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

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You can rapidly and easily enhance the thermal performance of your home by replacing your windows. There are thousands of types of glass and frames to choose from.

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

The energy efficiency of IGUs likewise 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 generally 6 to 18mm. Larger cavities offer lower (better) U values, with 12mm normally accepted as the favored gap how well the cavity is sealed. Cavities should be dry and well sealed to prevent moisture getting in.

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

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IGUs can deliver much better energy performance for all environments, especially in heated and air-conditioned houses. Cross-section detail of single, double and triple-glazing units Low emissivity glass (typically referred to as low-e glass) reduces heat transfer. Low-e glass may be either high or low transmission: High transmission low-e glass has a covering that enables daytime from the sun to pass into your house to accomplish excellent solar heat gain, but lowers the amount of the long wavelength infrared heat that can escape back through the window.

Low-e glass has either a pyrolytic covering or a vacuum-deposited thin film metal finish. Pyrolytic coatings are resilient and can be utilized for any glazing; vacuum-deposited finishes are soft and are only used within IGUs. Low-e coverings can significantly improve both U value and SHGC; nevertheless, they should be utilized correctly or they will either weaken or fail to carry out as needed.

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Low-e coatings can be utilized in mix with clear, toned or reflective glass. Low-e finishes on glazing can lower heat transfer where required Photo: Department of Industry, Science, Energy and Resources Toned glass has colouring additives included during manufacture. It is offered in numerous colours, generally bronze, grey, blue and green.