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+clear ;
+clc;
+// Example 4.10
+printf('Example 4.10\n\n');
+printf('Page No. 106\n\n');
+
+// given
+T1 = 150;// Surface temperature in degree celcius
+T2 = 20;// Ambient temperature in degree celcius
+d = 0.100; //Outside diametr of pipe in m
+h = 10;// Outside film coefficient in W/m^2-K
+t = 25*10^-3;// thickness of insulation in m
+K = 0.040;// Thermal conductivity of insulation in W/m-K
+
+r2 = d/2;//in m
+r1 = r2+t;// in m
+Q = ((T1-T2)/((1/(2*%pi*r1*h))+(log(r1/r2)/(2*%pi*K))));// in W/m
+printf('The heat loss per unit length is %.0f W/m',Q)