﻿ 000166_Calculation of Spectral Radiant Exitance from Building Materials.

# 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.