Thermodynamics HW Solutions 930

Thermodynamics HW Solutions 930 - Q_dot_21=-Q_dot_12...

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Chapter 12 Radiation Heat Transfer 12-40 "!PROBLEM 12-40" "GIVEN" D=2 "[m]" a=3 "[m], parameter to be varied" T_1=100 "[K]" T_2=240 "[K]" epsilon_1=0.1 "parameter to be varied" epsilon_2=0.8 "parameter to be varied" sigma=5.67E-8 "[W/m^2-K^4], Stefan-Boltzmann constant" "ANALYSIS" "Consider the sphere to be surface 1, the surrounding cubic enclosure to be surface 2" Q_dot_12=(A_1*sigma*(T_1^4-T_2^4))/(1/epsilon_1+(1-epsilon_2)/epsilon_2*(A_1/A_2))
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Unformatted text preview: Q_dot_21=-Q_dot_12 A_1=pi*D^2 A_2=6*a^2 a [m] Q 21 [W] 2.5 227.4 2.625 227.5 2.75 227.7 2.875 227.8 3 227.9 3.125 228 3.25 228.1 3.375 228.2 3.5 228.3 3.625 228.4 3.75 228.4 3.875 228.5 4 228.5 4.125 228.6 4.25 228.6 4.375 228.6 4.5 228.7 4.625 228.7 4.75 228.7 4.875 228.8 5 228.8 12-27...
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