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Glazing simply means the windows in your house, including both openable and set windows, as well as doors with glass and skylights. Glazing really just suggests the glass part, but it is generally used to refer to all elements of an assembly consisting of glass, films, frames and furnishings. Taking note of all of these elements will assist you to accomplish efficient passive style.

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Energy-efficient glazing makes your house more comfortable and dramatically reduces your energy costs. Nevertheless, improper or inadequately created glazing can be a significant source of undesirable heat gain in summertime and considerable heat loss and condensation in winter season. Up to 87% of a home's heating energy can be acquired and up to 40% lost through windows.

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Glazing is a considerable investment in the quality of your house. An initial financial investment in energy-efficient windows, skylights and doors can greatly decrease your annual heating and cooling expense.

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This tool compares window choices to a base level aluminium window with 3mm clear glass. Understanding a few of the key properties of glass will help you to choose the very best glazing for your home. Secret homes of glass Source: Adjusted from the Australian Window Association The amount of light that goes through the glazing is called noticeable light transmittance (VLT) or visible transmittance (VT).

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

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 inside, the heat loss through the windows would be: 6. 2 15 70 = 6510W That is comparable to the overall heat output of a large 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 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 (expressed as SHGCw) determines 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 transfers to the home interior. Glazing producers declare an SHGC for each window type and design. Nevertheless, the real SHGC for windows is impacted by the angle that solar radiation strikes the glass. This is referred to as the angle of incidence.

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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 stated by glazing manufacturers is always computed as having a 0 angle of occurrence. As the angle increases, more solar radiation is shown, and less is sent.