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+// Exa 2.2 Determining the infinitesimal stage efficiencies

+p1=1.02; // Initial Pressure in bar

+T1=300;  // Initial Temperature in K

+

+// part(a)

+T2=315;  // Final Temperature in K

+gamma=1.4; // Specific Heat Ratio

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

+sg=1; // Specific Gravity of air

+delp=(1500)*(0.001)*(g)*(sg); // Total Pressure Loss Across the Diffuser in kPa

+p2=p1+(0.01*delp);

+pr=p2/p1; // Pressure Ratio

+T2s=T1*(pr^((gamma-1)/gamma));

+n_c=(T2s-T1)/(T2-T1); // Efficiency in %

+n_p=((gamma-1)/gamma)*((log(p2/p1))/(log(T2/T1)));

+disp ("%",n_c*100,"(a)Efficiency of the compressor is")

+disp ("%",n_p*100,"and infinitesimal stage Efficiency or polytropic efficiency of the compressor is")

+

+// part(b) Determining the infinitesimal stage efficiency

+

+p2_b=2.5;  // Final pressure in bar

+n_b=0.75; // Efficiency

+pr_b=p2_b/p1; // Pressure Ratio

+T2s_b=T1*(pr_b^((gamma-1)/gamma));

+T2_b=T1+((T2s_b-T1)/n_b);

+n_p_b=((gamma-1)/gamma)*((log(p2_b/p1))/(log(T2_b/T1)));

+disp ("%" ,n_p_b*100,"(b)infinitesimal stage Efficiency or polytropic efficiency of the compressor is")