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Glazing simply indicates the windows in your home, consisting of both openable and fixed windows, as well as doors with glass and skylights. Glazing really simply suggests the glass part, but it is usually used to describe all aspects of an assembly consisting of glass, movies, frames and home furnishings. Taking note of all of these aspects will help you to achieve efficient passive design.
Energy-efficient glazing makes your home more comfortable and considerably minimizes your energy expenses. However, unsuitable or poorly created glazing can be a significant source of undesirable heat gain in summertime and considerable heat loss and condensation in winter season. As much as 87% of a home's heating energy can be gotten and approximately 40% lost through windows.
Glazing is a considerable financial investment in the quality of your house. A preliminary financial investment in energy-efficient windows, skylights and doors can greatly reduce your annual heating and cooling costs.
This tool compares window choices to a base level aluminium window with 3mm clear glass. Understanding a few of the essential residential or commercial properties of glass will assist you to choose the best glazing for your house. Secret residential or commercial properties of glass Source: Adapted from the Australian Window Association The quantity of light that goes through the glazing is called visible light transmittance (VLT) or noticeable 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 greater a window's resistance to heat circulation and the better its insulating value.
For instance, if your home 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, the heat loss through the windows would be: 6. 2 15 70 = 6510W That is comparable to the total heat output of a big space gas heating system or a 6.
If you select 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 (revealed as SHGCw) measures how readily 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 the house interior. Glazing producers state 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 referred to 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 optimum possible solar heat gain. The SHGC stated by glazing manufacturers is always computed as having a 0 angle of occurrence. As the angle increases, more solar radiation is shown, and less is transmitted.
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