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diff --git a/1808/CH2/EX2.13/Chapter2_Example13.sce b/1808/CH2/EX2.13/Chapter2_Example13.sce
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+clc
+clear
+//INPUT DATA
+p=50;//Power output in kW
+m=0.05;//mass flow rate in kg/s
+//C8H18 +2*12.5 O2 +2*12.5*3.76 N2= 8 CO2 +9 H2O +12.5 O2 +99N2 ;//Rate of heat transfer from the engine in kJ/kmol
+//Qcv+x1=x2+Wcv ;//rate of heat transfer
+x1=-249952;//inlet heat transfer in kJ/kmol
+x2=-2415445.5;//exit heat transfer in kJ/kmol
+
+//CALCULATIONS
+Wcv=(p/m)*114.28;//work done in J/kmol of fuel
+Qcv=x2+Wcv-x1;//Heat transfer rate from the engine in kJ/kmol
+
+//OUTPUT
+printf('(i)Heat transfer rate from the engine is %3.1f kJ/kmol',Qcv)
+
+
+
+
+