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Glazing simply indicates the windows in your house, including both openable and fixed windows, as well as doors with glass and skylights. Glazing in fact just means the glass part, but it is generally used to describe all aspects of an assembly including glass, movies, frames and home furnishings. Focusing on all of these aspects will help you to achieve reliable passive design.

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Energy-efficient glazing makes your home more comfortable and significantly lowers your energy expenses. However, improper or poorly designed glazing can be a major source of unwanted heat gain in summertime and significant heat loss and condensation in winter season. Approximately 87% of a house'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. An initial investment in energy-efficient windows, skylights and doors can considerably minimize your annual heating and cooling bill.

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This tool compares window selections to a base level aluminium window with 3mm clear glass. Comprehending some of the key homes of glass will help you to choose the very best glazing for your house. Secret homes of glass Source: Adjusted from the Australian Window Association The amount of light that passes through the glazing is referred to as noticeable light transmittance (VLT) or noticeable transmittance (VT).

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

If your house has 70m2 of glazing with aluminium frames and clear glass with a U value of 6. 2W/m2 C, on a winter season's night when it is 15C chillier outside compared to inside your home, the heat loss through the windows would be: 6. 2 15 70 = 6510W That is comparable to the total heat output of a large room gas heater or a 6.

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If you choose a window with half the U value (3. 1W/m2 C) (for instance, double glazing with an argon-filled space 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 transfers to the house 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 stated by glazing makers is always determined as having a 0 angle of occurrence. As the angle increases, more solar radiation is reflected, and less is transmitted.