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That window can transfer more solar heat in winter season than in summer season. A west-facing window on a summertime's afternoon has an angle of incidence from near 0 up to 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 area of solar radiation, so can send 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 pick from.

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Single glazing with clear glass is not really efficient 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.

The energy efficiency 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. Cavity density is normally 6 to 18mm. Broader cavities offer lower (much better) U values, with 12mm generally accepted as the favored space how well the cavity is sealed. Cavities must be dry and well sealed to prevent wetness getting in.

If argon is installed to the cavity in location of air, wetness is reliably excluded the level of desiccant (drying representative). The spacer (metal or polymer strip) that separates the glass layers consists of a desiccant to take in any moisture. Insufficient desiccant may trigger moisture to condense on the glass surface area in cold conditions, decreasing thermal performance.

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In fact, IGUs can deliver much better energy efficiency for all climates, specifically in heated and air-conditioned homes. Cross-section detail of single, double and triple-glazing units Low emissivity glass (typically 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 covering that enables daylight from the sun to pass into the house to achieve excellent solar heat gain, however minimizes the amount of the long wavelength infrared heat that can escape back through the window.

Low-e glass has either a pyrolytic finishing or a vacuum-deposited thin film metal finishing. Pyrolytic finishings are durable and can be used for any glazing; vacuum-deposited coatings are soft and are only utilized within IGUs. Low-e coatings can significantly improve both U value and SHGC; however, they should be utilized properly or they will either degrade or fail to carry out as needed.

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Low-e coatings can be used in mix with clear, toned or reflective glass. Low-e finishes on glazing can decrease heat transfer where required Photo: Department of Industry, Science, Energy and Resources Toned glass has colouring ingredients consisted of throughout manufacture. It is readily available in different colours, usually bronze, grey, blue and green.