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+// scilab Code Exa 6.2 radially tipped Centrifugal blower 3000rpm

+P=150; // Power Output in kW

+N=3e3; // Speed in RPM

+d2=40/100; // outer diameter of the impeller in m

+d1=25/100; // inner diameter of the impeller in m

+b=8/100; // impeller width at entry in m

+n_st=0.7; // stage efficiency

+V1=22.67; // Absolute Velocity at entry in m/s

+ro=1.25; // density of air in kg/m3

+

+// part(a) determining the pressure developed

+u2=%pi*d2*N/60;

+u1=d1*u2/d2;

+w_ac=u2^2;

+delh_s=n_st*w_ac;

+delp=ro*delh_s;

+disp ("mm W.G." ,delp/9.81,"(a)the pressure developed is")

+

+// part (b) determining the power required

+A1=%pi*d1*b;

+m=ro*V1*A1;

+P=m*w_ac/10e2;

+disp("kW",P,"(b)Power required is")