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+//Exa 7.2

+clc;

+clear;

+close;

+//given data

+lamda=2*10^-6;// in m

+C1=0.374*10^-15;

+T=2000+273;// in K'

+C2=1.4388*10^-2;

+

+epsilon=0.3;

+sigma=5.67*10^-8;

+T1=300;// in K

+T2=200;// in K

+del_T=T1-T2;

+h=12;// in W/m^2 degree C

+d=4*10^-2;// diameter in m

+l=1;// in m

+A=%pi*d*l;

+// Heat transfer rate by radiation,

+q_r= epsilon*sigma*A*(T1^4-T2^4);// in W

+// Heat transfer rate by convection,

+q_c=h*A*del_T;// in W

+// Total heat transfer,

+q=q_r+q_c;

+// Formula q=U*A*del_T

+U=q/(A*del_T);// Overall heat tranfer coefficient

+disp(U,"Overall heat tranfer coefficient in W/m^2 degree C");

+

+//Note: Value of q_c is wrong in the book, so the answer in the book is wrong
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