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Glazing just suggests the windows in your house, consisting of both openable and fixed windows, in addition to doors with glass and skylights. Glazing actually simply means the glass part, however it is usually used to refer to all aspects of an assembly consisting of glass, movies, frames and home furnishings. Paying attention to 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 drastically decreases your energy expenses. Inappropriate or improperly developed glazing can be a major source of undesirable heat gain in summer and substantial heat loss and condensation in winter season. Approximately 87% of a house's heating energy can be gotten and up to 40% lost through windows.

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Glazing is a considerable financial investment in the quality of your home. A preliminary investment in energy-efficient windows, skylights and doors can greatly lower 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. Understanding some of the key properties of glass will help you to choose the very best glazing for your home. Key homes of glass Source: Adapted from the Australian Window Association The amount of light that goes through the glazing is called noticeable light transmittance (VLT) or noticeable transmittance (VT).

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The U value for windows (expressed as Uw), describes 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 much better its insulating value.

For example, 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's night when it is 15C colder outside compared to inside your home, the heat loss through the windows would be: 6. 2 15 70 = 6510W That is comparable to the overall 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 halve the heat loss: 3. 1 15 70 = 3255W The solar heat gain coefficient (SHGC) for windows (expressed 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 sends to the house interior. Glazing producers state an SHGC for each window type and style. However, the real 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 stated by glazing makers is always determined as having a 0 angle of incidence. As the angle increases, more solar radiation is reflected, and less is sent.