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diff --git a/167/CH8/EX8.17/ex17.sce b/167/CH8/EX8.17/ex17.sce
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+//example 17
+//charging of compressed air storage system
+clear
+clc
+P2=1000 //in kPa
+V=200 //volume of rigid tank in m^3
+R=0.287 //kPa-m^3/kg-K
+T2=300 //in K
+m2=P2*V/(R*T2) //final mass of the air  in kg
+P0=100 //atmospheric presssure in kPa
+T0=300 //atmospheric temperature in K
+o2=R*T0*(log(P2/P0)+P0/P2-1) //exergy of the pressurised air in the tank in kJ/kg
+Wrev=m2*o2 //reversible work in kJ
+printf("\n The minimum work requirement for the process is = %.0f MJ. \n",Wrev/1000);
+\ No newline at end of file