Web EndMemo

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