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

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

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Single glazing with clear glass is not really effective when it comes to heat loss or gain. To improve performance, you can use 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 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 usually 6 to 18mm. Wider cavities provide lower (much better) U values, with 12mm usually accepted as the favored space how well the cavity is sealed. Cavities must be dry and well sealed to avoid moisture getting in.

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

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In fact, IGUs can provide much better energy performance for all climates, particularly in heated and air-conditioned homes. Cross-section information of single, double and triple-glazing systems Low emissivity glass (typically called low-e glass) reduces heat transfer. Low-e glass may be either high or low transmission: High transmission low-e glass has a coating that enables daytime from the sun to enter the home to accomplish excellent solar heat gain, but lowers the amount 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 coating. Pyrolytic finishes are durable and can be used for any glazing; vacuum-deposited coverings are soft and are just used within IGUs. Low-e finishings can considerably improve both U value and SHGC; however, they must be used properly or they will either degrade or stop working to perform as required.

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Low-e coverings can be utilized in mix with clear, toned or reflective glass. Low-e coatings on glazing can reduce heat transfer where needed Photo: Department of Market, Science, Energy and Resources Toned glass has colouring additives consisted of throughout manufacture. It is available in different colours, normally bronze, grey, blue and green.