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Glazing simply indicates the windows in your home, including both openable and set windows, as well as doors with glass and skylights. Glazing actually just implies the glass part, however it is generally utilized to refer to all elements of an assembly including glass, movies, frames and furnishings. Taking note of all of these elements will help you to attain efficient passive design.

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Energy-efficient glazing makes your home more comfortable and significantly lowers your energy costs. However, unsuitable or improperly designed glazing can be a significant source of undesirable heat gain in summer and considerable heat loss and condensation in winter. Up to 87% of a house's heating energy can be gotten and approximately 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 financial investment in energy-efficient windows, skylights and doors can significantly decrease your yearly heating and cooling bill. Energy-efficient glazing likewise reduces the peak heating and cooling load, which can lower the required size of an air-conditioning system by 30%, causing more expense savings.

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This tool compares window choices to a base level aluminium window with 3mm clear glass. Understanding some of the essential properties of glass will assist you to pick the finest glazing for your home. Key properties of glass Source: Adjusted from the Australian Window Association The amount of light that passes through the glazing is referred to as noticeable light transmittance (VLT) or visible transmittance (VT).

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This might lead you to switch on lights, which will lead to higher energy costs. Conduction is how readily a product performs heat. This is called the U value. The U value for windows (revealed as Uw), explains the conduction of the entire window (glass and frame together). The lower the U worth, the greater a window's resistance to heat circulation and the better its insulating worth.

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 chillier outside compared with indoors, the heat loss through the windows would be: 6. 2 15 70 = 6510W That is comparable to the total heat output of a large space gas heater or a 6.

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If you choose 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 cut in half 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 sunshine streams through an entire window (glass and frame together).

The lower a window's SHGC, the less solar heat it sends to your house interior. Glazing manufacturers 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 known as the angle of incidence.

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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 stated by glazing producers is constantly computed as having a 0 angle of occurrence. As the angle increases, more solar radiation is shown, and less is transmitted.