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Glazing merely indicates the windows in your house, including both openable and fixed windows, as well as doors with glass and skylights. Glazing actually just means the glass part, but it is usually used to refer to all elements of an assembly including glass, movies, frames and furnishings. Taking note of all of these aspects will help you to achieve reliable passive design.

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Energy-efficient glazing makes your home more comfy and dramatically minimizes your energy expenses. However, inappropriate or improperly designed glazing can be a significant 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 considerable financial investment in the quality of your house. A preliminary investment in energy-efficient windows, skylights and doors can significantly minimize 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. Understanding some of the essential residential or commercial properties of glass will assist you to choose the finest glazing for your house. Secret properties of glass Source: Adjusted from the Australian Window Association The quantity of light that goes through the glazing is understood as noticeable light transmittance (VLT) or visible transmittance (VT).

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The U worth for windows (expressed as Uw), explains the conduction of the whole window (glass and frame together). The lower the U value, the greater a window's resistance to heat flow and the better its insulating value.

For instance, 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 colder outside compared with 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 big space 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 (expressed as SHGCw) determines how readily 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. Glazing manufacturers declare an SHGC for each window type and design. The actual SHGC for windows is impacted by the angle that solar radiation strikes the glass. This is referred to as the angle of occurrence.

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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 producers is always calculated as having a 0 angle of occurrence. As the angle increases, more solar radiation is reflected, and less is transmitted.