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Glazing simply implies the windows in your house, including both openable and fixed windows, as well as doors with glass and skylights. Glazing really just suggests the glass part, but it is normally used to refer to all elements of an assembly including glass, films, frames and furnishings. Taking notice of all of these elements will assist you to accomplish effective passive design.

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Energy-efficient glazing makes your home more comfy and dramatically reduces your energy costs. Improper or badly 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 acquired and up to 40% lost through windows.

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Glazing is a considerable financial investment in the quality of your home. The cost of glazing and the cost of heating and cooling your house are carefully associated. An initial financial investment in energy-efficient windows, skylights and doors can greatly lower your annual heating & cooling costs. Energy-efficient glazing also reduces the peak heating and cooling load, which can minimize the needed size of an air-conditioning system by 30%, causing further cost savings.

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This tool compares window selections to a base level aluminium window with 3mm clear glass. Comprehending a few of the key properties of glass will help you to pick the very best glazing for your home. Secret homes of glass Source: Adjusted from the Australian Window Association The quantity of light that passes through the glazing is called visible light transmittance (VLT) or visible transmittance (VT).

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The U value for windows (expressed 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.

For example, 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 with indoors, the heat loss through the windows would be: 6. 2 15 70 = 6510W That is equivalent to the overall heat output of a big room gas heating unit or a 6.

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If you select a window with half the U value (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) 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 sends to your house interior. Glazing makers state an SHGC for each window type and design. The real SHGC for windows is impacted by the angle that solar radiation strikes the glass. This is called 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 maximum possible solar heat gain. The SHGC declared by glazing producers is always computed as having a 0 angle of occurrence. As the angle increases, more solar radiation is reflected, and less is transferred.