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+///Chapter No 11 Steam Boilers
+////Example 11.22 Page No 256
+///Find Efficeincy of chimney draught
+///Input data
+clc;
+clear;
+H=45;          //Chimney height in m
+Tg=370+273;    //Temperature of flue gases in degree celsius
+T1=150+273;    //Temperature of flue gases in degree celsius
+ma=25;         //Mass of the flue gas formed in Kg/kg of a cosl fired
+Ta=35+273;     //The boiler temperature in degree celsius
+Cp=1.004;      //fuel gas
+
+//Calculation
+//Efficeincy of chimney draught in %
+A=(H*(((Tg/Ta)*(ma/(ma+1)))-1))/(Cp*(Tg-T1))*100;
+
+//Output
+printf('Efficeincy of chimney draught= %f percent \n',A);