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

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Single glazing with clear glass is not extremely effective when it comes to heat loss or gain. To improve efficiency, 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 also depends on: the properties of each layer of glass. Various 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 generally 6 to 18mm. Wider cavities supply lower (much better) U worths, with 12mm typically accepted as the preferred space how well the cavity is sealed. Cavities must be dry and well sealed to avoid wetness getting in.

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

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In truth, IGUs can deliver better energy efficiency for all climates, particularly in heated and air-conditioned houses. Cross-section detail of single, double and triple-glazing systems Low emissivity glass (commonly known as low-e glass) lowers heat transfer. Low-e glass may be either high or low transmission: High transmission low-e glass has a coating that enables daylight from the sun to pass into your home to attain good solar heat gain, but lowers the amount of the long wavelength infrared heat that can leave back through the window.

Low-e glass has either a pyrolytic covering or a vacuum-deposited thin movie metal finish. Pyrolytic finishes are resilient and can be utilized for any glazing; vacuum-deposited coatings are soft and are only used within IGUs. Low-e finishings can substantially improve both U value and SHGC; nevertheless, they should be utilized properly or they will either degrade or stop working to carry out as required.

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Low-e finishes can be used in mix with clear, toned or reflective glass. Low-e finishes on glazing can reduce heat transfer where required Picture: Department of Industry, Science, Energy and Resources Toned glass has colouring ingredients included during manufacture. It is offered in various colours, normally bronze, grey, blue and green.