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That window can transfer more solar heat in winter than in summertime. A west-facing window on a summer's afternoon has an angle of incidence from near 0 as much as 30 with a large effective location of solar radiation. A north-facing window, in summertime, has a high angle of occurrence and a low efficient 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 efficiency of your home by replacing your windows. This is one of the most efficient methods of restoration to achieve improved thermal convenience. There are countless types of glass and frames to pick from. Choosing the best ones is crucial to improving the energy performance of your home.

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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 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 typically offer much better energy performance than single glazing, since they transfer less energy. The energy efficiency of IGUs also depends on: the residential or commercial properties of each layer of glass. Different glass types (for instance, 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 normally 6 to 18mm. Larger cavities offer lower (better) U worths, with 12mm normally accepted as the favored space how well the cavity is sealed. Cavities must be dry and well sealed to prevent moisture getting in.

If argon is installed to the cavity in location of air, wetness is reliably omitted the level of desiccant (drying agent). The spacer (metal or polymer strip) that separates the glass layers contains a desiccant to take in any moisture. Insufficient desiccant might cause wetness to condense on the glass surface area in cold conditions, reducing thermal performance.

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IGUs can deliver much better energy efficiency for all environments, particularly in heated and air-conditioned homes. Cross-section detail of single, double and triple-glazing systems Low emissivity glass (typically called low-e glass) decreases heat transfer. Low-e glass might be either high or low transmission: High transmission low-e glass has a finishing that enables daytime from the sun to pass into your house to accomplish excellent solar heat gain, however reduces the amount of the long wavelength infrared heat that can escape back through the window.

Low-e glass has either a pyrolytic finish or a vacuum-deposited thin film metal covering. Pyrolytic coverings are long lasting and can be used for any glazing; vacuum-deposited coverings are soft and are just used within IGUs. Low-e coatings can substantially improve both U worth and SHGC; however, they should be utilized correctly or they will either weaken or fail to perform as needed.

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Low-e coverings can be used in mix with clear, toned or reflective glass. Low-e coverings on glazing can decrease heat transfer where required Photo: Department of Market, Science, Energy and Resources Toned glass has colouring additives included throughout manufacture. It is available in various colours, usually bronze, grey, blue and green.