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Shading coefficient: Wikis

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Shading coefficient, is a value that determines one type of thermal performance of a glass unit (panel or window) in a building.

It is basically the ratio of solar energy (due to direct sunlight) passing through a glass unit to the solar energy which passes through a 3 mm. It is referred to as an indicator to how the glass is thermally insulating the interior when there is direct sunlight on the panel or window.

The shading coefficient (SC) depends on the colour of glass and degree of reflectivity. It also depends on the type of reflective metal oxides for the case of reflective glass. Sputte-coated reflective and/or Sputter-coated low-emissivity glasses tend to have lower SC compared to the same pyrolithically coated reflective and/or low-emissivity glass.

It is usually a value ranging from 1.00 to 0.00, but experiments show that the value of SC is between 0.98~0.10.

It is known to designers and architects that SC value plays a significant role in the selection of glass, specially at high-temperature areas. Usually at those areas, low SC is needed to lower the solar heat gain through the glass. It works with the direct sunlight, and with the absence of sunlight SC loses its significance in design.


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