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Glazing simply means the windows in your house, consisting of both openable and fixed windows, as well as doors with glass and skylights. Glazing actually simply means the glass part, however it is generally used to describe all aspects of an assembly including glass, movies, frames and furnishings. Taking notice of all of these elements will help you to attain reliable passive style.

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Energy-efficient glazing makes your house more comfortable and drastically minimizes your energy costs. However, inappropriate or poorly designed glazing can be a major source of unwanted heat gain in summertime and considerable heat loss and condensation in winter. Approximately 87% of a house's heating energy can be acquired and up to 40% lost through windows.

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Glazing is a considerable financial investment in the quality of your home. A preliminary investment in energy-efficient windows, skylights and doors can considerably decrease your annual heating and cooling bill.

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This tool compares window selections to a base level aluminium window with 3mm clear glass. Understanding some 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: Adjusted from the Australian Window Association The quantity of light that travels through the glazing is known as noticeable 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 value, the greater a window's resistance to heat flow and the better its insulating worth.

For example, if your home 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 to 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 space gas heater or a 6.

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If you choose a window with half the U value (3. 1W/m2 C) (for example, 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) determines 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 transfers to the home interior. Glazing makers declare an SHGC for each window type and style. Nevertheless, the actual SHGC for windows is impacted by the angle that solar radiation strikes the glass. This is understood as 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 maximum possible solar heat gain. The SHGC stated by glazing makers is always determined as having a 0 angle of incidence. As the angle increases, more solar radiation is shown, and less is transferred.