Calculation of Spectral Radiant Exitance from Building Materials.

Keyword

Temperature,Wavelength,Emissivity ration of material,Planck constant,Speed of light in vacuum,Boltzmann constant,Black body,Gray body approximation,Wien's displacement constant,Stefan Boltzmann constant,Spectral Radiant Exitance,Spectral Radiance,Radiant exitance,Peak Wavelength.

Reference

・『照明ハンドブック』(社団法人照明学会）
・『National Institute of Standards and Technology-Physics Laboratory』
・『2001 ASHRAE HANBOOK FUNDAMENTALS Inch-Pound Edition』

Remarks

・Source of Emissivity Ratio:『2001 ASHRAE HANBOOK FUNDAMENTALS Inch-Pound Edition』
・h=6.62606896*10^-34(J･s). Planck constant.
・c=299,792,458(m/s). Speed of light in vacuum.
・k=1.3806504*10^-23(J/K). Boltzmann constant.
・c1=2*π*h*c^2(W･m^2).
・c2=h*c/K(m･K).
・M=c1/λ^5/(exp(c2/(λ*T))-1)(W/(m^3)).
・L=c1/π/λ^5/(exp(c2/(λ*T))-1)(W/(st*m^3)).
・Gray body approximation=ε*M.
・Wien wavelength displacement law constant=2.8977685*10^-3(m･k).
・Stefan Boltzmann constant=5.6704*10^-8(W･m^-2*K^-4).
・About Emissivity Ratio:『Values are for room temperature unless otherwise noted in parentheses』(quotes from 『2001 ASHRAE HANBOOK FUNDAMENTALS Inch-Pound Edition』).

History

・2014/08/13：layout change.
・2009/03/27：Moved from www.am-consulting.co.jp to here.