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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's afternoon has an angle of incidence from near 0 as much as 30 with a large effective area of solar radiation. A north-facing window, in summer, has a high angle of incidence and a low effective location 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 performance of your house by changing your windows. This is among the most reliable approaches of renovation to accomplish better thermal comfort. There are thousands of kinds of glass and frames to select from. Selecting the ideal ones is important to enhancing the energy performance of your house.

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Single glazing with clear glass is not very effective when it comes to heat loss or gain. To improve 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 in between each sheet of glass. IGUs generally offer better energy efficiency than single glazing, since they transmit less energy. The energy performance of IGUs also depends on: the residential or commercial 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. Broader cavities provide lower (much better) U values, 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 excluded the level of desiccant (drying agent). The spacer (metal or polymer strip) that separates the glass layers contains a desiccant to take in any moisture. Insufficient desiccant might cause wetness to condense on the glass surface area in cold conditions, lowering thermal efficiency.

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IGUs can deliver better energy performance for all environments, particularly in heated and air-conditioned houses. Cross-section detail of single, double and triple-glazing systems Low emissivity glass (frequently called low-e glass) reduces heat transfer. Low-e glass may be either high or low transmission: High transmission low-e glass has a finishing that permits daylight from the sun to pass into the home to attain good solar heat gain, however minimizes the quantity 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 finishing. Pyrolytic finishes are durable and can be utilized for any glazing; vacuum-deposited finishes are soft and are only used within IGUs. Low-e finishes can substantially enhance both U worth and SHGC; however, they must be utilized properly or they will either degrade or stop working to perform as required.

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