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Glazing simply indicates the windows in your house, including both openable and fixed windows, in addition to doors with glass and skylights. Glazing really simply means the glass part, but it is typically used to describe all aspects of an assembly including glass, films, frames and furnishings. Taking notice of all of these elements will assist you to accomplish efficient passive design.

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Energy-efficient glazing makes your home more comfortable and drastically decreases your energy costs. Improper or badly designed glazing can be a significant source of unwanted heat gain in summer and significant heat loss and condensation in winter season. Approximately 87% of a home's heating energy can be gotten and up to 40% lost through windows.

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Glazing is a significant financial investment in the quality of your home. The cost of glazing and the cost of heating and cooling your home are closely related. An initial investment in energy-efficient windows, skylights and doors can considerably decrease your annual heating and cooling expense. Energy-efficient glazing also reduces the peak heating and cooling load, which can minimize the required size of an air-conditioning system by 30%, leading to additional cost savings.

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This tool compares window choices to a base level aluminium window with 3mm clear glass. Understanding a few of the key homes of glass will assist 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 known as visible light transmittance (VLT) or visible transmittance (VT).

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This might lead you to change on lights, which will result in higher energy costs. Conduction is how readily a product carries out heat. This is referred to as the U worth. The U value for windows (revealed as Uw), describes the conduction of the entire 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.

For instance, 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's night when it is 15C colder 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 big space 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 example, 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 (revealed as SHGCw) determines how readily heat from direct sunlight streams through a whole window (glass and frame together).

The lower a window's SHGC, the less solar heat it transfers to your home interior. Glazing makers declare an SHGC for each window type and design. The actual SHGC for windows is affected by the angle that solar radiation strikes the glass. This is referred to as the angle of occurrence.

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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 determined as having a 0 angle of incidence. As the angle increases, more solar radiation is shown, and less is transmitted.