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That window can transmit more solar heat in winter season than in summer. A west-facing window on a summer season's afternoon has an angle of incidence from near 0 up to 30 with a large efficient area of solar radiation. A north-facing window, in summer, has a high angle of occurrence and a low effective area of solar radiation, so can send 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. This is one of the most reliable techniques of restoration to attain enhanced thermal convenience. There are thousands of types of glass and frames to select from. Selecting the best ones is important to enhancing the energy effectiveness of your house.

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Single glazing with clear glass is not very efficient when it comes to heat loss or gain. To improve 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 homes 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 typically 6 to 18mm. Wider cavities offer lower (better) U worths, with 12mm normally accepted as the favored gap how well the cavity is sealed. Cavities need to be dry and well sealed to prevent moisture getting in.

If argon is installed to the cavity in place of air, wetness is reliably left out the level of desiccant (drying agent). The spacer (metal or polymer strip) that separates the glass layers contains a desiccant to absorb any moisture. Insufficient desiccant may cause wetness to condense on the glass surface in cold conditions, reducing thermal performance.

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In fact, IGUs can deliver better energy performance for all environments, especially in heated and air-conditioned homes. Cross-section detail of single, double and triple-glazing units Low emissivity glass (typically understood 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 enter your house to achieve excellent solar heat gain, however minimizes the quantity of the long wavelength infrared heat that can escape back through the window.

Low-e glass has either a pyrolytic coating or a vacuum-deposited thin film metal coating. Pyrolytic coatings are durable and can be used for any glazing; vacuum-deposited coverings are soft and are only used within IGUs. Low-e finishes can considerably improve both U worth and SHGC; however, they need to be used correctly or they will either deteriorate or stop working to perform as required.

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