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That window can transfer more solar heat in winter season than in summer season. A west-facing window on a summer season's afternoon has an angle of incidence from near 0 as much as 30 with a large reliable location 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 transmit less heat than a west-facing one.

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You can rapidly and quickly enhance the thermal performance of your home by changing your windows. This is one of the most efficient methods of renovation to achieve improved thermal comfort. There are thousands of kinds of glass and frames to select from. Choosing the best ones is important to enhancing the energy performance of your home.

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Single glazing with clear glass is not very effective when it comes to heat loss or gain. To enhance performance, you can use single glazing with a more energy-efficient type of glass such as low emissivity (low-e) glass.

Numerous layers can be put together with sealed cavities between each sheet of glass. IGUs generally use better energy efficiency than single glazing, because they transmit less energy. The energy efficiency of IGUs also depends on: the properties 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. Cavity density is typically 6 to 18mm. Broader cavities supply lower (much better) U values, with 12mm generally accepted as the preferred gap how well the cavity is sealed. Cavities must be dry and well sealed to prevent moisture getting in.

If argon is set up to the cavity in location of air, wetness is dependably left out the level of desiccant (drying representative). The spacer (metal or polymer strip) that separates the glass layers consists of a desiccant to take in any wetness. Insufficient desiccant may trigger wetness to condense on the glass surface in cold conditions, reducing thermal efficiency.

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In fact, IGUs can deliver better energy efficiency for all climates, particularly in heated and air-conditioned homes. Cross-section detail of single, double and triple-glazing systems Low emissivity glass (typically referred to as low-e glass) reduces heat transfer. Low-e glass may be either high or low transmission: High transmission low-e glass has a finishing that permits daytime from the sun to pass into your home to achieve good solar heat gain, but reduces the amount of the long wavelength infrared heat that can leave back through the window.

Low-e glass has either a pyrolytic coating or a vacuum-deposited thin movie metal finish. Pyrolytic finishings are resilient and can be utilized for any glazing; vacuum-deposited finishes are soft and are just utilized within IGUs. Low-e finishes can considerably enhance both U worth and SHGC; however, they need to be used correctly or they will either deteriorate or fail to carry out as required.

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