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Glazing merely implies the windows in your house, consisting of both openable and set windows, in addition to doors with glass and skylights. Glazing actually simply means the glass part, but it is typically used to refer to all elements of an assembly including glass, movies, frames and home furnishings. Focusing on all of these elements will assist you to achieve efficient passive style.

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Energy-efficient glazing makes your house more comfy and considerably lowers your energy costs. Nevertheless, inappropriate or improperly designed glazing can be a significant source of unwanted heat gain in summer season and considerable heat loss and condensation in winter season. As much as 87% of a home's heating energy can be gained and approximately 40% lost through windows.

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Glazing is a considerable investment in the quality of your house. An initial investment in energy-efficient windows, skylights and doors can considerably reduce your yearly heating and cooling costs.

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This tool compares window choices to a base level aluminium window with 3mm clear glass. Understanding some of the key properties of glass will help you to select the finest glazing for your house. Key homes of glass Source: Adapted from the Australian Window Association The amount of light that passes through the glazing is called visible light transmittance (VLT) or noticeable transmittance (VT).

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This might lead you to turn on lights, which will result in higher energy costs. Conduction is how easily a material performs heat. This is known as the U value. The U value for windows (expressed as Uw), describes the conduction of the entire 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.

For instance, if your home 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 to indoors, the heat loss through the windows would be: 6. 2 15 70 = 6510W That is equivalent to the overall heat output of a big room gas heating system 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 gap 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) measures how easily heat from direct sunlight flows through a whole window (glass and frame together).

The lower a window's SHGC, the less solar heat it sends to the home interior. Glazing producers state an SHGC for each window type and design. The actual SHGC for windows is affected by the angle that solar radiation strikes the glass. This is called 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 declared by glazing manufacturers is always calculated as having a 0 angle of incidence. As the angle increases, more solar radiation is reflected, and less is sent.