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

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You can rapidly and easily improve 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 efficient when it comes to heat loss or gain. To enhance performance, you can utilize single glazing with a more energy-efficient type of glass such as low emissivity (low-e) glass.

The energy performance of IGUs likewise 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 density is generally 6 to 18mm. Wider cavities provide lower (better) U values, with 12mm usually accepted as the favored gap how well the cavity is sealed. Cavities need to be dry and well sealed to avoid wetness getting in.

If argon is installed to the cavity in location of air, moisture is reliably excluded the level of desiccant (drying agent). The spacer (metal or polymer strip) that separates the glass layers includes a desiccant to take in any wetness. Inadequate desiccant may trigger moisture to condense on the glass surface in cold conditions, reducing thermal performance.

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IGUs can deliver much better energy efficiency for all climates, especially in heated and air-conditioned houses. Cross-section detail of single, double and triple-glazing systems Low emissivity glass (commonly referred to as low-e glass) reduces heat transfer. Low-e glass might be either high or low transmission: High transmission low-e glass has a finish that permits daylight from the sun to pass into your home to attain great solar heat gain, but minimizes the quantity of the long wavelength infrared heat that can leave back through the window.

Low-e glass has either a pyrolytic covering or a vacuum-deposited thin movie metal finishing. Pyrolytic coverings are resilient and can be utilized for any glazing; vacuum-deposited finishings are soft and are only utilized within IGUs. Low-e coverings can substantially enhance both U worth and SHGC; nevertheless, they must be utilized properly or they will either degrade or fail to carry out as needed.

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Low-e finishings can be used in mix with clear, toned or reflective glass. Low-e coatings on glazing can reduce heat transfer where needed Image: Department of Industry, Science, Energy and Resources Toned glass has colouring ingredients consisted of during manufacture. It is available in various colours, usually bronze, grey, blue and green.