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diff --git a/2873/CH9/EX9.15/Ex9_15.sce b/2873/CH9/EX9.15/Ex9_15.sce
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+// Display mode
+mode(0);
+// Display warning for floating point exception
+ieee(1);
+clear;
+clc;
+disp("Engineering Thermodynamics by Onkar Singh Chapter 9 Example 15")
+r=10;//pressure ratio
+Cp=1.0032;//specific heat of air in KJ/kg K
+y=1.4;//expansion constant
+T3=1400;//inlet temperature of gas turbine in K
+T1=(17+273);//ambient temperature in K
+P1=1*10^5;//ambient pressure in Pa
+Pc=15;//condensor pressure in KPa
+Pg=6*1000;//pressure of steam in generator in KPa
+T5=420;//temperature of exhaust from gas turbine in K
+disp("In gas turbine cycle,T2/T1=(P2/P1)^((y-1)/y)")
+disp("so T2=T1*(P2/P1)^((y-1)/y)in K")
+T2=T1*(r)^((y-1)/y)
+disp("T4/T3=(P4/P3)^((y-1)/y)")
+disp("so T4=T3*(P4/P3)^((y-1)/y) in K")
+T4=T3*(1/r)^((y-1)/y)
+disp("compressor work per kg,Wc=Cp*(T2-T1) in KJ/kg")
+Wc=Cp*(T2-T1)
+disp("turbine work per kg,Wt=Cp*(T3-T4) in KJ/kg ")
+Wt=Cp*(T3-T4)
+disp("heat added in combustion chamber per kg,q_add=Cp*(T3-T2) in KJ/kg ")
+q_add=Cp*(T3-T2)
+disp("net gas turbine output,W_net_GT=Wt-Wc in KJ/kg air")
+W_net_GT=Wt-Wc
+disp("heat recovered in HRSG for steam generation per kg of air")
+disp("q_HRGC=Cp*(T4-T5)in KJ/kg")
+q_HRGC=Cp*(T4-T5)
+disp("at inlet to steam in turbine,")
+disp("from steam table,ha=3177.2 KJ/kg,sa=6.5408 KJ/kg K")
+ha=3177.2;
+sa=6.5408;
+disp("for expansion in steam turbine,sa=sb")
+sb=sa;
+disp("let dryness fraction at state b be x")
+disp("also from steam table,at 15KPa, sf=0.7549 KJ/kg K,sfg=7.2536 KJ/kg K,hf=225.94 KJ/kg,hfg=2373.1 KJ/kg")
+sf=0.7549;
+sfg=7.2536;
+hf=225.94;
+hfg=2373.1;
+disp("sb=sf+x*sfg")
+disp("so x=(sb-sf)/sfg ")
+x=(sb-sf)/sfg
+disp("so hb=hf+x*hfg in KJ/kg K")
+hb=hf+x*hfg
+disp("at exit of condenser,hc=hf ,vc=0.001014 m^3/kg from steam table")
+hc=hf;
+vc=0.001014;
+disp("at exit of feed pump,hd=hd-hc")
+disp("hd=vc*(Pg-Pc)*100 in KJ/kg")
+hd=vc*(Pg-Pc)*100
+disp("heat added per kg of steam =ha-hd in KJ/kg")
+ha-hd
+disp("mass of steam generated per kg of air=q_HRGC/(ha-hd)in kg steam per kg air")
+q_HRGC/(ha-hd)
+disp("net steam turbine cycle output,W_net_ST=(ha-hb)-(hd-hc)in KJ/kg")
+W_net_ST=(ha-hb)-(hd-hc)
+disp("steam cycle output per kg of air(W_net_ST)=W_net_ST*0.119 in KJ/kg air")
+W_net_ST=W_net_ST*0.119 
+disp("total combined cycle output=(W_net_GT+W_net_ST) in KJ/kg air ")
+(W_net_GT+W_net_ST)
+disp("combined cycle efficiency,n_cc=(W_net_GT+W_net_ST)/q_add")
+n_cc=(W_net_GT+W_net_ST)/q_add
+disp("in percentage")
+n_cc=n_cc*100
+disp("In absence of steam cycle,gas turbine cycle efficiency,n_GT=W_net_GT/q_add")
+n_GT=W_net_GT/q_add
+disp("in percentage")
+n_GT=n_GT*100
+disp("thus ,efficiency is seen to increase in combined cycle upto 57.77% as compared to gas turbine offering 48.21% efficiency.")
+disp("overall efficiency=57.77%")
+disp("steam per kg of air=0.119 kg steam per/kg air")
+
+
+
+
+
+
+
+
diff --git a/2873/CH9/EX9.15/Ex9_15_1.jpg b/2873/CH9/EX9.15/Ex9_15_1.jpg
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diff --git a/2873/CH9/EX9.15/Ex9_15_2.pdf b/2873/CH9/EX9.15/Ex9_15_2.pdf
new file mode 100755
index 000000000..6af85ce8c
--- /dev/null
+++ b/2873/CH9/EX9.15/Ex9_15_2.pdf