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Glazing merely implies the windows in your house, including both openable and fixed windows, in addition to doors with glass and skylights. Glazing in fact just means the glass part, but it is usually used to describe all elements of an assembly consisting of glass, films, frames and home furnishings. Taking note of all of these elements will help you to accomplish efficient passive style.

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Energy-efficient glazing makes your house more comfortable and dramatically decreases your energy expenses. Unsuitable or badly developed glazing can be a major source of undesirable heat gain in summer and substantial heat loss and condensation in winter season. Up to 87% of a home's heating energy can be gotten and up to 40% lost through windows.

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Glazing is a substantial financial investment in the quality of your home. An initial investment in energy-efficient windows, skylights and doors can greatly decrease your annual heating and cooling costs.

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This tool compares window choices to a base level aluminium window with 3mm clear glass. Understanding some of the essential homes of glass will help you to pick the very best glazing for your house. Secret residential or commercial properties 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 worth for windows (expressed 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 much better its insulating value.

For example, if your home has 70m2 of glazing with aluminium frames and clear glass with a U value of 6. 2W/m2 C, on a winter season's night when it is 15C chillier outside compared to 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 large 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 (revealed as SHGCw) determines 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 your home interior. Glazing manufacturers state an SHGC for each window type and style. The real SHGC for windows is impacted by the angle that solar radiation strikes the glass. This is called 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 constantly determined as having a 0 angle of incidence. As the angle increases, more solar radiation is reflected, and less is transmitted.