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+//Exa 8.7

+clc;

+clear;

+close;

+//given data

+// (a) For parallel flow arrangment

+del_t1=60-10;// in degree C

+del_t2=40-30;// in degree C

+del_tm=(del_t1-del_t2)/log(del_t1/del_t2);// in degree C

+q=100*10^3;// in W

+U=75;// in W/m^2 degree C

+// Formula q=U*A*del_tm;

+A=q/(U*del_tm);

+disp(A,"Area for paraller flow arrangment in square meter");

+// (b) For counter flow heat exchange

+del_t1=60-30;// in degree C

+del_t2=40-10;// in degree C

+// In this case

+del_tm=(del_t1+del_t2)/2;// in degree C

+A=q/(U*del_tm);

+disp(A,"Area For counter flow heat exchange in square meter");

+disp("In counter flow arrangment less area is required for the above purpose")
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