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Glazing simply implies the windows in your home, including both openable and set windows, as well as doors with glass and skylights. Glazing really simply suggests the glass part, however it is usually used to describe all aspects of an assembly consisting of glass, films, frames and furnishings. Taking notice of all of these elements will help you to accomplish reliable passive design.

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Energy-efficient glazing makes your home more comfy and significantly decreases your energy costs. Improper or badly created glazing can be a major source of unwanted heat gain in summer and considerable heat loss and condensation in winter. As much as 87% of a house's heating energy can be gotten and up to 40% lost through windows.

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

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This tool compares window choices to a base level aluminium window with 3mm clear glass. Understanding a few of the crucial properties of glass will assist you to pick the best glazing for your house. Key residential or commercial properties of glass Source: Adjusted from the Australian Window Association The amount of light that passes through the glazing is called noticeable light transmittance (VLT) or noticeable transmittance (VT).

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

For example, if your home 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 cooler 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 pick 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 (revealed as SHGCw) measures how easily heat from direct sunlight streams through a whole window (glass and frame together).

The lower a window's SHGC, the less solar heat it transmits to the house interior. The actual SHGC for windows is affected by the angle that solar radiation strikes the glass.

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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 optimum possible solar heat gain. The SHGC stated by glazing manufacturers is constantly computed as having a 0 angle of occurrence. As the angle increases, more solar radiation is shown, and less is sent.