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Glazing just implies the windows in your home, including both openable and fixed windows, as well as doors with glass and skylights. Glazing actually simply means the glass part, however it is usually used to describe all aspects of an assembly including glass, films, frames and home furnishings. Taking note of all of these elements will help you to accomplish efficient passive design.

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Energy-efficient glazing makes your home more comfy and drastically decreases your energy costs. Improper or badly designed glazing can be a significant source of unwanted heat gain in summertime and substantial heat loss and condensation in winter. Up to 87% of a house's heating energy can be gained and as much as 40% lost through windows.

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Glazing is a significant investment in the quality of your house. A preliminary investment in energy-efficient windows, skylights and doors can significantly reduce your annual heating and cooling costs.

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This tool compares window selections to a base level aluminium window with 3mm clear glass. Comprehending a few of the key properties of glass will help you to pick the very best glazing for your house. Secret properties of glass Source: Adapted 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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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 higher a window's resistance to heat circulation and the much better its insulating worth.

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 season'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 big space gas heating system or a 6.

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If you pick a window with half the U worth (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 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 sends to your house interior. Glazing makers declare an SHGC for each window type and design. The actual SHGC for windows is impacted by the angle that solar radiation strikes the glass. This is referred to 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 optimum possible solar heat gain. The SHGC declared by glazing producers is constantly calculated as having a 0 angle of occurrence. As the angle increases, more solar radiation is reflected, and less is transmitted.