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Radiation Constants Building Materials

The radiation constant is the product between the Stefan-Boltzmann constant and the emissivity constant for a material

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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)

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