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+///Chapter No 11 Steam Boilers

+////Example 11.19 Page No 252

+///Find Velocity of the flue gases in the chimney

+//Input data

+clc;

+clear;

+H2=38;              //Stack height in m

+d1=1.8;             //Stack diameter in m

+ma1=18;             //Flue gases per kg of the fuel burnt

+Tg1=277+273;        //Average temp of the flue gases in degree celsius

+Ta1=27+273;         //Temperature of outside air in degree celsius

+h11=0.4;            //Theorical draught is lost in friction in %

+g1=9.81;

+pi1=3.142

+

+//Calculation

+H3=H2*(((Tg1/Ta1)*(ma1/(ma1+1))-1)); //Theoretical draught produced in hot gas column in m

+gp1=0.40*H3;                     //Draught is lost in friction at the grate and passing in m

+hgc1=H3-gp1;                      //Actual draught produced in hot gas column in m

+V1=sqrt(2*g1*hgc1);               //Velocity of the flue gases in the chimney in m/s

+rhog1=((353*(ma1+1))/(ma1*Tg1));    //Density of flue gases in Kg/m^3

+mg1=rhog1*((pi1/4)*d1^2)*V1;        //Mass of gas fowing throgh the chimney in Kg/s

+

+

+//Output

+printf('Theoretical draught produced in hot gas column= %f m \n',H3);

+printf('Draught is lost in friction at the grate and passing= %f m \n',gp1);

+printf('Actual draught produced in hot gas column=%f m \n',hgc1);

+printf('Velocity of the flue gases in the chimney=%f m/s \n',V1);

+printf('Density of flue gases=%f Kg/m^3 \n',rhog1);

+printf('Mass of gas fowing throgh the chimney=%f Kg/s \n',mg1);