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Glazing merely means the windows in your house, consisting of both openable and fixed windows, in addition to doors with glass and skylights. Glazing really just implies the glass part, however it is normally used to describe all elements of an assembly consisting of glass, films, frames and home furnishings. Paying attention to all of these elements will assist you to accomplish efficient passive design.

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Energy-efficient glazing makes your home more comfortable and considerably lowers your energy costs. Improper or poorly developed glazing can be a major source of unwanted heat gain in summer season and significant heat loss and condensation in winter season. Approximately 87% of a home's heating energy can be acquired and as much as 40% lost through windows.

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Glazing is a considerable investment in the quality of your house. An initial 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 choices to a base level aluminium window with 3mm clear glass. Understanding some of the crucial residential or commercial properties of glass will assist you to select the very best glazing for your house. Key residential or commercial properties of glass Source: Adjusted from the Australian Window Association The quantity of light that travels 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 costs. Conduction is how readily a material conducts heat. This is called the U value. The U value for windows (expressed 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 flow and the better its insulating worth.

For example, 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's night when it is 15C chillier outside compared to indoors, the heat loss through the windows would be: 6. 2 15 70 = 6510W That is equivalent to the overall heat output of a big room gas heater or a 6.

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If you select a window with half the U worth (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) 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 transmits to the home interior. The real SHGC for windows is impacted 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 declared by glazing producers is always determined as having a 0 angle of occurrence. As the angle increases, more solar radiation is reflected, and less is transferred.