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diff --git a/3685/CH21/EX21.1/Ex21_1.sce b/3685/CH21/EX21.1/Ex21_1.sce
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+clc

+// Given that

+r_c = 3.5 // Compression ratio

+n_c = 0.85 // Efficiency of compressor

+p1 = 1 // Pressure in bar

+t1 = 300 // Temperature in K

+t3 = 310 // Temperature at the exit of the intercooler in K

+r_c_ = 3.5 // Compression ratio for high pressure compressor

+n_c_ = 0.85 // Efficiency of H.P. compressor

+e = 0.8 // Effectiveness of regenerator

+n_t = 0.88 // Efficiency of H.P. tubine

+t6 = 1100 // Temperature in H.P. tubine in K

+t8 = 1050 // Temperature at the entrance of L.P. turbine in K

+n_t_ = 0.88 // Efficiency of L.P. turbine

+Cp = 1.005 // Heat capacity of air in kJ/kgK

+Cp_ = 1.15 // Heat capacity of gases in kJ/kgK

+gama = 1.4 // Heat capacity ratio for air

+gama_ = 1.33 // Heat capacity ratio for gases

+printf("\n Example 21.1\n")

+p2 = r_c*p1

+p4 = p2*r_c_

+t2_s = t1*((r_c)^((gama-1)/gama))

+t2 = t1+((t2_s-t1)/n_c)

+t4_s = t3*((r_c_)^((gama-1)/gama))

+t4 = t3+((t4_s-t3)/n_c_)

+Wc = Cp*((t2-t1)+(t4-t3))

+t7 = t6 - (Wc/Cp_)

+t7_s = t6 - (t6-t7)/n_t

+r_p = (t6/t7_s)^(gama_/(gama_-1))

+p7 = p4/r_p

+t9_s = t8/((p7/p1)^((gama_-1)/gama_))

+t9 = t8-(t8-t9_s)*n_t_

+Wt_LP = Cp_*(t8-t9)

+W_T = Wt_LP+Wc

+Rw = Wt_LP/W_T

+Q1 = (Cp_*t6-Cp*t4)+Cp_*(t8-t7)

+n_plant = Wt_LP/Q1

+printf("\n Power output = %f kJ/kg,\n The overall efficiency = %f percent",W_T,n_plant*100)

+//The answers given in the book have round off error

+

+

+

+

diff --git a/3685/CH21/EX21.1/Ex21_1.txt b/3685/CH21/EX21.1/Ex21_1.txt
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+ 

+ Example 21.1

+

+ Power output = 581.689343 kJ/kg,

+ The overall efficiency = 25.871743 percent 
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