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+//(6.12)    A turbine operating at steady state receives air at a pressure of p1 = 3.0 bar and a temperature of T1=  390 K. Air exits the turbine at a pressure of p2 = 1.0 bar. The work developed is measured as 74 kJ per kg of air flowing through the turbine. The turbine operates adiabatically, and changes in kinetic and potential energy between inlet and exit can be neglected. Using the ideal gas model for air, determine the turbine efficiency.
+
+//solution
+
+//variable initialization
+P1 = 3                                        //pressure of air entering in bar
+T1 = 390                                      //temperature of air entering in kelvin
+P2 = 1                                        //pressure of exit air
+Wcvdot = 74                                   //work developed in kj/kg
+
+//from table A-22,at 390k
+h1 = 390.88                                   //in kj/kg
+pr1 = 3.481
+
+pr2 = (P2/P1)*pr1
+
+//from interpolation table A-22
+h2s = 285.27                                 //in kj/kg
+
+Wcvdots = h1 - h2s
+
+eta = Wcvdot/Wcvdots
+
+printf('the turbine efficiency is : \n\t eta = %f',eta)
+\ No newline at end of file