What is Solar reflectivity? What is solar reflectance?
What is Solar Thermal? What is Solar Infrared Emittance?
What is Total Solar REflectivity?
Solar / Thermal / Infrared
Emittance - the ability of a material to emit or radiate heat energy that
builds up in the material. This measured as per standards like:
ASTM E-903, ASTM E 1980-11, EN 673:2001
and EN 410-2011 (Laboratory)
ASTM E-1918 - Reflectance (field
test for variegated surfaces)
ASTM C-1549 - Reflectance
(portable device)
ASTM E-408 - Emittance
(Laboratory)
ASTM C-1371 - Emittance (portable
device)
ASTM E 1980 - The SRI is used to determine compliance with LEED requirements and is calculated according to ASTM E 1980 using values for reflectance and emissivity. Emissivity is a material’s ability to release absorbed energy. To meet LEED requirements, a roofing material must have a SRI of 29 or higher for steep slope (above 2:12) roofing and an SRI value of 78 or higher for low slope (2:12 or less) roofing.
There is one more term in the industry regarding this topic and i.e, Total Solar Reflectivity (TSR) measures the total amount of solar energy (visible, infrared and
ultraviolet) that is reflected from a surface. TSR is expressed as a percentage from 1 to 100,
with the higher the number the more solar radiation that is reflected. Whilst typically lighter
colours often have a high TSR value and dark colors have a lower TSR value. Let see the below chart for ready reference:
Let see the testing method at LAB and at the site level:
Let see the testing method for products by measuring the applied product, the same can be adopted at site level after the work is completed:
Many thanks for
Google.com, Ergodock and Bryan Kiep from where the details are collected.
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