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Glazing merely means the windows in your house, including both openable and fixed windows, as well as doors with glass and skylights. Glazing in fact simply means the glass part, however it is typically utilized to describe all aspects of an assembly including glass, movies, frames and furnishings. Taking note of all of these aspects will assist you to achieve effective passive style.

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Energy-efficient glazing makes your house more comfy and significantly decreases your energy costs. Inappropriate or inadequately developed glazing can be a significant source of unwanted heat gain in summer and substantial heat loss and condensation in winter season. Approximately 87% of a house's heating energy can be gained and approximately 40% lost through windows.

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Glazing is a significant financial investment in the quality of your home. An initial financial investment in energy-efficient windows, skylights and doors can significantly minimize your annual heating and cooling bill.

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This tool compares window choices to a base level aluminium window with 3mm clear glass. Understanding a few of the crucial properties of glass will help you to pick the best glazing for your house. Key homes of glass Source: Adapted from the Australian Window Association The quantity of light that passes through the glazing is called noticeable 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 circulation and the much better its insulating value.

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, the heat loss through the windows would be: 6. 2 15 70 = 6510W That is comparable to the total heat output of a big 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 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) determines how easily heat from direct sunshine streams through a whole 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 occurrence of 0 and the window will experience the optimum possible solar heat gain. The SHGC stated by glazing producers is always calculated as having a 0 angle of incidence. As the angle increases, more solar radiation is shown, and less is transferred.