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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 occurrence from near 0 up to 30 with a large efficient area of solar radiation. A north-facing window, in summer season, has a high angle of incidence and a low reliable area of solar radiation, so can send less heat than a west-facing one.

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You can quickly and quickly enhance the thermal efficiency 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 very effective when it comes to heat loss or gain. To improve 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 put together with sealed cavities between each sheet of glass. IGUs generally offer much better energy efficiency than single glazing, due to the fact that they transfer less energy. Nevertheless, the energy efficiency of IGUs also depends on: the residential or commercial properties of each layer of glass. Various glass types (for instance, 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 generally 6 to 18mm. Broader cavities supply lower (much better) U values, with 12mm normally accepted as the favored 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, moisture is reliably omitted the level of desiccant (drying agent). The spacer (metal or polymer strip) that separates the glass layers includes a desiccant to soak up any wetness. Insufficient desiccant might cause moisture to condense on the glass surface area in cold conditions, reducing thermal performance.

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In truth, IGUs can provide much better energy performance for all climates, especially in heated and air-conditioned houses. Cross-section detail of single, double and triple-glazing systems Low emissivity glass (commonly called low-e glass) minimizes 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 excellent solar heat gain, however minimizes the amount 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 finishes are resilient and can be utilized for any glazing; vacuum-deposited finishes are soft and are just used within IGUs. Low-e finishes can substantially improve both U value and SHGC; however, they need to be utilized properly or they will either degrade or stop working to perform as needed.

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Low-e coatings can be utilized in combination with clear, toned or reflective glass. Low-e finishings on glazing can reduce heat transfer where needed Photo: Department of Market, Science, Energy and Resources Toned glass has actually colouring ingredients included during manufacture. It is offered in numerous colours, generally bronze, grey, blue and green.