Solar reflectance index


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Solar reflectance index

(SRI)
A value that incorporates both solar reflectance and emittance in a single value to represent a material’s temperature in the sun. SRI quantifies how hot a surface will become relative to standard black and standard white surfaces. It is calculated using equations based on previously measured values of solar reflectance and emittance as laid out in the ASTM Standard E 1980. It is expressed as a decimal (0.0 to 1.0) or percentage (0 percent to 100 percent).
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In this study, all of the white paints generally exhibit industry acceptable initial solar reflectance index values, (2) and thus offer varying degrees of potential savings over a black roof baseline.
Green Building Council Solar Reflectance Index (SRI) of 78 for low-slope and 29 for steep-sloped roofs.
Solar Reflectance Index (SRI) rating: A measure of the roof's ability to reject solar heat.
The incorporation of native adaptive vegetation and highly efficient irrigation design has reduced landscape water demand by 68% while 22% of the roof area is covered with vegetation and 51% is covered with roofing materials with high SRI value (Solar Reflectance Index) which reduces heat island effect.
* ASTM E 1980 Standard Practice for Calculating Solar Reflectance Index of Horizontal and Low-Sloped Opaque Surfaces represents a new term, Solar Reflectance Index (SRI), which combines both TSR and TE into one value
The resulting value, known as Solar Reflectance Index (SRI), denotes surface temperature relative to a standard black and standard white surface.
The Cool Roof Rating Council publishes emittance values that can be used in evaluating membranes against the California Energy Code requirements for cool roofing The CRRC also provides a solar reflectance index that combines reflectance and emittance to simplify comparisons.
Researchers at LBNL have developed a solar reflectance index, which is the combined value of reflectivity arid emissivity, the measure of a surface's ability to emit its energy in the form of heat radiation.