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diff --git a/3821/CH11/EX11.21/Example11_21.sce b/3821/CH11/EX11.21/Example11_21.sce new file mode 100644 index 000000000..a94cc8198 --- /dev/null +++ b/3821/CH11/EX11.21/Example11_21.sce @@ -0,0 +1,35 @@ +///Chapter No 11 Steam Boilers
+////Example 11.21 Page No 254
+///Find Mass of gas fowing throgh the chimney
+//Input data
+clc;
+clear;
+mf=8000; //Average coal consumption in m
+ma=18; //Fuel gases formed ccoal fired in m
+Tg=270+273; //Average temp of the chimney of water in degree celsius
+Ta=27+273; //Ambient temp in degree celsius
+hw=18; //Theoretical draught produced by the chimney in mm
+h1=0.6; //Draught is lost in friction in H1
+g=9.81;
+pi=3.142;
+
+
+//Calculation
+H=(hw/((353)*((1/Ta)-((1/Tg)*((ma+1)/ma))))); //Theoretical draught produced in water column in m
+H1=H*(((Tg/Ta)*(ma/(ma+1))-1)); //Theoretical draught produced in hot gas column in m
+gp=0.6*H1; //Draught is lost in friction at the grate and passing in m
+hgc=H1-gp; //Actual draught produced in hot gas column in m
+V=sqrt(2*g*hgc); //Velocity of the flue gases in the chimney in m/s
+rhog=((353*(ma+1))/(ma*Tg)); //Density of flue gases in Kg/m^3
+mg=mf/3600*(ma+1); //Mass of gas fowing throgh the chimney in Kg/s
+d=sqrt(mg/(rhog*(pi/4)*V)); //Diameter of flue gases in Kg/m^3
+
+///Output
+printf('Theoretical draught produced in water column= %f m \n ',H);
+printf('Theoretical draught produced in hot gas column= %f m \n',H1);
+printf('Draught is lost in friction at the grate and passing= %f m \n',gp);
+printf('Actual draught produced in hot gas column= %f \n',hgc);
+printf('Velocity of the flue gases in the chimney= %f m/s \n',V);
+printf('Density of flue gases= %f Kg/m^3 \n ',rhog);
+printf('Mass of gas fowing throgh the chimney= %f Kg/s \n ',mg);
+printf('Diameter of flue gases= %f Kg/m^3 \n ',d);
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