Building Materials - Radiation Constants
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:
(10-8 W/m2 K4)
- ε -
|Cast iron, rough oxidized||5.1||0.9|
|Water, 0 - 100oC||5.4||0.95|
|Wrought iron, dull oxidized||5.4||0.9|
|Wrought iron, polished||1.6||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.
Absorbed Solar Radiation
Solar radiation absorbed by various materials.
Aluminum - Radiation Heat Emissivity
Radiation heat emissivity of unoxidized, oxidized and polished aluminum.
Emissivity Coefficients common Products
The radiation heat transfer emissivity coefficients for some common materials like aluminum, brass, glass and many more.
Induction Motors - No. of Poles and Synchronous vs. Full Load Speed
Synchronous and full load speed of amplitude current (AC) induction motors.
Pipes - Bare Surface Heat Loss
Heat loss vs. surface temperature.
Radiation Emissivity Coefficients
Radiation emissivity of common materials like water, ice, snow, grass and more.
Radiation Heat Transfer
Heat transfer due to emission of electromagnetic waves is known as thermal radiation.
Solar Radiation - Daily Surface Energy
Daily surface energy from solar radiation.
Solar Radiation through Windows
Heat from sun transmitted through windows.
Surface Radiation Absorptivity
Radiation surface absorptivity.