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Glazing simply implies the windows in your home, including both openable and set windows, as well as doors with glass and skylights. Glazing really simply implies the glass part, however it is normally used to describe all aspects of an assembly consisting of glass, films, frames and home furnishings. Paying attention to all of these aspects will assist you to accomplish efficient passive design.

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Energy-efficient glazing makes your home more comfortable and dramatically reduces your energy expenses. Unsuitable or badly created glazing can be a significant 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 acquired and up to 40% lost through windows.

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Glazing is a significant investment in the quality of your home. The expense of glazing and the expense of heating and cooling your home are carefully related. A preliminary financial investment in energy-efficient windows, skylights and doors can significantly decrease your yearly heating and cooling costs. Energy-efficient glazing likewise decreases the peak heating and cooling load, which can decrease the required size of an air-conditioning system by 30%, leading to further expense 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 crucial residential or commercial properties of glass will help you to select the very best glazing for your house. Key homes of glass Source: Adapted from the Australian Window Association The amount of light that travels through the glazing is referred to as visible light transmittance (VLT) or noticeable transmittance (VT).

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The U worth for windows (revealed as Uw), explains 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 much better its insulating value.

For instance, 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's night when it is 15C colder outside compared to inside, the heat loss through the windows would be: 6. 2 15 70 = 6510W That is equivalent to the overall heat output of a big space 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 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 sunlight flows through a whole window (glass and frame together).

The lower a window's SHGC, the less solar heat it sends to the home interior. The actual SHGC for windows is affected 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 declared by glazing producers is constantly determined as having a 0 angle of incidence. As the angle increases, more solar radiation is reflected, and less is transmitted.