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Glazing simply implies the windows in your house, including both openable and set windows, as well as doors with glass and skylights. Glazing actually simply suggests the glass part, but it is usually used to describe all aspects of an assembly including glass, films, frames and furnishings. Paying attention to all of these elements will help you to attain efficient passive design.
Energy-efficient glazing makes your house more comfortable and significantly minimizes your energy costs. Improper or poorly designed glazing can be a major source of undesirable heat gain in summer and considerable heat loss and condensation in winter season. Approximately 87% of a house's heating energy can be acquired and approximately 40% lost through windows.
Glazing is a significant financial investment in the quality of your home. A preliminary investment in energy-efficient windows, skylights and doors can considerably lower your annual heating and cooling expense.
This tool compares window selections to a base level aluminium window with 3mm clear glass. Understanding some of the crucial residential or commercial properties of glass will assist you to pick the very 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 visible transmittance (VT).
The U value for windows (expressed as Uw), describes 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 worth.
For example, 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 season's night when it is 15C cooler outside compared to inside your home, the heat loss through the windows would be: 6. 2 15 70 = 6510W That is equivalent to the overall heat output of a big space gas heater or a 6.
If you select a window with half the U worth (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) measures how readily heat from direct sunshine flows through an entire window (glass and frame together).
The lower a window's SHGC, the less solar heat it transmits to your house interior. Glazing manufacturers declare an SHGC for each window type and design. However, the actual SHGC for windows is impacted 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 optimum possible solar heat gain. The SHGC declared by glazing makers is always determined as having a 0 angle of occurrence. As the angle increases, more solar radiation is shown, and less is transferred.
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