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Glazing just implies the windows in your house, consisting of both openable and set windows, along with doors with glass and skylights. Glazing actually just suggests the glass part, but it is usually used to describe all aspects of an assembly consisting of glass, films, frames and home 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 considerably decreases your energy expenses. Unsuitable or improperly designed glazing can be a major source of undesirable heat gain in summertime and substantial heat loss and condensation in winter. 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 substantial financial investment in the quality of your house. The cost of glazing and the cost of heating and cooling your home are closely related. A preliminary financial investment in energy-efficient windows, skylights and doors can considerably lower your yearly cooling and heating costs. Energy-efficient glazing likewise reduces the peak heating and cooling load, which can minimize the required size of an air-conditioning system by 30%, leading to additional expense savings.

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

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This might lead you to turn on lights, which will result in greater energy costs. Conduction is how easily a material carries out heat. This is understood as the U value. The U worth for windows (expressed as Uw), describes the conduction of the entire window (glass and frame together). The lower the U value, the greater a window's resistance to heat circulation and the much better its insulating value.

For example, 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 colder outside compared with indoors, the heat loss through the windows would be: 6. 2 15 70 = 6510W That is equivalent 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 worth (3. 1W/m2 C) (for instance, double glazing with an argon-filled gap 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 (expressed as SHGCw) determines how readily heat from direct sunshine streams through an entire window (glass and frame together).

The lower a window's SHGC, the less solar heat it sends to the home interior. Glazing makers state 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 referred to as the angle of occurrence.

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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 maximum possible solar heat gain. The SHGC declared by glazing makers is constantly determined as having a 0 angle of occurrence. As the angle increases, more solar radiation is reflected, and less is transmitted.