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Glazing merely indicates the windows in your home, including both openable and set windows, in addition to doors with glass and skylights. Glazing in fact just implies the glass part, however it is normally used to describe all elements of an assembly including glass, films, frames and furnishings. Taking note of all of these aspects will assist you to achieve effective passive design.

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Energy-efficient glazing makes your house more comfy and significantly decreases your energy expenses. However, unsuitable or inadequately created glazing can be a major source of unwanted heat gain in summer season and considerable heat loss and condensation in winter season. Up to 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 considerable financial investment in the quality of your house. The cost of glazing and the expense of heating and cooling your home are closely related. A preliminary financial investment in energy-efficient windows, skylights and doors can greatly lower your annual heating & cooling bill. Energy-efficient glazing also decreases the peak heating and cooling load, which can decrease the needed size of an air-conditioning system by 30%, resulting in more cost savings.

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This tool compares window choices to a base level aluminium window with 3mm clear glass. Comprehending some of the key homes of glass will help you to choose the very best glazing for your house. Key residential or commercial properties of glass Source: Adapted from the Australian Window Association The quantity of light that travels through the glazing is referred to as visible light transmittance (VLT) or noticeable 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 value, the higher a window's resistance to heat flow and the much better its insulating value.

For instance, if your house has 70m2 of glazing with aluminium frames and clear glass with a U value of 6. 2W/m2 C, on a winter's night when it is 15C colder outside compared to inside your home, the heat loss through the windows would be: 6. 2 15 70 = 6510W That is equivalent to the total heat output of a large space gas heater or a 6.

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If you pick a window with half the U value (3. 1W/m2 C) (for instance, double glazing with an argon-filled gap 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 (revealed as SHGCw) determines how easily 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 home interior. The actual 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 declared by glazing producers is always computed as having a 0 angle of incidence. As the angle increases, more solar radiation is reflected, and less is transferred.