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That window can transfer more solar heat in winter season than in summer. A west-facing window on a summertime's afternoon has an angle of incidence from near 0 approximately 30 with a large effective 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 improve the thermal efficiency of your house 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 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.

Several layers can be assembled with sealed cavities in between each sheet of glass. IGUs usually use better energy performance than single glazing, because they send less energy. However, the energy performance of IGUs likewise depends upon: the properties of each layer of glass. Various glass types (for example, clear and low-e glass) can be created 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. Wider cavities supply lower (better) U values, with 12mm normally accepted as the preferred space how well the cavity is sealed.

If argon is set up to the cavity in place of air, moisture is reliably excluded the level of desiccant (drying representative). The spacer (metal or polymer strip) that separates the glass layers contains a desiccant to absorb any moisture. Inadequate desiccant might 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 environments, particularly in heated and air-conditioned houses. Cross-section detail of single, double and triple-glazing units Low emissivity glass (frequently called low-e glass) reduces heat transfer. Low-e glass might be either high or low transmission: High transmission low-e glass has a coating that allows daytime from the sun to pass into your house to attain 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 coating or a vacuum-deposited thin movie metal covering. Pyrolytic finishings are long lasting and can be utilized for any glazing; vacuum-deposited coatings are soft and are only used within IGUs. Low-e coverings can substantially improve both U value and SHGC; nevertheless, they need to be used properly or they will either weaken or stop working to perform as required.

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Low-e coverings can be utilized in combination with clear, toned or reflective glass. Low-e coverings on glazing can reduce heat transfer where needed Image: Department of Industry, Science, Energy and Resources Toned glass has colouring ingredients included during manufacture. It is readily available in various colours, typically bronze, grey, blue and green.