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+clear ;
+clc;
+// Example 4.5
+printf('Example 4.5\n\n');
+printf('Page No. 95\n\n');
+
+// given
+m_h = 1.05;// Mass flow rate of hot liquid in kg/s
+Thi = 130;// Inlet Temperature of hot liquid in degree celcius
+Tho = 30;// Outlet Temperature of hot fluid in degree celcius
+Cph =  2.45*10^3;// Specific heat capacity of hot liquid in J/kg-K
+
+m_c = 4.10;// Mass flow rate of cold liquid in kg/s
+Tci =  20;// Inlet Temperature of cold liquid in degree celcius
+Cpc =  4.18*10^3;// Specific heat capacity of cold liquid in J/kg-K
+
+A = 6.8;// Area of heat exchanger in m^2
+Q = m_h*Cph*(Thi-Tho);// in Watts
+
+//From heat balance
+// m_c*Cpc*(Tci-Tco)= m_h*Cph*(Thi-Tho)= UAlTm = Q
+Tco = ((Q/(m_c*Cpc))+Tci);
+printf(' The Outlet Temperature of cold fluid is %.0f degree celcius\n',Tco)
+// As counter flow  heat exchanger 
+T1 = Thi-Tco;
+T2 = Tho-Tci;
+Tm = ((T1-T2)/log(T1/T2));
+
+U = (Q/(A*Tm));
+printf('The overall heat transfer coefficient is %.0f W/sq.m K \n',U)// Deviation in answer due to direct substitution
+
+