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That window can transmit more solar heat in winter season than in summer. A west-facing window on a summer's afternoon has an angle of occurrence from near 0 approximately 30 with a big efficient area of solar radiation. A north-facing window, in summer season, has a high angle of incidence 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 quickly improve the thermal performance of your home by replacing your windows. There are thousands of types of glass and frames to choose from.

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

The energy efficiency of IGUs likewise depends on: the residential or commercial 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 typically 6 to 18mm. Larger cavities supply lower (much better) U values, with 12mm typically accepted as the favored space how well the cavity is sealed. Cavities need to be dry and well sealed to avoid 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 includes a desiccant to absorb any wetness. Inadequate desiccant may trigger wetness to condense on the glass surface area in cold conditions, decreasing thermal performance.

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In truth, IGUs can deliver much 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 known as low-e glass) minimizes heat transfer. Low-e glass may be either high or low transmission: High transmission low-e glass has a coating that allows daytime from the sun to pass into the house to attain great 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 finish or a vacuum-deposited thin film metal coating. Pyrolytic coatings are durable and can be used for any glazing; vacuum-deposited finishings are soft and are just used within IGUs. Low-e coatings can significantly enhance both U worth and SHGC; however, they should be utilized correctly or they will either weaken or fail to perform as required.

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