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

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However you can rapidly and easily enhance the thermal efficiency of your home by changing your windows. This is one of the most reliable techniques of renovation to attain improved thermal comfort. There are thousands of kinds of glass and frames to pick from. Choosing the right ones is crucial to enhancing the energy performance of your home.

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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 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 provide much better energy performance than single glazing, due to the fact that they transmit less energy. Nevertheless, the energy efficiency of IGUs also depends on: the properties of each layer of glass. Different glass types (for instance, 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. Larger cavities provide lower (much better) U worths, with 12mm usually accepted as the preferred gap how well the cavity is sealed.

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

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In truth, IGUs can provide much better energy efficiency for all environments, especially in heated and air-conditioned homes. Cross-section information of single, double and triple-glazing systems Low emissivity glass (frequently understood as low-e glass) minimizes heat transfer. Low-e glass might be either high or low transmission: High transmission low-e glass has a finish that enables daytime from the sun to pass into your house to accomplish good solar heat gain, but reduces the quantity of the long wavelength infrared heat that can get away back through the window.

Low-e glass has either a pyrolytic finishing or a vacuum-deposited thin film metal finishing. Pyrolytic finishings are resilient and can be used for any glazing; vacuum-deposited finishings are soft and are only utilized within IGUs. Low-e coatings can significantly improve both U value and SHGC; nevertheless, they should be used correctly or they will either weaken or stop working to carry out as needed.

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Low-e coatings can be used in combination with clear, toned or reflective glass. Low-e coatings on glazing can decrease heat transfer where needed Picture: Department of Market, Science, Energy and Resources Toned glass has colouring additives included throughout manufacture. It is available in various colours, normally bronze, grey, blue and green.