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Glazing just means the windows in your house, including both openable and fixed windows, as well as doors with glass and skylights. Glazing really just suggests the glass part, but it is usually utilized to describe all elements of an assembly including glass, movies, frames and home furnishings. Focusing on all of these elements will help you to achieve reliable passive design.

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Energy-efficient glazing makes your house more comfortable and drastically reduces your energy expenses. Inappropriate or improperly created glazing can be a major source of undesirable heat gain in summer and significant heat loss and condensation in winter season. Approximately 87% of a home's heating energy can be gotten and as much as 40% lost through windows.

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Glazing is a substantial financial investment in the quality of your home. A preliminary financial investment in energy-efficient windows, skylights and doors can considerably 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 a few of the crucial properties of glass will assist you to pick the best glazing for your home. Key residential or commercial properties of glass Source: Adapted from the Australian Window Association The amount of light that passes through the glazing is called visible light transmittance (VLT) or visible transmittance (VT).

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This may lead you to change on lights, which will lead to greater energy costs. Conduction is how readily a product carries out heat. This is referred to as the U worth. The U worth for windows (expressed as Uw), explains the conduction of the entire window (glass and frame together). The lower the U worth, the greater a window's resistance to heat flow and the much better its insulating worth.

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'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 total heat output of a big space gas heater or a 6.

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If you pick 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 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 sunlight flows through a whole 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. However, the actual SHGC for windows is affected by the angle that solar radiation strikes the glass. This is known as the angle of occurrence.

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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 maximum possible solar heat gain. The SHGC stated by glazing manufacturers is constantly calculated as having a 0 angle of incidence. As the angle increases, more solar radiation is reflected, and less is transmitted.