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+clc();

+clear;

+

+// to compute the temperatures at different points 

+

+a=0.53;                             // thermal diffusivity in ft^2/hr

+M=4;                                // the value of 4 is selected for M

+x=6/12;                             // thickness of wall in ft

+delx=2/12;

+delr=delx^2/(a*M);                  // at time interval the heat transfeered will change the temperature of sink from tb2 to tb2o

+printf("the time interval is to be of %.3f hr \n",delr);

+

+// the temperature is constant in the whole wall initiallt 100 degF and afterwards it changes to 1000 degF. 

+// we know qo=Z*delx*dely*rho*Cp(tb2'-tb2)/delr    So on solving equations we get tb2'=(tb1+tb3+ta2+tc2)/4

+// Using above formula we can calculate the different temperatures as given below in degF

+

+ta=[100 550 775 888 944];

+tb=[100 550 775 888 944];

+tc=[100 550 775 888 944];

+td=[100 550 775 888 944];

+printf(" the temperatures at different positions 0.052 hr after, are as follows \n");

+printf(" the temperature at point a is %d degF \n",ta(5));

+printf(" the temperature at point a is %d degF \n",tb(5));

+printf(" the temperature at point a is %d degF \n",tc(5));

+printf(" the temperature at point a is %d degF \n",td(5));
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