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Glazing merely implies the windows in your house, consisting of both openable and fixed windows, along with doors with glass and skylights. Glazing really simply suggests the glass part, however it is normally utilized to describe all aspects of an assembly including glass, movies, frames and furnishings. Focusing on all of these aspects will help you to accomplish reliable passive design.

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Energy-efficient glazing makes your house more comfortable and drastically decreases your energy costs. However, improper or poorly developed glazing can be a significant source of unwanted heat gain in summertime and substantial heat loss and condensation in winter. As much as 87% of a home's heating energy can be acquired and as much as 40% lost through windows.

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Glazing is a significant financial investment in the quality of your house. An initial investment in energy-efficient windows, skylights and doors can greatly reduce your yearly heating and cooling bill.

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This tool compares window selections to a base level aluminium window with 3mm clear glass. Comprehending some of the crucial properties of glass will assist you to select the very best glazing for your house. Key residential or commercial properties of glass Source: Adapted from the Australian Window Association The amount of light that goes through the glazing is called visible light transmittance (VLT) or visible transmittance (VT).

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This might lead you to turn on lights, which will result in higher energy costs. Conduction is how easily a product carries out heat. This is understood as the U value. The U worth for windows (revealed as Uw), describes 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 better its insulating worth.

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 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 room 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 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) 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 sends to your house interior. Glazing producers declare an SHGC for each window type and style. However, the real SHGC for windows is affected 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 stated by glazing manufacturers is constantly computed as having a 0 angle of incidence. As the angle increases, more solar radiation is reflected, and less is transmitted.