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That window can transmit more solar heat in winter season than in summertime. A west-facing window on a summer season's afternoon has an angle of incidence from near 0 approximately 30 with a large reliable location of solar radiation. A north-facing window, in summer, 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 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 extremely effective when it comes to heat loss or gain. To improve performance, you can utilize single glazing with a more energy-efficient type of glass such as low emissivity (low-e) glass.

Multiple layers can be assembled with sealed cavities between each sheet of glass. IGUs typically use better energy efficiency than single glazing, because they transmit less energy. Nevertheless, 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 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. Cavity thickness is typically 6 to 18mm. Broader cavities supply lower (better) U worths, with 12mm usually accepted as the favored space 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 location of air, moisture is reliably omitted the level of desiccant (drying agent). The spacer (metal or polymer strip) that separates the glass layers consists of a desiccant to absorb any wetness. Insufficient desiccant may trigger moisture to condense on the glass surface in cold conditions, decreasing thermal efficiency.

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IGUs can deliver better energy performance for all environments, especially in heated and air-conditioned houses. Cross-section information of single, double and triple-glazing systems Low emissivity glass (typically called low-e glass) minimizes heat transfer. Low-e glass may be either high or low transmission: High transmission low-e glass has a finish that allows daytime from the sun to enter the house to attain great solar heat gain, however decreases the amount of the long wavelength infrared heat that can leave back through the window.

Low-e glass has either a pyrolytic finish or a vacuum-deposited thin film metal finish. Pyrolytic coatings are durable and can be used for any glazing; vacuum-deposited coatings are soft and are just utilized within IGUs. Low-e coverings can considerably improve both U value and SHGC; however, they should be used properly or they will either deteriorate or fail 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 Image: Department of Industry, Science, Energy and Resources Toned glass has actually colouring additives included throughout manufacture. It is offered in different colours, generally bronze, grey, blue and green.