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Glazing simply implies the windows in your home, consisting of both openable and fixed windows, along with doors with glass and skylights. Glazing really simply implies the glass part, however it is normally utilized to refer to all aspects of an assembly including glass, movies, frames and home furnishings. Focusing on all of these aspects will help you to attain effective passive design.
Energy-efficient glazing makes your house more comfy and drastically minimizes your energy expenses. However, unsuitable or badly designed glazing can be a major source of undesirable heat gain in summer season and substantial heat loss and condensation in winter season. Approximately 87% of a home's heating energy can be acquired and up to 40% lost through windows.
Glazing is a significant financial investment in the quality of your home. A preliminary investment in energy-efficient windows, skylights and doors can significantly lower your yearly heating and cooling bill.
This tool compares window choices to a base level aluminium window with 3mm clear glass. Understanding a few of the key properties of glass will help you to select the finest glazing for your house. Key homes of glass Source: Adapted from the Australian Window Association The amount of light that travels through the glazing is referred to as visible light transmittance (VLT) or noticeable transmittance (VT).
The U value 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 much better its insulating worth.
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 indoors, the heat loss through the windows would be: 6. 2 15 70 = 6510W That is comparable to the total heat output of a big room gas heater or a 6.
If you select a window with half the U value (3. 1W/m2 C) (for instance, 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 easily heat from direct sunshine streams through an entire window (glass and frame together).
The lower a window's SHGC, the less solar heat it transfers to the home interior. The actual SHGC for windows is affected by the angle that solar radiation strikes the glass.
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 manufacturers is constantly determined as having a 0 angle of incidence. As the angle increases, more solar radiation is shown, and less is transferred.
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