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+//Example 14_6
+clc;clear;
+// Properties
+//For refrigerant R-134a at T=20°C
+v_f=0.0008157; // m^3/kg
+rho=1/v_f; // kg/m^3
+// Given values
+r_1=0.100;
+r_2=0.180;// The impeller inlet and outlet radii in m
+b_1=0.050;
+b_2=0.030;//The impeller inlet and outlet widths in m
+v=0.25;// m^3/s
+H=14.5; // Net head in m
+n=1720;// rpm
+g=9.81; // m/s^2
+
+// Calculation
+W_whp=rho*g*v*H;// The required water horsepower in W
+// We assume 100 percent efficiency such that bhp is approximately equal to W_whp
+bhp=W_whp/745.7;//The required brake horsepower in hp
+printf('The required brake horsepower,bhp=%0.0f hp\n',bhp);
+omega=(2*%pi*n)/60;
+beta_1=atand(v/(2*%pi*b_1*omega*r_1^2));
+printf('The blade inlet angle ,beta_1=%0.0f degree\n',beta_1);
+V_2t=(g*H)/(omega*r_2);
+V_2n=(v)/(2*%pi*r_2*b_2);
+beta_2=atand(V_2n/((omega*r_2)-V_2t));
+printf('The trailing edge blade angle ,beta_2=%0.0f degree\n',beta_2);