The absorptivity is the amount of radiation absorbed by a surface compared to what is absorbed by a black body.
|Aluminum, dull/rough polished||0.4 - 0.65|
|Aluminum. polished||0.1 - 0.40|
|Asbestos Cement, old||0.83|
|Iron, galvanized old||0.89 - 0.92|
|Light green paint||0.95|
|Limestone||0.33 - 0.53|
|Red clay brick||0.94|
|Snow, ice granules||0.33|
|Steel, galvanized (zink oxide)||0.65|
|Steel, galvanized weathered||0.8|
|White paint||0.25 - 0.4|
Work, heat and energy systems.
Solar radiation absorbed by various materials.
Radiation heat emissivity of unoxidized, oxidized and polished aluminum.
The radiation constant is the product between the Stefan-Boltzmann constant and the emissivity constant for a material.
Radiation emissivity of common materials like water, ice, snow, grass and more.
Heat transfer due to emission of electromagnetic waves is known as thermal radiation.
Daily surface energy from solar radiation.
Heat from sun transmitted through windows.
The radiation heat transfer emissivity coefficients for some common materials like aluminum, brass, glass and many more.