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That window can transfer more solar heat in winter than in summer. A west-facing window on a summer's afternoon has an angle of occurrence from near 0 approximately 30 with a large effective location of solar radiation. A north-facing window, in summer, has a high angle of occurrence and a low efficient 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 performance of your home by changing your windows. There are thousands of types of glass and frames to choose from.

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There are various kinds of glass items to choose from. Single glazing uses a single pane of glass. Single glazing with clear glass is not extremely 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 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. Wider cavities offer lower (better) U worths, with 12mm normally accepted as the preferred space 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 consists of a desiccant to absorb any wetness. Insufficient desiccant may trigger moisture to condense on the glass surface in cold conditions, decreasing thermal performance.

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In truth, IGUs can provide better energy efficiency for all climates, specifically in heated and air-conditioned homes. Cross-section detail of single, double and triple-glazing systems Low emissivity glass (typically referred to as low-e glass) decreases heat transfer. Low-e glass might be either high or low transmission: High transmission low-e glass has a finishing that permits daylight from the sun to pass into the house to attain great solar heat gain, but minimizes the amount 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 finish. Pyrolytic finishings are resilient and can be used for any glazing; vacuum-deposited coatings are soft and are only used within IGUs. Low-e finishings can considerably enhance both U value and SHGC; however, they must be utilized correctly or they will either degrade or fail to carry out as required.

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Low-e coverings can be used in combination with clear, toned or reflective glass. Low-e finishings on glazing can lower heat transfer where required Photo: Department of Market, Science, Energy and Resources Toned glass has colouring ingredients consisted of during manufacture. It is available in various colours, typically bronze, grey, blue and green.