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

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You can quickly and quickly improve the thermal efficiency of your home 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 extremely efficient when it comes to heat loss or gain. To improve efficiency, you can use single glazing with a more energy-efficient type of glass such as low emissivity (low-e) glass.

Multiple layers can be put together with sealed cavities between each sheet of glass. IGUs typically use better energy performance than single glazing, due to the fact that they send less energy. However, the energy performance of IGUs likewise depends on: the homes of each layer of glass. Various glass types (for example, clear and low-e glass) can be assembled 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 typically 6 to 18mm. Wider cavities offer lower (better) U worths, with 12mm normally accepted as the favored space how well the cavity is sealed. Cavities should be dry and well sealed to avoid moisture getting in.

If argon is set up to the cavity in location of air, moisture is reliably excluded the level of desiccant (drying agent). The spacer (metal or polymer strip) that separates the glass layers includes a desiccant to absorb any wetness. Insufficient desiccant might trigger wetness to condense on the glass surface area in cold conditions, lowering thermal performance.

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In reality, IGUs can provide better energy performance for all environments, specifically in heated and air-conditioned houses. Cross-section detail of single, double and triple-glazing units Low emissivity glass (commonly referred to as low-e glass) lowers heat transfer. Low-e glass may be either high or low transmission: High transmission low-e glass has a coating that allows daylight from the sun to enter the home to achieve great solar heat gain, however reduces the amount of the long wavelength infrared heat that can get away back through the window.

Low-e glass has either a pyrolytic finishing or a vacuum-deposited thin film metal finishing. Pyrolytic coatings are durable and can be used for any glazing; vacuum-deposited finishings are soft and are only utilized within IGUs. Low-e finishings can considerably improve both U value and SHGC; however, they should be utilized correctly or they will either weaken or stop working to perform as required.

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Low-e coverings can be used in mix with clear, toned or reflective glass. Low-e coverings on glazing can minimize heat transfer where needed Picture: Department of Market, Science, Energy and Resources Toned glass has colouring additives included during manufacture. It is readily available in different colours, typically bronze, grey, blue and green.