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

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You can rapidly and quickly enhance the thermal efficiency of your home by replacing 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 efficient 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.

The energy performance of IGUs also depends on: the 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 normally 6 to 18mm. Wider cavities supply lower (much better) U values, with 12mm normally accepted as the preferred gap how well the cavity is sealed. Cavities need to be dry and well sealed to prevent wetness getting in.

If argon is installed to the cavity in location of air, wetness is dependably excluded the level of desiccant (drying agent). The spacer (metal or polymer strip) that separates the glass layers contains a desiccant to absorb any moisture. Insufficient desiccant may trigger moisture to condense on the glass surface area in cold conditions, minimizing thermal efficiency.

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In reality, IGUs can provide much better energy performance for all climates, especially in heated and air-conditioned homes. Cross-section information of single, double and triple-glazing systems 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 finish that allows daylight from the sun to enter the home to achieve good solar heat gain, however reduces the quantity 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 finish. Pyrolytic finishings are long lasting and can be used for any glazing; vacuum-deposited finishes are soft and are just used within IGUs. Low-e finishings can substantially improve both U value and SHGC; nevertheless, they need to be utilized properly or they will either degrade or stop working to carry out as required.

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Low-e finishings can be utilized in combination with clear, toned or reflective glass. Low-e finishes on glazing can minimize heat transfer where required Image: Department of Market, Science, Energy and Resources Toned glass has actually colouring additives included during manufacture. It is available in different colours, typically bronze, grey, blue and green.