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+
+clear;
+clc;
+printf("\t Example 6.16\n");
+m1=.12; //initial moisture content
+dT=85; //product of 85 degree is used in design purpose
+U=1700; //overall heat transfer coefficient
+m2=.4; //final moisture content
+r=20; //production rate
+ //4 kg of moisture is present in 100 kg product
+t=4*20/100; // moisture content in 20 kg moisture
+w=20-t; //dry solid weight
+i=w*m1/(1-m1); //initial moisture content
+j=i-t //water evaporated
+ds=2296.1; //latent heat for vaporisation at 85 degree in kj/kg
+h=j*ds; //heat required (assuming th esolid mix. enters at 85)
+//U*A*dT = j*ds
+A=h/(U*dT); //surface area of the roller required to produce aproduction rate of 20 kg product per hour
+printf("\n surface area of the roller required to produce aproduction rate of 20 kg product per hour:%f m^2",A/3.600);
+
+//end \ No newline at end of file