Index sri worksheet 2025

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Solar absorptance: The fraction of solar radiation absorbed by a surface. Solar absorptance=1 - solar reflectance.
A high SRI value indicates better performance in reflecting sunlight and reducing heat absorption, which can lead to lower energy costs and improved indoor comfort. For roofing materials, a good SRI value is typically above 78, signifying superior reflective properties.
Another measure of reflectance, depending only on the outgoing direction, is I/F, where I is the radiance reflected in a given direction and F is the incoming radiance averaged over all directions, in other words, the total flux of radiation hitting the surface per unit area, divided by .
SRI is calculated using solar reflectance (albedo) and emissivity (emittance). If you have these two values, you can use a calculator like the one at .
The Solar Reflectance Index (SRI) is the measure of solar reflectance and thermal emissivity of materials. Solar reflectance or reflectivity is the ability of a material to reflect solar energy from its surface into the atmosphere.
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SR is the fraction of solar energy that is reflected by a surface on a scale of 0 to 1. It doesnt factor in emissions of thermal radiation the way SRI does.
HOW IS AN SRI VALUE DETERMINED? An SRI value is calculated using the roof surfaces Solar Reflectance (SR) and Thermal Emittance (TE). The diagram below describes SR and TE, which are measured values that range from 0 to 1, with 1 being the most reflective or emissive.

solar reflectance index calculation worksheet