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Glazing just suggests the windows in your house, including both openable and fixed windows, in addition to doors with glass and skylights. Glazing in fact simply suggests the glass part, however it is generally utilized to describe all elements of an assembly including glass, movies, frames and furnishings. Paying attention to all of these elements will help you to achieve reliable passive design.

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Energy-efficient glazing makes your home more comfy and dramatically reduces your energy expenses. Improper or inadequately designed glazing can be a major source of unwanted heat gain in summer and substantial heat loss and condensation in winter. As much as 87% of a house's heating energy can be acquired 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 home are closely related. A preliminary investment in energy-efficient windows, skylights and doors can greatly minimize your annual heating and cooling expense. Energy-efficient glazing also lowers the peak heating and cooling load, which can minimize the needed 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. Understanding a few of the key homes of glass will assist you to choose the best glazing for your home. Key residential or commercial properties of glass Source: Adapted 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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This may lead you to change on lights, which will result in higher energy costs. Conduction is how readily a product conducts heat. This is known as the U value. The U worth for windows (revealed as Uw), describes the conduction of the entire window (glass and frame together). The lower the U worth, the higher a window's resistance to heat flow and the much better its insulating worth.

If your home has 70m2 of glazing with aluminium frames and clear glass with a U value of 6. 2W/m2 C, on a winter season's night when it is 15C colder outside compared with indoors, the heat loss through the windows would be: 6. 2 15 70 = 6510W That is comparable to the overall heat output of a big room gas heating unit or a 6.

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If you choose 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 cut in half the heat loss: 3. 1 15 70 = 3255W The solar heat gain coefficient (SHGC) for windows (expressed as SHGCw) determines how readily heat from direct sunlight flows through an entire window (glass and frame together).

The lower a window's SHGC, the less solar heat it sends to your home interior. Glazing manufacturers state an SHGC for each window type and design. The real SHGC for windows is affected by the angle that solar radiation strikes the glass. This is referred to as the angle of occurrence.

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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 makers is always determined as having a 0 angle of incidence. As the angle increases, more solar radiation is reflected, and less is transferred.