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Glazing simply implies the windows in your house, consisting of both openable and set windows, as well as doors with glass and skylights. Glazing really simply means the glass part, but it is typically utilized to refer to all elements of an assembly consisting of glass, films, frames and home furnishings. Paying attention to all of these aspects will help you to accomplish efficient passive design.

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Energy-efficient glazing makes your home more comfortable and dramatically reduces your energy costs. Unsuitable or inadequately designed glazing can be a major source of undesirable heat gain in summer season and substantial heat loss and condensation in winter season. As much as 87% of a home's heating energy can be gotten and up to 40% lost through windows.

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Glazing is a significant investment in the quality of your house. The cost of glazing and the expense of heating and cooling your home are closely related. A preliminary investment in energy-efficient windows, skylights and doors can significantly decrease your annual heating & cooling costs. Energy-efficient glazing also lowers the peak heating and cooling load, which can lower the needed size of an air-conditioning system by 30%, resulting in further expense savings.

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This tool compares window selections to a base level aluminium window with 3mm clear glass. Comprehending some of the essential properties of glass will help you to choose the best glazing for your home. Secret residential or commercial properties of glass Source: Adapted from the Australian Window Association The amount of light that goes through the glazing is called noticeable light transmittance (VLT) or noticeable transmittance (VT).

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This may lead you to switch on lights, which will lead to greater energy expenses. Conduction is how readily a material conducts heat. This is referred to as the U worth. The U worth for windows (expressed 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 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 cooler outside compared with inside, 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 heater or a 6.

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If you select 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 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 a whole window (glass and frame together).

The lower a window's SHGC, the less solar heat it transfers to the home 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 incidence of 0 and the window will experience the optimum possible solar heat gain. The SHGC declared by glazing makers is constantly calculated as having a 0 angle of occurrence. As the angle increases, more solar radiation is shown, and less is sent.