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

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But you can quickly and easily improve the thermal efficiency of your house by changing your windows. This is one of the most efficient techniques of restoration to achieve enhanced thermal comfort. There are thousands of kinds of glass and frames to select from. Choosing the best ones is necessary to improving the energy efficiency of your home.

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There are several kinds of glass items to choose from. Single glazing utilizes a single pane of glass. Single glazing with clear glass is not very efficient when it concerns heat loss or gain. To enhance performance, you can use single glazing with a more energy-efficient kind of glass such as low emissivity (low-e) glass.

The energy performance of IGUs also depends on: the residential or commercial 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 normally 6 to 18mm. Wider cavities provide lower (better) U values, with 12mm normally accepted as the preferred gap how well the cavity is sealed. Cavities need to be dry and well sealed to prevent wetness getting in.

If argon is installed to the cavity in place 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 absorb any wetness. Inadequate desiccant might cause moisture to condense on the glass surface in cold conditions, reducing thermal efficiency.

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IGUs can provide much better energy performance for all environments, especially in heated and air-conditioned houses. Cross-section detail of single, double and triple-glazing systems Low emissivity glass (commonly referred to as low-e glass) minimizes heat transfer. Low-e glass might be either high or low transmission: High transmission low-e glass has a coating that permits daytime from the sun to pass into the home to attain excellent solar heat gain, however reduces the amount of the long wavelength infrared heat that can escape back through the window.

Low-e glass has either a pyrolytic finishing or a vacuum-deposited thin film metal finish. Pyrolytic finishings are resilient and can be utilized for any glazing; vacuum-deposited coverings are soft and are only utilized within IGUs. Low-e finishings can considerably enhance both U worth and SHGC; however, they should be utilized correctly or they will either degrade or fail to perform as needed.

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Low-e coatings can be used in combination with clear, toned or reflective glass. Low-e coverings on glazing can decrease heat transfer where required Photo: Department of Industry, Science, Energy and Resources Toned glass has actually colouring ingredients included throughout manufacture. It is offered in numerous colours, generally bronze, grey, blue and green.