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+clc;funcprot(0);//EXAMPLE 20.39
+// Initialisation of Variables
+N=10000;.................//Compressor rpm
+v=660;............//Volume of air delivered in m^3/min
+p1=1;.................//Inlet pressure in bar
+t1=293;.............//Inlet temperature in K
+rp=4;.............//Pressure ratio
+etaisen=0.82;........//Isentropic efficiency
+Cf2=62;...............//Flow velocity in m/s
+rr=2;.............//Ratio of outer radius of impeller to inner radius of impeller
+ka=0.9;..............//Blade area co efficient
+fis=0.9;...........//Slip factor
+cp=1.005;..............//Specific heat at constant pressure in kJ/kgK
+ga=1.4;............//Ratio of specific heats
+R=287;..............//Gas constant for air in kJ/kgK
+//Calculations
+t21=t1*(rp^((ga-1)/ga));Cf1=Cf2;
+t2=t1+((t21-t1)/etaisen);..........//Final temperature of air
+m=(p1*10^5*v/60)/(R*t1);...............//Mass flow rate in m^3/s
+P=m*cp*(t2-t1);.........//Theoretical power in kW
+disp(t2,"Final temperature of air in Kevin:")
+disp(P,"Theoretical power in kW:")
+Cbl2=sqrt(1000*cp*(t2-t1)/fis);
+d2=60*Cbl2/(%pi*N);..........//Impeller diameter at outlet in m
+d1=d2/rr;...............//Impeller diameter at inlet in m
+disp(d2*100,"Impeller diameter at outlet in cm")
+disp(d1*100,"Impeller diameter at inlet in cm")
+b1=(v/60)/(2*%pi*(d1/2)*Cf1*ka);.........//Breadth of impeller at inlet in m
+disp(b1*100,"Breadth of impeller at inlet in cm:")
+Cbl1=Cbl2/rr;
+beta1=(atan(Cf1/Cbl1))*180/%pi;
+al2=(atan(Cf2/(fis*Cbl2)))*180/%pi;
+disp(beta1,"Impeller blade angle at inlet in degrees:")
+disp(al2,"Diffuser blade angle at inlet in degrees")
+
+