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Glazing simply implies the windows in your home, including both openable and set windows, along with doors with glass and skylights. Glazing in fact 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 aspects will help you to accomplish efficient passive style.

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Energy-efficient glazing makes your house more comfortable and dramatically reduces your energy costs. However, improper or inadequately designed glazing can be a significant source of unwanted heat gain in summer and substantial heat loss and condensation in winter. As much as 87% of a house'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. An initial financial investment in energy-efficient windows, skylights and doors can significantly reduce your yearly heating and cooling bill.

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This tool compares window choices to a base level aluminium window with 3mm clear glass. Understanding a few of the essential properties of glass will assist you to choose the very best glazing for your house. Secret homes of glass Source: Adjusted from the Australian Window Association The quantity of light that goes through the glazing is known as noticeable light transmittance (VLT) or visible transmittance (VT).

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The U value for windows (expressed 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 circulation and the better its insulating value.

For example, 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 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 large room gas heating unit or a 6.

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If you choose a window with half the U value (3. 1W/m2 C) (for example, double glazing with an argon-filled gap and less-conductive frames), you can cut in half the heat loss: 3. 1 15 70 = 3255W The solar heat gain coefficient (SHGC) for windows (revealed as SHGCw) measures 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 transmits to your house interior. Glazing makers state an SHGC for each window type and design. However, 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 stated by glazing manufacturers is always computed as having a 0 angle of incidence. As the angle increases, more solar radiation is shown, and less is transmitted.