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Glazing simply implies the windows in your house, including both openable and fixed windows, along with doors with glass and skylights. Glazing actually simply implies the glass part, however it is normally used to describe all elements of an assembly including glass, films, frames and furnishings. Focusing on all of these elements will assist you to accomplish effective passive style.



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Energy-efficient glazing makes your house more comfortable and drastically minimizes your energy costs. Unsuitable or poorly developed glazing can be a major source of undesirable heat gain in summer and significant heat loss and condensation in winter season. Approximately 87% of a home's heating energy can be gained and as much as 40% lost through windows.

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Glazing is a substantial financial investment in the quality of your home. An initial 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 selections to a base level aluminium window with 3mm clear glass. Understanding a few of the key properties of glass will assist you to pick the very best glazing for your home. Secret homes of glass Source: Adjusted from the Australian Window Association The quantity of light that goes 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 result in higher energy expenses. Conduction is how easily a product carries out heat. This is referred to as the U worth. The U worth for windows (revealed as Uw), explains the conduction of the whole window (glass and frame together). The lower the U value, the greater a window's resistance to heat circulation and the better its insulating worth.

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's night when it is 15C cooler outside compared to inside, 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 heater 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 cut in half the heat loss: 3. 1 15 70 = 3255W The solar heat gain coefficient (SHGC) for windows (revealed as SHGCw) measures how readily heat from direct sunshine streams through a whole window (glass and frame together).

The lower a window's SHGC, the less solar heat it transfers 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 declared by glazing makers is constantly computed as having a 0 angle of occurrence. As the angle increases, more solar radiation is reflected, and less is transmitted.