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Glazing merely means the windows in your house, consisting of both openable and set windows, as well as doors with glass and skylights. Glazing actually just suggests the glass part, however it is typically used to describe all elements of an assembly including glass, films, frames and furnishings. Paying attention to all of these elements will help you to accomplish efficient passive design.

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Energy-efficient glazing makes your house more comfortable and drastically lowers your energy costs. Nevertheless, unsuitable or badly created glazing can be a significant source of unwanted heat gain in summer and substantial heat loss and condensation in winter. Up to 87% of a house's heating energy can be gained and up to 40% lost through windows.

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Glazing is a considerable financial investment in the quality of your home. A preliminary investment in energy-efficient windows, skylights and doors can significantly decrease your yearly heating and cooling bill.

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This tool compares window selections to a base level aluminium window with 3mm clear glass. Comprehending some of the key properties of glass will assist you to choose the finest glazing for your home. Secret properties of glass Source: Adjusted from the Australian Window Association The quantity 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 switch on lights, which will result in greater energy costs. Conduction is how readily a material performs heat. This is referred to as the U value. The U value for windows (revealed 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 flow and the better its insulating worth.

For example, if your house has 70m2 of glazing with aluminium frames and clear glass with a U worth of 6. 2W/m2 C, on a winter season's night when it is 15C colder 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 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 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) 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 transmits to your home interior. Glazing makers declare an SHGC for each window type and style. However, the actual SHGC for windows is affected by the angle that solar radiation strikes the glass. This is understood as the angle of occurrence.

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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 maximum possible solar heat gain. The SHGC declared by glazing producers is constantly computed as having a 0 angle of occurrence. As the angle increases, more solar radiation is shown, and less is transmitted.