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+// Example 22_8

+clc;funcprot(0);

+//Given data

+p_1=50;// bar

+T_1=400;// °C

+x=0.96;// Dryness

+p_2=5;// bar

+p_3=0.03;// bar

+T_3=250;// °C

+n_i=80;// Isentropic efficiency of both the expansions in %

+n_m=99;//The mechanical efficiency in %

+n_g=96;// The generator efficiency in %

+

+//Calculation

+//From h-s chart:

+h_1=3198;// kJ/kg

+h_2a=2675;// kJ/kg

+h_3=2955;// kJ/kg

+h_4a=2153;// kJ/kg

+dh_1=((n_i/100)*(h_1-h_2a));//(h_1-h_2) kJ/kg

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

+dh_2=((n_i/100)*(h_3-h_4a));//(h_3-h_4) in kJ/kg

+W=dh_1+dh_2;//Work done per kg of steam kJ/kg

+W_e=W*(n_m/100)*(n_g/100);// The work used out of 1060 kJ for the generation of electricity in kJ/kg

+m_g=(1000/W_e)*3.6;// The steam generated in the boiler per 1 kW power generation in kg/kW-hr

+//From steam tables,

+h_fg=1643.5;// kJ/kg

+Lh=x*h_fg;// The latent heat of steam lost per kg

+m_s=(m_g*(h_3-h_2))/Lh;// The steam used in the reheater in kg

+m=m_g+m_s;// Steam generated by the boiler per kW-hr output from the generator in kg

+printf('\nThe mass of steam generated by the boiler per kW-hr=%0.3f kg',m);

+// The answer vary due to round off error

+