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Glazing simply indicates the windows in your home, including both openable and set windows, in addition to doors with glass and skylights. Glazing really just indicates the glass part, however it is normally used to describe all aspects of an assembly including glass, films, frames and home furnishings. Paying attention to all of these aspects will assist you to accomplish efficient passive design.

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Energy-efficient glazing makes your house more comfy and significantly lowers your energy costs. Improper or badly designed glazing can be a significant source of undesirable heat gain in summer and considerable heat loss and condensation in winter. Up to 87% of a house's heating energy can be gained and approximately 40% lost through windows.

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Glazing is a significant investment in the quality of your house. The cost of glazing and the cost of heating and cooling your home are closely related. A preliminary investment in energy-efficient windows, skylights and doors can greatly lower your annual cooling and heating costs. Energy-efficient glazing also lowers the peak heating and cooling load, which can decrease the needed size of an air-conditioning system by 30%, resulting in additional 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 homes of glass will assist you to pick the best glazing for your house. Key properties of glass Source: Adapted from the Australian Window Association The amount of light that goes through the glazing is called noticeable light transmittance (VLT) or noticeable transmittance (VT).

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The U value for windows (revealed as Uw), describes 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 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 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 equivalent to the total heat output of a big room gas heater 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 sunshine streams through a whole window (glass and frame together).

The lower a window's SHGC, the less solar heat it transfers to your 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 called the angle of incidence.

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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 stated by glazing producers is always determined as having a 0 angle of incidence. As the angle increases, more solar radiation is shown, and less is transmitted.