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+// scilab Code Exa 18.17 three stage steam turbine

+

+t1=250;  // Initial Temperature in degree C

+n_T=0.75; // overall Efficiency of the turbine

+p1=10; //Initial Pressure in bar

+n_m=0.98; // Mechanical Efficiency

+m=5;

+N=1e3; // rotor Speed in RPM

+H=45; // height in m

+ro=1e3;

+g=9.81; // Gravitational acceleration in m/s^2

+Q=2.5; // discharge in m3/s

+

+P=(ro*Q*g*H)/(n_T);

+delh_T=P/(m*n_m*1e3);

+delh_st=delh_T/3;

+delh1_4ss=delh_T/n_T;

+

+//part(a)steam conditions

+h1=2940; // from Mollier diagram

+disp("(a)steam conditions at the turbine exit are:")

+h_4ss=h1-delh1_4ss;

+p4=1.2; // in bar

+disp("bar",p4,"pressure:")

+h4=2640;

+x4=0.98;

+t4=104.8; // in degree C

+disp("degree C",t4,"temperature:")

+disp(x4,"the dryness fraction is:")

+

+// part(b)stage Efficiencies

+h2=h1-delh_st;

+p2=5;

+h3=h2-delh_st;

+p3=2.5;

+h4=h3-delh_st;

+h2s=2795;

+h3s=2705;

+h4s=2605;

+n_st1=delh_st/(h1-h2s);

+n_st2=delh_st/(h2-h3s);

+n_st3=delh_st/(h3-h4s);

+disp ("%",n_st1*100,"(b)Efficiency of the first stage is")

+disp ("%",n_st2*100,"Efficiency of the second stage is")

+disp ("%",n_st3*100,"Efficiency of the third stage is")