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Glazing just suggests the windows in your house, including both openable and fixed windows, along with doors with glass and skylights. Glazing actually just means the glass part, but it is normally used to refer to all aspects of an assembly consisting of glass, movies, frames and home furnishings. Taking note of all of these elements will assist you to attain effective passive design.

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Energy-efficient glazing makes your home more comfortable and dramatically reduces your energy costs. Improper or badly developed glazing can be a significant source of undesirable heat gain in summer and substantial heat loss and condensation in winter. Approximately 87% of a home's heating energy can be acquired and approximately 40% lost through windows.

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

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This tool compares window selections to a base level aluminium window with 3mm clear glass. Comprehending some of the key properties of glass will assist you to pick the very best glazing for your home. Secret properties of glass Source: Adapted from the Australian Window Association The amount of light that passes through the glazing is called noticeable light transmittance (VLT) or visible 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 higher 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 worth of 6. 2W/m2 C, on a winter season's night when it is 15C colder outside compared to inside, the heat loss through the windows would be: 6. 2 15 70 = 6510W That is comparable to the overall 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 value (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 sunlight 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 makers 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 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 manufacturers is always determined as having a 0 angle of occurrence. As the angle increases, more solar radiation is shown, and less is sent.