Radiation Constants Building Materials

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:

ProductRadiation Constant
(10-8  W/m2 oC4)(10-8  Btu/(h ft2 oF4))
Black body 5.7 0.173
Brass, dull 0.152 0.036
Brick 5.16 0.156
Cast iron, rough oxidized 5.09 0.154
Copper, polished 0.119 0.028
Cotton 4.23 0.128
Glass 5.13 0.155
Lamp black 5.16 0.156
Oil paint 4.30 0.130
Paper 4.43 0.134
Plaster 5.16 0.156
Sand 4.20 0.127
Shavings 4.10 0.124
Silk 4.30 0.130
Silver 1.19 0.0046
Tin 0.26 0.0077
Water 3.70 0.112
Wood 4.17 0.126
Wool 4.30 0.130
Wrought iron, dull oxidized 5.16 0.156
Wrought iron, polished 1.55 0.047
Zinc, dull 0.152 0.036

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)

Related Topics

Related Documents

Tag Search

Search the Engineering ToolBox

- "the most efficient way to navigate!"

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

3D Engineering ToolBox Extension to SketchUp - add parametric components to your SketchUp model

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your SketchUp model with the Engineering ToolBox - SketchUp Extension/Plugin - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp from the Sketchup Extension Warehouse!

Translate the Engineering ToolBox!
About the Engineering ToolBox!

close