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Glazing merely means the windows in your house, including both openable and fixed windows, as well as doors with glass and skylights. Glazing actually just implies the glass part, but it is generally utilized to describe all elements of an assembly consisting of glass, movies, frames and furnishings. Taking note of all of these aspects will help you to accomplish reliable passive design.

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Energy-efficient glazing makes your house more comfy and drastically reduces your energy costs. Improper or inadequately created glazing can be a major source of unwanted heat gain in summer and substantial heat loss and condensation in winter season. Approximately 87% of a home's heating energy can be gotten and as much as 40% lost through windows.

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Glazing is a considerable financial investment in the quality of your house. The expense of glazing and the expense of heating and cooling your house are carefully related. An initial financial investment in energy-efficient windows, skylights and doors can significantly decrease your annual heating & cooling bill. Energy-efficient glazing also lowers the peak heating and cooling load, which can minimize the needed size of an air-conditioning system by 30%, causing more cost savings.

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This tool compares window choices to a base level aluminium window with 3mm clear glass. Comprehending a few of the key residential or commercial properties of glass will assist you to pick the best glazing for your house. Secret properties of glass Source: Adapted from the Australian Window Association The quantity of light that travels through the glazing is understood as noticeable light transmittance (VLT) or noticeable transmittance (VT).

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The U value 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 flow and the better its insulating value.

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'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 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 halve 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 streams through an entire window (glass and frame together).

The lower a window's SHGC, the less solar heat it transfers to your home interior. Glazing producers declare an SHGC for each window type and design. However, the real SHGC for windows is impacted 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 manufacturers is constantly computed as having a 0 angle of incidence. As the angle increases, more solar radiation is reflected, and less is sent.