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That window can send more solar heat in winter than in summertime. A west-facing window on a summertime's afternoon has an angle of incidence from near 0 up to 30 with a big efficient area of solar radiation. A north-facing window, in summer, has a high angle of incidence and a low effective area of solar radiation, so can send less heat than a west-facing one.

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You can rapidly and easily improve the thermal efficiency of your house by changing your windows. There are thousands of types of glass and frames to pick from.

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Single glazing with clear glass is not really efficient 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 performance of IGUs also 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 thickness is typically 6 to 18mm. Wider cavities offer lower (better) U values, with 12mm generally accepted as the favored gap how well the cavity is sealed. Cavities must be dry and well sealed to prevent wetness getting in.

If argon is installed to the cavity in place of air, wetness is dependably excluded the level of desiccant (drying representative). The spacer (metal or polymer strip) that separates the glass layers contains a desiccant to absorb any moisture. Inadequate desiccant might cause wetness to condense on the glass surface area in cold conditions, reducing thermal efficiency.

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IGUs can provide much better energy efficiency for all climates, especially in heated and air-conditioned houses. Cross-section detail of single, double and triple-glazing units Low emissivity glass (commonly known as low-e glass) decreases heat transfer. Low-e glass might be either high or low transmission: High transmission low-e glass has a coating that permits daylight from the sun to pass into the house to accomplish great solar heat gain, however minimizes the amount of the long wavelength infrared heat that can escape 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 finishes are soft and are just utilized within IGUs. Low-e finishings can substantially improve both U value and SHGC; nevertheless, they must be used properly or they will either degrade or fail to perform as required.

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Low-e finishes can be utilized in mix with clear, toned or reflective glass. Low-e coatings on glazing can reduce heat transfer where required Image: Department of Industry, Science, Energy and Resources Toned glass has actually colouring additives consisted of during manufacture. It is offered in various colours, usually bronze, grey, blue and green.