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Glazing just implies the windows in your house, consisting of both openable and set windows, as well as doors with glass and skylights. Glazing in fact simply implies the glass part, however it is typically utilized to describe all aspects of an assembly consisting of glass, films, frames and furnishings. Paying attention to all of these aspects will help you to accomplish efficient passive style.

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Energy-efficient glazing makes your house more comfy and considerably minimizes your energy costs. Inappropriate or inadequately developed glazing can be a significant source of unwanted heat gain in summertime and significant heat loss and condensation in winter. Up to 87% of a home's heating energy can be gotten and up to 40% lost through windows.

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

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This tool compares window choices to a base level aluminium window with 3mm clear glass. Understanding some of the key properties of glass will assist you to choose the very best glazing for your home. Key homes of glass Source: Adapted from the Australian Window Association The amount of light that goes through the glazing is referred to as visible light transmittance (VLT) or noticeable 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 value, the greater a window's resistance to heat flow and the better its insulating value.

If your house has 70m2 of glazing with aluminium frames and clear glass with a U value of 6. 2W/m2 C, on a winter season'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 big 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 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 (revealed as SHGCw) measures how easily 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 house 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 incidence of 0 and the window will experience the maximum possible solar heat gain. The SHGC stated by glazing manufacturers is constantly determined as having a 0 angle of incidence. As the angle increases, more solar radiation is shown, and less is transmitted.