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Glazing merely means the windows in your house, including both openable and fixed windows, in addition to doors with glass and skylights. Glazing actually just suggests the glass part, however it is generally used to describe all aspects of an assembly including glass, films, frames and home furnishings. Taking notice of all of these elements will assist you to attain effective passive design.

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Energy-efficient glazing makes your home more comfy and drastically decreases your energy expenses. Inappropriate or badly designed glazing can be a significant source of unwanted heat gain in summer and significant heat loss and condensation in winter. As much as 87% of a house's heating energy can be gotten and approximately 40% lost through windows.

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Glazing is a significant financial investment in the quality of your house. The expense of glazing and the expense of heating and cooling your house are closely related. An initial financial investment in energy-efficient windows, skylights and doors can greatly minimize your yearly heating and cooling costs. Energy-efficient glazing also decreases the peak heating and cooling load, which can decrease the needed size of an air-conditioning system by 30%, causing 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 key residential or commercial properties of glass will help you to pick the finest glazing for your house. Secret residential or commercial properties of glass Source: Adjusted from the Australian Window Association The amount of light that travels through the glazing is called noticeable light transmittance (VLT) or visible transmittance (VT).

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The U worth for windows (revealed 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 flow 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 chillier outside compared with inside, the heat loss through the windows would be: 6. 2 15 70 = 6510W That is comparable to the overall heat output of a large room gas heater or a 6.

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If you pick a window with half the U worth (3. 1W/m2 C) (for instance, double glazing with an argon-filled space 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) measures how readily heat from direct sunshine 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. Glazing manufacturers declare an SHGC for each window type and style. However, the actual SHGC for windows is affected by the angle that solar radiation strikes the glass. This is referred to as 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 manufacturers is constantly calculated as having a 0 angle of occurrence. As the angle increases, more solar radiation is reflected, and less is transmitted.