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clc();
clear;
// To find the temperature at the free end is made of copper iron and glass
D = 3/48; // diameter in ft
L = 9/12; // Length of steam vessel in ft
T1 = 210; // Vessel temperature in degF
T2 = 80; // Air temperature in degF
th0 = T1-T2; // Temperature difference in degF
h = 1.44; // Assumed heat coefficient in Btu/hr-ft^2-degF
C = %pi*D; // Circumference of vessel in ft
A = %pi*D*D/4; // Area of vessel in ft^2
k = 36; // heat conductivity of copper in Btu/hr-ft-degF
m = sqrt(h*C/(k*A)); // in /ft
q=k*A*m*th0*(exp(m*L)-exp(-m*L))/(exp(m*L)+exp(-m*L));
// Heat loss by iron rod in Btu/hr
printf("The rate of heat loss by iron rod is %.d Btu/hr",q);
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