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Glazing simply means the windows in your house, including both openable and fixed windows, along with doors with glass and skylights. Glazing in fact simply suggests the glass part, but it is usually utilized to refer to all elements of an assembly including glass, films, frames and furnishings. Paying attention to all of these aspects will help you to achieve efficient passive design.

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Energy-efficient glazing makes your home more comfy and significantly lowers your energy expenses. Nevertheless, inappropriate or poorly designed glazing can be a major source of undesirable heat gain in summer and substantial 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 significant investment in the quality of your house. The expense 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 minimize your annual heating & cooling costs. Energy-efficient glazing likewise lowers the peak heating and cooling load, which can minimize the needed size of an air-conditioning system by 30%, resulting in more cost savings.

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This tool compares window selections to a base level aluminium window with 3mm clear glass. Comprehending some of the key properties of glass will help you to choose the best glazing for your home. Secret residential or commercial properties of glass Source: Adjusted from the Australian Window Association The amount of light that travels through the glazing is known as visible light transmittance (VLT) or noticeable transmittance (VT).

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The U worth for windows (revealed as Uw), describes 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 cooler outside compared with inside your home, the heat loss through the windows would be: 6. 2 15 70 = 6510W That is comparable to the total heat output of a big space gas heating unit or a 6.

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If you pick 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 (revealed as SHGCw) measures how easily heat from direct sunshine flows through a whole window (glass and frame together).

The lower a window's SHGC, the less solar heat it sends 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 stated by glazing manufacturers is constantly calculated as having a 0 angle of incidence. As the angle increases, more solar radiation is reflected, and less is transferred.