Radiation Energy Calculator
Emissivity:
Surface Area:
Temperature:
Radiation Energy:



Stefan-Boltzmann Law calculates the radiation energy of a subject surface. All objects with temperature above absolute ZERO radiate energy. The Stefan-Boltzmann equation is:

  P = εAσT4

Where:

  P: Radiation Energy
  ε: Emissivity of the Surface. Check emissivity table below of common materials.
  A: Surface Area, in m^2.
  σ: Stefan-Boltzmann Constant, σ=5.67 × 10-8 W/m2•K4
  T: Absolute Temperature


Emissivity Table of Common Materials (Click to add)
Name
Temperature ( ̊C )
Emissivity
Water
38
.67
Ice, Smooth
0
.97
Snow, Granular
-8
.89
Wood (Oak, Planed)
38
.91
Soil Surface
38
.38
Silk Cloth
20
.78
Cotton Cloth
20
.77
Sand
20
.76
Limestone
38
.95
Glass, smooth
0-93
.92-.94
Granite
21
.45
Concrete
0-1093
.94
Clay
20
.39
Brick, red, rough
21
.93