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That window can send more solar heat in winter season than in summer. A west-facing window on a summer's afternoon has an angle of incidence from near 0 approximately 30 with a large reliable location of solar radiation. A north-facing window, in summer, has a high angle of incidence and a low reliable area of solar radiation, so can transmit less heat than a west-facing one.

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But you can rapidly and easily improve the thermal efficiency of your home by changing your windows. This is one of the most efficient techniques of renovation to achieve better thermal convenience. There are countless types of glass and frames to select from. Selecting the best ones is essential to improving the energy efficiency of your house.

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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 efficiency 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. Broader cavities offer lower (better) U values, with 12mm typically accepted as the preferred space how well the cavity is sealed.

If argon is installed to the cavity in place of air, moisture is reliably omitted the level of desiccant (drying agent). The spacer (metal or polymer strip) that separates the glass layers includes a desiccant to absorb any wetness. Inadequate desiccant may cause wetness to condense on the glass surface in cold conditions, decreasing thermal efficiency.

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In fact, IGUs can provide better energy performance for all climates, specifically 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 covering that enables daytime from the sun to enter the home to attain great 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 finish. Pyrolytic finishes are durable and can be used for any glazing; vacuum-deposited coatings are soft and are just used within IGUs. Low-e finishings can considerably enhance both U worth and SHGC; however, they must be utilized correctly or they will either deteriorate or stop working to perform as needed.

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