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Glazing merely suggests the windows in your house, including both openable and set windows, along with doors with glass and skylights. Glazing really just implies the glass part, but it is generally used to refer to all aspects of an assembly including glass, movies, frames and home furnishings. Taking note of all of these aspects will help you to achieve effective passive design.

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Energy-efficient glazing makes your home more comfortable and drastically decreases your energy expenses. Nevertheless, unsuitable or badly designed glazing can be a major source of undesirable heat gain in summer and considerable heat loss and condensation in winter season. Up to 87% of a house's heating energy can be gained and approximately 40% lost through windows.

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Glazing is a substantial investment in the quality of your house. An initial investment in energy-efficient windows, skylights and doors can significantly decrease your annual heating and cooling expense.

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This tool compares window choices to a base level aluminium window with 3mm clear glass. Comprehending a few of the essential homes of glass will help you to choose the finest glazing for your house. Secret homes of glass Source: Adapted 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 (revealed as Uw), describes the conduction of the whole window (glass and frame together). The lower the U worth, the greater a window's resistance to heat circulation 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 season's night when it is 15C chillier 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 heating unit or a 6.

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If you pick 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 (expressed as SHGCw) measures how readily heat from direct sunshine flows through a whole window (glass and frame together).

The lower a window's SHGC, the less solar heat it transmits to the home interior. Glazing producers 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 referred to as the angle of incidence.

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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 optimum possible solar heat gain. The SHGC declared by glazing producers is constantly computed as having a 0 angle of incidence. As the angle increases, more solar radiation is reflected, and less is transmitted.