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Glazing just means the windows in your house, including both openable and set windows, as well as doors with glass and skylights. Glazing in fact simply suggests the glass part, but it is typically used to describe all aspects of an assembly consisting of glass, movies, frames and furnishings. Taking notice of all of these aspects will help you to accomplish efficient passive style.

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Energy-efficient glazing makes your home more comfortable and dramatically lowers your energy expenses. However, inappropriate or poorly developed glazing can be a significant source of undesirable heat gain in summer season and considerable heat loss and condensation in winter. Approximately 87% of a home's heating energy can be gotten and up to 40% lost through windows.

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Glazing is a considerable investment in the quality of your home. A preliminary financial 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 selections to a base level aluminium window with 3mm clear glass. Understanding some of the key residential or commercial properties of glass will assist you to choose the very best glazing for your house. Key homes of glass Source: Adjusted from the Australian Window Association The quantity of light that passes 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), explains the conduction of the whole window (glass and frame together). The lower the U worth, the greater a window's resistance to heat flow and the 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 cooler outside compared to indoors, the heat loss through the windows would be: 6. 2 15 70 = 6510W That is comparable to the overall heat output of a big space gas heating unit or a 6.

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If you select a window with half the U worth (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 (revealed as SHGCw) determines how easily heat from direct sunshine flows through an entire window (glass and frame together).

The lower a window's SHGC, the less solar heat it transmits to the house interior. Glazing manufacturers state 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 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 makers is always calculated as having a 0 angle of incidence. As the angle increases, more solar radiation is reflected, and less is sent.