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

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

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There are various kinds of glass products to pick from. Single glazing utilizes a single pane of glass. Single glazing with clear glass is not very effective when it concerns 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.

Multiple layers can be assembled with sealed cavities in between each sheet of glass. IGUs usually offer better energy efficiency than single glazing, because they transmit less energy. However, the energy performance of IGUs likewise depends on: the homes of each layer of glass. Various glass types (for instance, 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. Larger cavities offer lower (better) U values, with 12mm normally accepted as the preferred space how well the cavity is sealed.

If argon is installed to the cavity in place of air, wetness is reliably left out the level of desiccant (drying representative). The spacer (metal or polymer strip) that separates the glass layers includes a desiccant to take in any moisture. Inadequate desiccant might cause wetness to condense on the glass surface in cold conditions, decreasing thermal performance.

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In fact, IGUs can deliver better energy efficiency for all environments, specifically in heated and air-conditioned homes. Cross-section information of single, double and triple-glazing systems Low emissivity glass (commonly referred to as low-e glass) decreases heat transfer. Low-e glass might be either high or low transmission: High transmission low-e glass has a finish that allows daytime from the sun to pass into the house to attain excellent solar heat gain, however decreases the amount of the long wavelength infrared heat that can get away back through the window.

Low-e glass has either a pyrolytic finish 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 just used within IGUs. Low-e finishings can considerably improve both U worth and SHGC; nevertheless, they need to be utilized correctly or they will either deteriorate or stop working to perform as required.

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