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Glazing simply means the windows in your home, consisting of both openable and fixed windows, as well as doors with glass and skylights. Glazing actually just suggests the glass part, however it is typically used to refer to all elements of an assembly including glass, movies, frames and home furnishings. Taking note of all of these aspects will assist you to accomplish efficient passive design.

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Energy-efficient glazing makes your home more comfortable and significantly lowers your energy costs. Unsuitable or badly developed glazing can be a major source of unwanted heat gain in summer and substantial heat loss and condensation in winter season. As much as 87% of a house's heating energy can be acquired and up to 40% lost through windows.

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Glazing is a substantial investment in the quality of your home. The expense of glazing and the cost of heating and cooling your home are closely related. A preliminary investment in energy-efficient windows, skylights and doors can greatly lower your yearly heating and cooling bill. Energy-efficient glazing also reduces the peak heating and cooling load, which can lower the needed size of an air-conditioning system by 30%, resulting in more cost savings.

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This tool compares window selections to a base level aluminium window with 3mm clear glass. Comprehending some of the key residential or commercial properties of glass will help you to select the finest glazing for your home. Key homes of glass Source: Adapted from the Australian Window Association The quantity of light that passes through the glazing is known as visible light transmittance (VLT) or noticeable transmittance (VT).

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This might lead you to turn on lights, which will result in greater energy costs. Conduction is how readily a product conducts heat. This is known as 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 value, the greater 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 worth of 6. 2W/m2 C, on a winter'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 total heat output of a large room gas heating unit or a 6.

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If you select a window with half the U value (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 (expressed 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 transfers 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 understood as 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 declared by glazing manufacturers is always computed as having a 0 angle of occurrence. As the angle increases, more solar radiation is reflected, and less is sent.