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Window Energy Rating Scheme

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02 9498 2768
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02 9498 3816
Ground Floor, 71 Ridge Street
Gordon, NSW, 2072
Windows & Doors

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The Window Energy Rating Scheme (WERS) rates the energy impact of windows in housing anywhere in Australia. With up to 40% of a home’s energy for cooling or heating being lost or gained through windows, improving their thermal performance reduces energy costs and Australia’s greenhouse gas emissions. WERS rates custom windows in and allows consumers to make informed decisions about the products that they are incorporating into their house through the use of a 10 star rating. By providing a star rating, % improvement, U-Value and Solar Heat Gain Coefficient (SHGC) consumers, architects, builders, designers, energy assessors and government statutory bodies can compare the energy performance of whole windows (frame and glazing included) to achieve the best performance.
WERS custom ratings provide the energy performance of a window in terms of
- Cooling and Heating Stars - Are a comparison tool that allows users to quickly and easily compare the energy based performance of a window.

- % Cooling and % Heating - Is a percentage improvement to the overall heating and cooling load. Percentage improvement figures are compared with using base-case Generic Window 1 (3mm clear in standard aluminium frame). A negative percentage improvement figure indicates performance worse than the base-case window. A positive percentage improvement figure indicates performance better than the base-case window

- U-Value - which measures how well a product prevents heat from escaping. It is a measure of the rate of non solar heat loss or gain through a material or assembly. U-value ratings generally fall between 2.0-10.0 W/m2.K for Australian products. The rate of heat is indicated in the terms of the U-value of a window assembly which includes the effect of the frame, glass, seals and any spacers. The lower the U-value, the greater a window's resistance to heat flow and the better its insulating value. The U-value for a window takes account of the various U-values for the components making up the window, so you may see these in technical literature; UW is the value for whole window and because of its importance is usually abbreviated to U, UC is the value at the centre of glass, UF is the value for the frame.

- SHGC - which measures how well a product blocks heat caused by sunlight. The SHGC is the fraction of incident solar radiation admitted through a window, both directly transmitted, and absorbed and subsequently released inward. SHGC is expressed as a number between 0 and 1. The lower a window's SHGC, the less solar heat it transmits.

- Visible Transmittance (VT) - which measures how much light comes in through a product. It is an optical property that indicates the amount of visible light transmitted. VT is expressed as a number between 0 and 1. The higher the number, the more light is transmitted.

- Air Infiltration (AI) - which measures the Heat loss and gain occurring through infiltration through cracks in the window assembly. Air infiltration (or leakage) is expressed as L/s m2. The lower the air infiltration figure, the less air will pass through the cracks in the window assembly, improving the energy rating.

 

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