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:
Product | Radiation 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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