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

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You can quickly 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 really efficient 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 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. Wider cavities offer lower (better) U worths, with 12mm normally accepted as the favored space how well the cavity is sealed.

If argon is installed to the cavity in place of air, wetness is reliably left out the level of desiccant (drying representative). The spacer (metal or polymer strip) that separates the glass layers includes a desiccant to absorb any moisture. Insufficient desiccant may cause moisture to condense on the glass surface area in cold conditions, reducing thermal performance.

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In fact, IGUs can provide much better energy efficiency for all environments, specifically in heated and air-conditioned houses. Cross-section detail of single, double and triple-glazing systems Low emissivity glass (commonly called low-e glass) reduces heat transfer. Low-e glass may be either high or low transmission: High transmission low-e glass has a finishing that allows daytime from the sun to enter the home to achieve great solar heat gain, but minimizes the quantity 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 movie metal finish. Pyrolytic finishes are long lasting and can be used for any glazing; vacuum-deposited finishings are soft and are only utilized within IGUs. Low-e finishes can substantially enhance both U value and SHGC; nevertheless, they should be used correctly 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 minimize heat transfer where needed Image: Department of Market, Science, Energy and Resources Toned glass has colouring additives included during manufacture. It is available in various colours, usually bronze, grey, blue and green.