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That window can transfer more solar heat in winter than in summer. A west-facing window on a summer's afternoon has an angle of incidence from near 0 approximately 30 with a big effective area of solar radiation. A north-facing window, in summer, has a high angle of incidence and a low efficient location of solar radiation, so can transfer less heat than a west-facing one.

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You can quickly and quickly improve the thermal efficiency of your house by changing your windows. There are thousands of types of glass and frames to choose from.

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There are several types of glass products to select from. Single glazing uses a single pane of glass. Single glazing with clear glass is not very efficient when it pertains to heat loss or gain. To enhance performance, you can use single glazing with a more energy-efficient kind of glass such as low emissivity (low-e) glass.

The energy efficiency of IGUs also depends on: the residential or commercial properties of each layer of glass. Different 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 thickness is usually 6 to 18mm. Wider cavities provide lower (much better) U values, with 12mm normally accepted as the preferred space how well the cavity is sealed. Cavities need to be dry and well sealed to avoid moisture getting in.

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

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In fact, IGUs can provide better energy efficiency for all climates, particularly in heated and air-conditioned homes. Cross-section information of single, double and triple-glazing systems Low emissivity glass (commonly called low-e glass) lowers heat transfer. Low-e glass might be either high or low transmission: High transmission low-e glass has a covering that enables daylight from the sun to pass into your home to accomplish good solar heat gain, but lowers the quantity 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 coverings are long lasting and can be utilized for any glazing; vacuum-deposited finishings are soft and are only used within IGUs. Low-e coatings can significantly enhance both U value and SHGC; however, they need to be used correctly or they will either degrade or stop working to perform as required.

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Low-e coatings can be used in mix with clear, toned or reflective glass. Low-e coatings on glazing can decrease heat transfer where required Image: Department of Industry, Science, Energy and Resources Toned glass has colouring ingredients included during manufacture. It is available in numerous colours, generally bronze, grey, blue and green.