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+clc;
+//Example 22.9
+//page no 305 
+printf("\n Example 22.9 page no 305\n\n");
+//water is flowing from an elevated reservoir through a conduit to a turbine at a lower level and out of the turbine through a similar conduit  
+//refer to fig 22.2
+//since the diameter of the conduit is the same at location 1 and 2 ,kinetic energy effects can be  neglected and bernoulli eq. takes the form
+//P/rho  + z(g/g_c)  -h_s + h_f  = 0
+P1=30///pressure at point 1,psia
+z1=300//height of point 1,ft
+P2=18//pressure at point 2,psia
+z2=-10//height of point 2,ft
+rho=62.4//density
+m_dot=3600//mass flow rate,tons/hr
+W_dot =1000//output at the shaft of turbine,hp
+neta=0.9//efficiency of turbine
+h_s=W_dot*550*3600/(neta*m_dot*2000)//
+printf("\n h_s =%f ft.lbf/lb",h_s);
+//put this value in bernoulli eq.
+h_f=(P2-P1)*144/rho + (z2-z1) -h_s//frictional loss
+printf("\n frictional loss h_f=%f ft.lbf/lb",h_f)