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Glazing just implies the windows in your house, consisting of both openable and fixed windows, as well as doors with glass and skylights. Glazing in fact just indicates the glass part, but it is typically used to describe all elements of an assembly consisting of glass, films, frames and home furnishings. Paying attention to all of these elements will assist you to achieve efficient passive design.

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Energy-efficient glazing makes your home more comfy and drastically reduces your energy costs. However, inappropriate or inadequately designed glazing can be a major source of undesirable heat gain in summertime and substantial heat loss and condensation in winter. Approximately 87% of a house's heating energy can be gained and approximately 40% lost through windows.

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Glazing is a considerable investment in the quality of your house. A preliminary financial investment in energy-efficient windows, skylights and doors can greatly lower your annual heating and cooling bill.

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This tool compares window choices to a base level aluminium window with 3mm clear glass. Comprehending a few of the crucial residential or commercial properties of glass will help you to pick the finest glazing for your home. Secret residential or commercial properties of glass Source: Adjusted from the Australian Window Association The amount of light that travels through the glazing is referred to as noticeable light transmittance (VLT) or visible transmittance (VT).

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The U value 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 worth.

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 cooler outside compared with indoors, the heat loss through the windows would be: 6. 2 15 70 = 6510W That is comparable to the total heat output of a large space gas heater or a 6.

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If you choose a window with half the U worth (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) determines how easily heat from direct sunlight flows through an entire window (glass and frame together).

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

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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 computed as having a 0 angle of occurrence. As the angle increases, more solar radiation is reflected, and less is transferred.