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Glazing simply suggests the windows in your house, including both openable and fixed windows, as well as doors with glass and skylights. Glazing actually just means the glass part, however it is normally used to describe all aspects of an assembly including glass, films, frames and furnishings. Paying attention to all of these elements will assist you to achieve efficient passive design.

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Energy-efficient glazing makes your house more comfortable and drastically decreases your energy expenses. Nevertheless, inappropriate or poorly developed glazing can be a major source of undesirable heat gain in summertime and considerable heat loss and condensation in winter. As much as 87% of a house's heating energy can be acquired and up to 40% lost through windows.

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Glazing is a considerable investment in the quality of your home. The expense of glazing and the expense of heating and cooling your house are closely associated. An initial investment in energy-efficient windows, skylights and doors can significantly minimize your annual heating & cooling costs. Energy-efficient glazing also minimizes the peak heating and cooling load, which can decrease the needed size of an air-conditioning system by 30%, resulting in additional expense savings.

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This tool compares window choices to a base level aluminium window with 3mm clear glass. Comprehending a few of the essential properties of glass will assist you to pick the very best glazing for your home. Secret homes of glass Source: Adapted from the Australian Window Association The quantity of light that passes through the glazing is called visible light transmittance (VLT) or noticeable transmittance (VT).

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This might lead you to turn on lights, which will lead to higher energy expenses. Conduction is how easily a product carries out heat. This is called 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 value, the greater a window's resistance to heat flow and the better its insulating worth.

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 with 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 heating system or a 6.

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If you select a window with half the U worth (3. 1W/m2 C) (for example, double glazing with an argon-filled space and less-conductive frames), you can halve 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 sunshine flows through an entire window (glass and frame together).

The lower a window's SHGC, the less solar heat it sends to the home interior. The real SHGC for windows is impacted by the angle that solar radiation strikes the glass.

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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 always calculated as having a 0 angle of occurrence. As the angle increases, more solar radiation is shown, and less is transmitted.