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That window can transfer more solar heat in winter season than in summer season. A west-facing window on a summer's afternoon has an angle of incidence from near 0 approximately 30 with a large reliable area of solar radiation. A north-facing window, in summertime, has a high angle of occurrence and a low effective location of solar radiation, so can transfer less heat than a west-facing one.

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You can quickly and easily improve the thermal efficiency of your home by changing your windows. This is one of the most efficient approaches of renovation to accomplish improved thermal convenience. There are thousands of types of glass and frames to pick from. Selecting the ideal ones is very important to enhancing the energy efficiency of your home.

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Single glazing with clear glass is not very effective when it comes to heat loss or gain. To enhance performance, you can use single glazing with a more energy-efficient type of glass such as low emissivity (low-e) glass.

The energy efficiency of IGUs also depends on: the residential or commercial properties of each layer of glass. Various glass types (for example, clear and low-e glass) can be put together in an IGU.

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IGU cavities can be filled with air or a more inert, low-conductivity gas such as argon the width of the cavity. Cavity thickness is normally 6 to 18mm. Wider cavities supply lower (better) U worths, with 12mm generally accepted as the preferred space how well the cavity is sealed. Cavities should be dry and well sealed to prevent wetness getting in.

If argon is set up to the cavity in place of air, moisture is dependably omitted the level of desiccant (drying agent). The spacer (metal or polymer strip) that separates the glass layers includes a desiccant to take in any wetness. Insufficient desiccant may trigger wetness to condense on the glass surface area in cold conditions, reducing thermal efficiency.

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IGUs can deliver better energy performance for all environments, specifically in heated and air-conditioned homes. Cross-section detail of single, double and triple-glazing systems Low emissivity glass (commonly known as low-e glass) reduces heat transfer. Low-e glass may be either high or low transmission: High transmission low-e glass has a finish that permits daylight from the sun to pass into the home to achieve great solar heat gain, however reduces the quantity of the long wavelength infrared heat that can get away back through the window.

Low-e glass has either a pyrolytic covering or a vacuum-deposited thin movie metal finish. Pyrolytic coatings are resilient and can be used for any glazing; vacuum-deposited finishes are soft and are just used within IGUs. Low-e coatings can significantly enhance both U worth and SHGC; however, they need to be used properly or they will either degrade or stop working to perform as required.

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Low-e coatings can be used in mix with clear, toned or reflective glass. Low-e finishes on glazing can lower heat transfer where needed Photo: Department of Market, Science, Energy and Resources Toned glass has actually colouring additives included throughout manufacture. It is readily available in numerous colours, usually bronze, grey, blue and green.