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

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You can quickly and easily enhance the thermal efficiency of your house 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 very effective when it comes to heat loss or gain. To enhance 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 assembled with sealed cavities between each sheet of glass. IGUs normally provide better energy efficiency than single glazing, because they transmit less energy. Nevertheless, 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 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. Wider cavities offer lower (better) U worths, with 12mm usually accepted as the preferred gap 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, moisture is dependably omitted the level of desiccant (drying agent). The spacer (metal or polymer strip) that separates the glass layers contains a desiccant to absorb any moisture. Inadequate desiccant may trigger wetness to condense on the glass surface in cold conditions, reducing thermal performance.

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IGUs can deliver much better energy performance for all environments, particularly in heated and air-conditioned homes. Cross-section information of single, double and triple-glazing systems Low emissivity glass (frequently called low-e glass) decreases heat transfer. Low-e glass may be either high or low transmission: High transmission low-e glass has a coating that enables daylight from the sun to pass into the house to achieve great solar heat gain, however reduces the quantity of the long wavelength infrared heat that can get away back through the window.

Low-e glass has either a pyrolytic coating or a vacuum-deposited thin movie metal finish. Pyrolytic coatings are resilient and can be used for any glazing; vacuum-deposited coverings are soft and are just used within IGUs. Low-e finishes can significantly enhance both U worth and SHGC; however, they should be used properly or they will either degrade or stop working to carry out as needed.

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Low-e finishes can be used in combination with clear, toned or reflective glass. Low-e coverings on glazing can decrease heat transfer where needed Photo: Department of Market, Science, Energy and Resources Toned glass has actually colouring additives consisted of during manufacture. It is offered in numerous colours, generally bronze, grey, blue and green.