glass Source: Adapted from the Australian Window Association The amount of light that travels through the glazing is referred to as visible 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 expenses. Conduction is how easily a product performs heat. This is known as the U value. The U value for windows (revealed as Uw), explains the conduction of the entire 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.

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 cooler outside compared with inside, the heat loss through the windows would be: 6. 2 15 70 = 6510W That is comparable to the total heat output of a large space gas heating unit or a 6.

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If you select a window with half the U worth (3. 1W/m2 C) (for instance, double glazing with an argon-filled gap 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 easily heat from direct sunlight streams through an entire window (glass and frame together).

The lower a window's SHGC, the less solar heat it transfers to the house interior. The real 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 occurrence of 0 and the window will experience the maximum possible solar heat gain. The SHGC stated by glazing producers is constantly computed as having a 0 angle of incidence. As the angle increases, more solar radiation is reflected, and less is transferred.