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clc;
clear;
//EXample 4.6
sigma=5.67*10^-8 //[W/m^2.K^4]
e1=0.79;
e2=0.93;
T1=500 ; //[K]
T2=300 ; //[K]
D=70 //[mm]
D=D/1000 //[m]
L=3 //[m]
W=0.3 //Side of conduit [m]
A1=%pi*D*L //[sq m]
A1=0.659 //Approximate calculation in book in [m^2]
A2=4*(L*W) //[sq m]
Q=sigma*A1*(T1^4-T2^4)/(1/e1+((A1/A2)*(1/e2-1))) //[W]
printf("\n Heat lost by radiation is %f W",Q);
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