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+// scilab Code Exa 7.3 Calculation on a small compressor
+pr=1.6; // Compressor pressure ratio
+N1=54e3; // Speed in RPM
+n_c=0.85; // efficiency
+m_a=1.5778; //  in kg/s
+cp_a=1.009; // Specific Heat of air at Constant Pressure in kJ/(kgK)
+gamma=1.4;
+// part (a) determining the power required to drive the compressor
+T01=300;  // Entry Temperature in Kelvin
+p01=1.008; //  Entry Pressure in bar
+n=(gamma-1)/gamma;
+T2s=T01*(pr^n);
+delh_s=cp_a*(T2s-T01)/n_c;
+P=m_a*delh_s;
+disp("kW",P,"(a)Power required to drive the compressor is")
+
+// part (b) determining the speed, mass flow rate, pressure ratio and power required of a geometrically similar compressor
+// geometrically similar compressor of 3 times the size of small compressor is constructed 
+N2=N1/3;
+disp("rpm",N2,"(b)(i)speed of a geometrically similar compressor is")
+m2=9*m_a;
+disp("kg/s",m2,"(b)(ii)mass flow rate of a geometrically similar compressor is")
+disp(pr,"(b)(iii)pressure ratio of a geometrically similar compressor is")
+P2=9*P;
+disp("kW",P2,"(b)(iv)Power required is")
+