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Glazing just indicates the windows in your home, including both openable and fixed windows, in addition to doors with glass and skylights. Glazing actually just means the glass part, however it is usually used to refer to all elements of an assembly consisting of glass, movies, frames and home furnishings. Taking note of all of these aspects will help you to accomplish reliable passive style.

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Energy-efficient glazing makes your home more comfy and dramatically minimizes your energy costs. Nevertheless, unsuitable or improperly created glazing can be a major source of unwanted heat gain in summer and substantial heat loss and condensation in winter. Approximately 87% of a house's heating energy can be gained and approximately 40% lost through windows.

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Glazing is a considerable financial investment in the quality of your house. A preliminary investment in energy-efficient windows, skylights and doors can considerably decrease your yearly 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 assist you to select the best glazing for your house. Secret residential or commercial properties of glass Source: Adapted from the Australian Window Association The amount of light that travels through the glazing is known as visible light transmittance (VLT) or visible transmittance (VT).

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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 higher a window's resistance to heat circulation and the much better its insulating worth.

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's night when it is 15C cooler outside compared with inside your home, the heat loss through the windows would be: 6. 2 15 70 = 6510W That is comparable to the total heat output of a big room gas heating unit 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 gap 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) determines how readily 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 home interior. Glazing manufacturers 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 occurrence.

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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 makers is constantly calculated as having a 0 angle of occurrence. As the angle increases, more solar radiation is reflected, and less is transmitted.