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That window can transfer more solar heat in winter than in summer season. A west-facing window on a summer's afternoon has an angle of occurrence from near 0 as much as 30 with a large efficient area of solar radiation. A north-facing window, in summertime, has a high angle of occurrence 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 house by changing your windows. There are thousands of types of glass and frames to pick from.

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There are several kinds of glass products to choose from. Single glazing uses 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 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 usually use better energy performance than single glazing, because they transfer less energy. Nevertheless, the energy efficiency of IGUs likewise depends upon: the properties of each layer of glass. Various glass types (for example, clear and low-e glass) can be assembled 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 normally 6 to 18mm. Wider cavities provide lower (much better) U worths, with 12mm generally accepted as the favored space how well the cavity is sealed. Cavities should be dry and well sealed to prevent wetness getting in.

If argon is set up to the cavity in place of air, moisture is reliably omitted the level of desiccant (drying representative). The spacer (metal or polymer strip) that separates the glass layers contains a desiccant to absorb any moisture. Inadequate desiccant might cause moisture to condense on the glass surface in cold conditions, lowering thermal efficiency.

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In reality, IGUs can deliver much better energy performance for all climates, particularly 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 coating that enables daylight from the sun to enter your house to attain great solar heat gain, but reduces 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 movie metal covering. Pyrolytic coatings are durable and can be used for any glazing; vacuum-deposited finishes are soft and are only used within IGUs. Low-e finishings can significantly improve both U worth and SHGC; however, they must be used properly or they will either weaken or fail to perform as required.

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Low-e coverings can be used in combination with clear, toned or reflective glass. Low-e coatings on glazing can minimize heat transfer where needed Picture: Department of Market, Science, Energy and Resources Toned glass has colouring ingredients consisted of during manufacture. It is available in numerous colours, usually bronze, grey, blue and green.