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Glazing simply suggests the windows in your house, consisting of both openable and set windows, along with doors with glass and skylights. Glazing in fact just suggests the glass part, but it is typically used to describe all elements of an assembly consisting of glass, films, frames and furnishings. Focusing on all of these aspects will help you to accomplish reliable passive design.

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Energy-efficient glazing makes your house more comfortable and dramatically lowers your energy costs. Unsuitable or inadequately created glazing can be a significant source of unwanted heat gain in summer and considerable heat loss and condensation in winter season. As much as 87% of a house's heating energy can be gotten and as much as 40% lost through windows.

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Glazing is a substantial financial investment in the quality of your house. A preliminary 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 some of the key properties of glass will assist you to choose the very best glazing for your house. Key residential or commercial properties of glass Source: Adapted from the Australian Window Association The quantity of light that passes through the glazing is called visible light transmittance (VLT) or visible transmittance (VT).

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This might lead you to turn on lights, which will result in higher energy costs. Conduction is how easily a material conducts heat. This is referred to as the U value. The U worth for windows (revealed as Uw), describes the conduction of the entire window (glass and frame together). The lower the U worth, the higher a window's resistance to heat circulation and the better its insulating value.

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'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 equivalent to the overall heat output of a big room 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 instance, 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) measures 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 transmits to your home interior. Glazing makers state 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 understood 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 constantly calculated as having a 0 angle of occurrence. As the angle increases, more solar radiation is shown, and less is transferred.