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+// Example 22_12

+clc;funcprot(0);

+//Given data

+T_1=300;// °C

+p_1=35;// bar

+p_2=25;// bar

+p_2a=1.5;// bar

+p_3=0.1;// bar

+n_t=80/100;// The isentropic efficiency for both sections of the turbine

+gradT=10;// °C

+m_w=1;// kg

+C_p=4.2;// kJ/kg.°C

+

+// Calculation

+// From h-s chart:

+h_1=2970;// kJ/kg

+h_2=2504;// kJ/kg

+h_3=2197;// kJ/kg

+h_f2=264;// kJ/kg (at 1.5 bar)

+h_f2a=h_f2-(m_w*C_p*gradT);// kJ/kg

+h_f3=190;// kJ/kg (at 0.1 bar)

+m=(h_f2a-h_f3)/(h_2-h_f3);// kg/kg of steam

+W=(h_1-h_2)+((1-m)*(h_2-h_3));// kJ/kg

+Q_s=h_1-h_f2a;// kJ/kg

+n_th=(W/Q_s)*100;// Thermal efficiency of the plant

+printf('\n(a)Bleed steam per kg of steam supplied to the steam turbine=%0.3f kg/kg of steam \n(b)The thermal efficiency of the plant=%0.1f percentage',m,n_th);

+// The answer provided in the textbook is wrong