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Glazing just indicates the windows in your house, including both openable and fixed windows, in addition to doors with glass and skylights. Glazing really simply suggests the glass part, but it is normally utilized to refer to all aspects of an assembly consisting of glass, films, frames and furnishings. Paying attention to all of these aspects will help you to achieve effective passive design.

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Energy-efficient glazing makes your house more comfy and considerably reduces your energy expenses. However, inappropriate or poorly designed glazing can be a major source of unwanted heat gain in summer and significant heat loss and condensation in winter season. Up to 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 considerable financial investment in the quality of your house. The expense of glazing and the expense of heating and cooling your home are carefully related. An initial financial investment in energy-efficient windows, skylights and doors can greatly lower your annual heating and cooling bill. Energy-efficient glazing also minimizes the peak heating and cooling load, which can reduce the needed size of an air-conditioning system by 30%, causing more expense savings.

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This tool compares window selections to a base level aluminium window with 3mm clear glass. Understanding some of the crucial properties of glass will assist you to choose the finest glazing for your house. Key properties of glass Source: Adapted from the Australian Window Association The quantity of light that travels through the glazing is understood as noticeable light transmittance (VLT) or noticeable transmittance (VT).

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The U worth for windows (expressed as Uw), describes 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 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 your home, 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 heating system 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 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 (expressed as SHGCw) measures 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 transmits 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 maximum possible solar heat gain. The SHGC stated by glazing makers is always computed as having a 0 angle of occurrence. As the angle increases, more solar radiation is shown, and less is transferred.