### Heat Radiation of a Surface

 Heat Radiation of a Surface Fraction of heat energy absorbed,α = absorbtivity Fraction of heat energy reflected, ρ = reflectivity Fraction of heat energy passed thru.,τ = transmissivity (transparent; solids, liquids, & gasses) By definition,α + ρ + τ = 1.00 Black Body Radiation An ideal black body absorbs all incidentradiation so that,α = 1.00 therefore,ρ = 0 and τ = 0 Input Data t = deg C S.I. absolute temperature,Tk = t + 273.2 deg K Answer:Tk = deg K Input Data t = deg F U.S. absolute temperature,Tr = t + 459.8 deg R Answer:Tr = deg R Radiation Example Input Data Material surface emissivity,e = - Stefan-Boltzmann constant,σ = W / m^2-K^4 Dimension,L1 = m Dimension,L2 = m Surface temperature,t1 = deg C Results Area,A = L1*L2 Answer:A = m^2 Absolute temperature.T = C + 273 T = deg Abs Radiant thermal flux reflected,Q = e*σ*T^4 Answer:Q = Watts

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