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Index sri worksheet 2025

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The document is a Solar Reflectance Index (SRI) Calculation Worksheet that outlines the benefits and requirements of 'Cool Roof' products, which have high solar reflectance and thermal emittance. It explains how these roofing materials help reduce cooling loads and energy costs by staying cooler than conventional roofs. The document also details the necessity for roofing products to be tested and labeled by the Cool Roof Rating Council (CRRC) to ensure compliance with standards.

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How to calculate solar absorbance?

Solar absorptance: The fraction of solar radiation absorbed by a surface. Solar absorptance=1 - solar reflectance.

What is a good Sri for a roof?

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.

How to calculate reflectance value?

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 .

What information is needed to calculate the SRI of a material?

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 .

What is the Sri index?

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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Whats the difference between SR and Sri?

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.

What is needed to calculate Sri?

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.

Index sri worksheet 2025

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