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Glazing merely means the windows in your house, consisting of both openable and set windows, as well as doors with glass and skylights. Glazing really just suggests the glass part, but it is usually used to refer to all elements of an assembly consisting of glass, movies, frames and furnishings. Focusing on all of these aspects will help you to attain effective passive design.

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Energy-efficient glazing makes your house more comfy and considerably minimizes your energy costs. Improper or poorly created glazing can be a major source of undesirable heat gain in summertime and considerable heat loss and condensation in winter. Approximately 87% of a home's heating energy can be acquired and up to 40% lost through windows.

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Glazing is a considerable investment in the quality of your home. An initial financial investment in energy-efficient windows, skylights and doors can greatly minimize 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. Comprehending some of the crucial homes of glass will help you to choose the finest glazing for your house. Secret properties of glass Source: Adapted from the Australian Window Association The quantity of light that goes through the glazing is called visible light transmittance (VLT) or visible transmittance (VT).

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This might lead you to turn on lights, which will result in higher energy expenses. Conduction is how easily a material carries out heat. This is called the U worth. The U value for windows (revealed 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 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 your home, 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 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) measures how readily 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 house interior. Glazing makers declare an SHGC for each window type and design. However, the actual SHGC for windows is affected by the angle that solar radiation strikes the glass. This is known 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 manufacturers is always determined as having a 0 angle of incidence. As the angle increases, more solar radiation is reflected, and less is sent.