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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 really simply suggests the glass part, however it is usually used to refer to all elements of an assembly including glass, movies, frames and home furnishings. Focusing on all of these aspects will assist you to attain reliable passive design.

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Energy-efficient glazing makes your home more comfy and considerably lowers your energy costs. However, improper or badly created glazing can be a significant source of unwanted heat gain in summertime and substantial heat loss and condensation in winter. Up to 87% of a home's heating energy can be gained and approximately 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 expense of heating and cooling your home are closely associated. An initial investment in energy-efficient windows, skylights and doors can significantly decrease your annual cooling and heating 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 further expense savings.

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This tool compares window selections to a base level aluminium window with 3mm clear glass. Comprehending some of the key homes of glass will assist you to choose the best glazing for your house. Secret properties of glass Source: Adjusted from the Australian Window Association The amount of light that passes 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 greater a window's resistance to heat circulation and the much better its insulating worth.

For example, if your home 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, 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 choose 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 halve 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 streams through an entire window (glass and frame together).

The lower a window's SHGC, the less solar heat it transmits to the house interior. Glazing manufacturers state an SHGC for each window type and style. However, the real SHGC for windows is affected 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 occurrence of 0 and the window will experience the optimum possible solar heat gain. The SHGC declared by glazing makers is always calculated as having a 0 angle of incidence. As the angle increases, more solar radiation is reflected, and less is sent.