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That window can transmit more solar heat in winter season than in summertime. A west-facing window on a summertime's afternoon has an angle of occurrence from near 0 approximately 30 with a big reliable area 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 transmit less heat than a west-facing one.

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You can rapidly and easily enhance the thermal performance of your home by replacing your windows. There are thousands of types of glass and frames to pick from.

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There are various kinds of glass products to pick from. Single glazing utilizes a single pane of glass. Single glazing with clear glass is not extremely efficient when it pertains to heat loss or gain. To improve efficiency, you can use single glazing with a more energy-efficient kind of glass such as low emissivity (low-e) glass.

The energy efficiency 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 density is generally 6 to 18mm. Wider cavities supply lower (much better) U values, with 12mm usually accepted as the favored gap how well the cavity is sealed. Cavities should be dry and well sealed to prevent wetness getting in.

If argon is set up to the cavity in location of air, moisture is reliably excluded the level of desiccant (drying representative). The spacer (metal or polymer strip) that separates the glass layers contains a desiccant to soak up any wetness. Insufficient desiccant may cause moisture to condense on the glass surface in cold conditions, decreasing thermal performance.

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In fact, IGUs can provide better energy efficiency for all climates, specifically in heated and air-conditioned houses. Cross-section information of single, double and triple-glazing units Low emissivity glass (commonly referred to as low-e glass) minimizes heat transfer. Low-e glass may be either high or low transmission: High transmission low-e glass has a covering that enables daylight from the sun to pass into the house to accomplish good 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 covering or a vacuum-deposited thin movie metal finishing. Pyrolytic coverings are resilient and can be utilized for any glazing; vacuum-deposited coverings are soft and are just utilized within IGUs. Low-e finishings can considerably enhance both U value and SHGC; however, they need to be used correctly or they will either degrade or stop working to perform as required.

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Low-e coatings can be used in mix with clear, toned or reflective glass. Low-e finishes on glazing can reduce heat transfer where needed Image: Department of Industry, Science, Energy and Resources Toned glass has colouring additives included during manufacture. It is readily available in various colours, generally bronze, grey, blue and green.