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

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You can quickly and easily enhance the thermal efficiency of your home by changing your windows. There are thousands of types of glass and frames to select from.

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

The energy performance of IGUs also depends on: the homes of each layer of glass. Different 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 density is normally 6 to 18mm. Larger cavities offer lower (much better) U worths, with 12mm usually accepted as the preferred space how well the cavity is sealed. Cavities should be dry and well sealed to avoid wetness getting in.

If argon is installed 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 moisture. Insufficient desiccant might cause wetness to condense on the glass surface in cold conditions, reducing thermal efficiency.

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In reality, IGUs can provide better energy performance for all climates, specifically in heated and air-conditioned homes. Cross-section detail of single, double and triple-glazing systems Low emissivity glass (commonly understood as low-e glass) decreases heat transfer. Low-e glass might be either high or low transmission: High transmission low-e glass has a finishing that allows daytime from the sun to pass into your house to achieve good solar heat gain, however decreases 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 film metal covering. Pyrolytic finishes are resilient and can be used for any glazing; vacuum-deposited coverings are soft and are just utilized within IGUs. Low-e finishes can considerably enhance both U worth and SHGC; however, they need to be utilized correctly or they will either weaken or stop working to carry out as needed.

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Low-e coatings can be used in combination with clear, toned or reflective glass. Low-e coatings on glazing can reduce heat transfer where needed Photo: Department of Industry, Science, Energy and Resources Toned glass has colouring additives included during manufacture. It is readily available in different colours, usually bronze, grey, blue and green.