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Glazing simply means the windows in your house, consisting of both openable and fixed windows, along with doors with glass and skylights. Glazing in fact just indicates the glass part, but it is usually utilized to describe all aspects of an assembly consisting of glass, movies, frames and home furnishings. Paying attention to all of these aspects will help you to attain reliable passive style.

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Energy-efficient glazing makes your house more comfortable and considerably minimizes your energy expenses. Improper or badly designed 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 gained and approximately 40% lost through windows.

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Glazing is a significant financial investment in the quality of your home. The expense of glazing and the cost of heating and cooling your home are closely related. An initial investment in energy-efficient windows, skylights and doors can greatly reduce your yearly heating & cooling bill. Energy-efficient glazing likewise lowers the peak heating and cooling load, which can decrease the required 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 some of the crucial properties of glass will help you to pick the finest glazing for your house. Key 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 noticeable transmittance (VT).

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This may lead you to switch on lights, which will result in higher energy expenses. Conduction is how readily a material carries out heat. This is called the U value. The U worth for windows (revealed as Uw), explains 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 better its insulating value.

For instance, 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 season's night when it is 15C colder outside compared to indoors, the heat loss through the windows would be: 6. 2 15 70 = 6510W That is equivalent to the overall heat output of a big space gas heater or a 6.

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If you select a window with half the U worth (3. 1W/m2 C) (for instance, 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 (revealed as SHGCw) measures how easily heat from direct sunlight flows through an entire window (glass and frame together).

The lower a window's SHGC, the less solar heat it transmits to the house interior. The actual SHGC for windows is affected 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 maximum possible solar heat gain. The SHGC declared 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 sent.