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

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Energy-efficient glazing makes your home more comfortable and dramatically decreases your energy costs. Nevertheless, unsuitable or poorly developed glazing can be a major source of undesirable heat gain in summertime and significant heat loss and condensation in winter. Up to 87% of a house's heating energy can be acquired and approximately 40% lost through windows.

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Glazing is a considerable financial investment in the quality of your house. The expense of glazing and the cost of heating and cooling your house are carefully related. An initial financial investment in energy-efficient windows, skylights and doors can significantly minimize your annual cooling and heating costs. Energy-efficient glazing also reduces the peak heating and cooling load, which can reduce the required size of an air-conditioning system by 30%, leading to further 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 essential properties of glass will assist you to choose the very best glazing for your home. Secret properties of glass Source: Adjusted from the Australian Window Association The quantity of light that passes through the glazing is called noticeable light transmittance (VLT) or noticeable transmittance (VT).

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The U worth for windows (expressed as Uw), explains the conduction of the whole window (glass and frame together). The lower the U value, the higher a window's resistance to heat circulation and the much better its insulating value.

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 season's night when it is 15C cooler outside compared to indoors, the heat loss through the windows would be: 6. 2 15 70 = 6510W That is comparable to the overall 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 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 (revealed as SHGCw) determines 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 transmits to your house interior. Glazing producers state an SHGC for each window type and style. The real SHGC for windows is affected by the angle that solar radiation strikes the glass. This is called 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 optimum possible solar heat gain. The SHGC stated by glazing manufacturers is always computed as having a 0 angle of incidence. As the angle increases, more solar radiation is reflected, and less is transferred.