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Glazing simply means the windows in your house, including both openable and fixed windows, as well as doors with glass and skylights. Glazing really simply suggests the glass part, but it is usually used to describe all aspects of an assembly including glass, movies, frames and furnishings. Focusing on all of these aspects will assist you to accomplish reliable passive style.

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Energy-efficient glazing makes your house more comfortable and drastically reduces your energy expenses. Improper or improperly designed glazing can be a significant source of unwanted heat gain in summer and substantial heat loss and condensation in winter season. As much as 87% of a home's heating energy can be gotten and as much as 40% lost through windows.

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Glazing is a substantial financial investment in the quality of your home. An initial financial investment in energy-efficient windows, skylights and doors can greatly reduce your yearly heating and cooling expense.

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This tool compares window selections to a base level aluminium window with 3mm clear glass. Understanding a few of the crucial properties of glass will assist you to pick the finest glazing for your house. Secret homes of glass Source: Adapted from the Australian Window Association The amount of light that goes through the glazing is known as visible light transmittance (VLT) or visible transmittance (VT).

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The U worth for windows (expressed as Uw), describes the conduction of the whole window (glass and frame together). The lower the U worth, the higher a window's resistance to heat circulation 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 season's night when it is 15C cooler outside compared to inside, the heat loss through the windows would be: 6. 2 15 70 = 6510W That is equivalent to the total heat output of a big room gas heating system or a 6.

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If you select a window with half the U value (3. 1W/m2 C) (for instance, double glazing with an argon-filled gap 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 easily 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 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 incidence of 0 and the window will experience the maximum possible solar heat gain. The SHGC declared by glazing producers is always determined as having a 0 angle of incidence. As the angle increases, more solar radiation is reflected, and less is transferred.