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Glazing simply indicates the windows in your house, consisting of both openable and set windows, in addition to doors with glass and skylights. Glazing in fact simply suggests the glass part, but it is usually used to refer to all elements of an assembly consisting of glass, films, frames and home furnishings. Taking note of all of these aspects will assist you to achieve reliable passive design.

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Energy-efficient glazing makes your home more comfortable and significantly minimizes your energy costs. Inappropriate or badly developed glazing can be a major source of undesirable heat gain in summertime and considerable heat loss and condensation in winter. Approximately 87% of a home's heating energy can be acquired and approximately 40% lost through windows.

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Glazing is a significant investment in the quality of your home. The cost of glazing and the cost of heating and cooling your home are carefully related. An initial financial investment in energy-efficient windows, skylights and doors can significantly minimize your annual cooling and heating expense. Energy-efficient glazing also decreases the peak heating and cooling load, which can minimize the needed size of an air-conditioning system by 30%, resulting in further cost savings.

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This tool compares window selections to a base level aluminium window with 3mm clear glass. Understanding a few of the crucial properties of glass will help you to pick the very best glazing for your home. Secret residential or commercial properties of glass Source: Adapted from the Australian Window Association The amount of light that passes through the glazing is called visible light transmittance (VLT) or visible 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 circulation and the better its insulating value.

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 cooler outside compared with inside, the heat loss through the windows would be: 6. 2 15 70 = 6510W That is comparable to the total 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 worth (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 (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 transfers to your house interior. Glazing makers state an SHGC for each window type and design. Nevertheless, the real SHGC for windows is affected by the angle that solar radiation strikes the glass. This is referred to as 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 makers is always determined as having a 0 angle of incidence. As the angle increases, more solar radiation is shown, and less is sent.