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Glazing simply suggests the windows in your house, including both openable and fixed windows, in addition to doors with glass and skylights. Glazing in fact just means the glass part, but it is usually utilized to refer to all aspects of an assembly including glass, movies, frames and home furnishings. Focusing on all of these aspects will help you to achieve reliable passive design.
Energy-efficient glazing makes your house more comfortable and dramatically decreases your energy costs. Inappropriate or improperly designed glazing can be a major source of undesirable heat gain in summer and significant heat loss and condensation in winter season. Up to 87% of a home's heating energy can be gained and approximately 40% lost through windows.
Glazing is a considerable financial investment in the quality of your home. An initial investment in energy-efficient windows, skylights and doors can greatly minimize your annual heating and cooling bill.
This tool compares window choices to a base level aluminium window with 3mm clear glass. Comprehending some of the crucial homes of glass will assist you to pick the best glazing for your home. Secret residential or commercial properties of glass Source: Adjusted from the Australian Window Association The quantity of light that goes through the glazing is referred to as visible light transmittance (VLT) or noticeable transmittance (VT).
The U worth for windows (expressed 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 flow 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'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 big room gas heating unit or a 6.
If you choose 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 cut in half the heat loss: 3. 1 15 70 = 3255W The solar heat gain coefficient (SHGC) for windows (expressed as SHGCw) measures 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 transmits to your home interior. Glazing manufacturers state an SHGC for each window type and design. The actual SHGC for windows is affected by the angle that solar radiation strikes the glass. This is called the angle of occurrence.
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 stated by glazing makers is always determined as having a 0 angle of occurrence. As the angle increases, more solar radiation is reflected, and less is transferred.
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