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Glazing merely suggests the windows in your house, including both openable and fixed windows, along with doors with glass and skylights. Glazing in fact just indicates the glass part, but it is typically used to refer to all elements of an assembly consisting of glass, movies, frames and home furnishings. Paying attention to all of these aspects will help you to accomplish reliable passive style.
Energy-efficient glazing makes your home more comfortable and significantly minimizes your energy costs. Improper or inadequately designed glazing can be a major source of undesirable heat gain in summertime 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.
Glazing is a considerable investment in the quality of your home. The expense of glazing and the cost of heating and cooling your home are closely associated. A preliminary investment in energy-efficient windows, skylights and doors can significantly reduce your yearly heating and cooling bill. Energy-efficient glazing also reduces the peak heating and cooling load, which can lower the needed size of an air-conditioning system by 30%, leading to further cost savings.
This tool compares window selections to a base level aluminium window with 3mm clear glass. Understanding some of the essential homes of glass will help you to select the very best glazing for your house. Secret properties of glass Source: Adapted from the Australian Window Association The amount of light that goes through the glazing is called noticeable light transmittance (VLT) or noticeable transmittance (VT).
The U value for windows (revealed as Uw), explains the conduction of the whole window (glass and frame together). The lower the U worth, the greater a window's resistance to heat circulation and the much 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 cooler outside compared with inside your home, the heat loss through the windows would be: 6. 2 15 70 = 6510W That is comparable to the total heat output of a large room gas heater or a 6.
If you select a window with half the U worth (3. 1W/m2 C) (for instance, 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 (expressed as SHGCw) measures how readily heat from direct sunlight 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. Glazing producers declare an SHGC for each window type and style. The real SHGC for windows is affected by the angle that solar radiation strikes the glass. This is known as the angle of incidence.
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 manufacturers is always computed as having a 0 angle of occurrence. As the angle increases, more solar radiation is reflected, and less is transmitted.
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