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The radiation constant is the product between the Stefan-Boltzmann constant and the emissivity constant for a material.
The radiation constant is the product between the Stefan-Boltzmann constant - σ - and the emissivity constant - ε - of a material.
The radiation constant for some typical products:
Building Materials - Radiation Constants
(10-8 W/m2 K4)
- ε -
|Black body ||5.7 ||1 |
|Brass, dull ||1.3 ||0.22 |
|Brick, red ||5.3 ||0.93 |
|Cast iron, rough oxidized ||5.1 ||0.9 |
|Copper, polished ||0.28 ||0.04 |
|Cotton ||4.4 ||0.77 |
|Glass ||5.1 ||0.9 |
|Lampblack paint ||5.5 ||0.96 |
|Oil paint ||5.4 ||0.94 |
|Paper ||3.1 ||0.55 |
|Plaster ||5.6 ||0.98 |
|Sand ||5.1 ||0.9 |
|Silk ||4.3 ||0.75 |
|Silver, polished ||0.17 ||0.03 |
|Tin, unoxidized ||0.23 ||0.04 |
|Water, 0 - 100oC ||5.4 ||0.95 |
|Wood ||5.1 ||0.9 |
|Wool ||4.3 ||0.75 |
|Wrought iron, dull oxidized ||5.4 ||0.9 |
|Wrought iron, polished ||1.6 ||0.25 |
|Zinc, tarnished ||1.4 ||0.25 |
σ = 5.6703 10-8 (W/m2K4) = 0.1714 10-8 (Btu/(h ft2 oR4) ) - Stefan-Boltzmann Constant
ε = emissivity coefficient of the object (ε = 1 for a black body)
- Work, heat and energy systems.
- Solar radiation absorbed by various materials.
- Radiation heat emissivity of unoxidized, oxidized and polished aluminum.
- Synchronous and full load speed of amplitude current (AC) induction motors.
- Heat loss vs. surface temperature.
- 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.
- Radiation surface absorptivity.
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