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Glazing just suggests the windows in your house, including both openable and fixed windows, as well as doors with glass and skylights. Glazing really just means the glass part, but it is generally used to describe all elements of an assembly including glass, movies, frames and home furnishings. Taking note of all of these elements will assist you to achieve reliable passive design.

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Energy-efficient glazing makes your home more comfortable and significantly reduces your energy expenses. Nevertheless, unsuitable or poorly developed glazing can be a significant source of undesirable heat gain in summertime and significant heat loss and condensation in winter. As much as 87% of a house's heating energy can be acquired and as much as 40% lost through windows.

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Glazing is a considerable investment in the quality of your house. The cost of glazing and the cost of heating and cooling your home are closely associated. An initial financial investment in energy-efficient windows, skylights and doors can significantly lower your annual heating and cooling bill. Energy-efficient glazing also decreases the peak heating and cooling load, which can decrease the required size of an air-conditioning system by 30%, leading to more cost savings.

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This tool compares window choices to a base level aluminium window with 3mm clear glass. Comprehending some of the key residential or commercial properties of glass will help you to select the best glazing for your house. Key residential or commercial properties of glass Source: Adjusted from the Australian Window Association The quantity of light that passes through the glazing is known as noticeable light transmittance (VLT) or visible transmittance (VT).

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The U value for windows (expressed 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 flow and the better its insulating value.

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 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 total heat output of a large space gas heater or a 6.

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If you select a window with half the U value (3. 1W/m2 C) (for instance, double glazing with an argon-filled gap 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 sunshine streams through a whole window (glass and frame together).

The lower a window's SHGC, the less solar heat it transfers to your house interior. Glazing manufacturers declare an SHGC for each window type and design. Nevertheless, the real 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 optimum possible solar heat gain. The SHGC stated by glazing manufacturers is constantly determined as having a 0 angle of incidence. As the angle increases, more solar radiation is reflected, and less is transmitted.