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Glazing simply implies the windows in your house, including both openable and fixed windows, along with doors with glass and skylights. Glazing actually just indicates the glass part, however it is normally used to refer to all elements of an assembly including glass, movies, frames and home furnishings. Taking notice of all of these elements will assist you to attain reliable passive design.

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Energy-efficient glazing makes your house more comfortable and drastically lowers your energy costs. Inappropriate or improperly developed glazing can be a major source of undesirable heat gain in summer and significant heat loss and condensation in winter. Approximately 87% of a home's heating energy can be gained and as much as 40% lost through windows.

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Glazing is a substantial investment in the quality of your home. The cost of glazing and the cost of heating and cooling your house are carefully related. An initial investment in energy-efficient windows, skylights and doors can greatly reduce your yearly heating & cooling expense. Energy-efficient glazing likewise lowers the peak heating and cooling load, which can decrease the required size of an air-conditioning system by 30%, leading to more cost savings.

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This tool compares window choices to a base level aluminium window with 3mm clear glass. Comprehending a few of the crucial residential or commercial properties of glass will assist you to choose the best glazing for your home. Key residential or commercial properties of glass Source: Adjusted from the Australian Window Association The quantity of light that travels through the glazing is referred to as visible light transmittance (VLT) or visible transmittance (VT).

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The U worth for windows (expressed as Uw), explains the conduction of the whole window (glass and frame together). The lower the U worth, the higher a window's resistance to heat circulation and the better its insulating worth.

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 colder outside compared with inside, 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 select 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 halve 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 sunlight flows through an entire window (glass and frame together).

The lower a window's SHGC, the less solar heat it transfers to the house interior. The real 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 optimum possible solar heat gain. The SHGC declared by glazing manufacturers is constantly calculated as having a 0 angle of occurrence. As the angle increases, more solar radiation is reflected, and less is transmitted.