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+// Example 22_5

+clc;funcprot(0);

+//Given data

+p_1=100;// bar

+T_1=500;// °C

+p_2=8.5;// bar

+p_3=p_2-0.5;// bar

+p_4=0.05;// bar

+n_t=80;// The isentropic efficiency of the turbine in %

+n_lt=85;// The isentropic efficiency of lower stage of the turbine in %

+

+//Calculation

+//From h-s chart:

+h_1=3377;// kJ/kg

+h_2a=2750;// kJ/kg

+h_3=3478;// kJ/kg

+h_4a=2738;// kJ/kg

+// The isentropic efficiency of the expansion 1-2 is 80% as given in problem

+h_2=h_1-((n_t/100)*(h_1-h_2a));// kJ/kg

+// The isentropic efficiency of the expansion 3-4 is 85% as given in problem

+h_4=h_3-((n_lt/100)*(h_3-h_4a));// kJ/kg

+//From steam tables ,

+h_f5=137;// kJ/kg

+n_th1=(((h_1-h_2)+(h_3-h_4))/((h_1-h_f5)+(h_3-h_2)))*100;// The efficiency of the cycle in %

+// From h-s diagram

+h_6a=2305;// kJ/kg

+// The isentropic efficiency of the expansion 2-6 is 75% as given in problem

+n_lt=75;//The isentropic efficiency of the turbine in %

+h_6=h_2-((n_lt/100)*(h_2-h_6a));// kJ/kg

+n_th2=(((h_1-h_2)+(h_2-h_6))/(h_1-h_f5))*100;// The thermal efficiency of the cycle without reheating in %

+printf('\nThe thermal efficiency of the cycle with reheating=%0.1f percentage \nThe thermal efficiency of the cycle without reheating=%0.1f percentage',n_th1,n_th2);

+// The answer is bit different due to calculation error in the book

+