The efficiency of a particular series of adiabatic gas turbines (expanders) correlates with power output according to the empirical expression: ή = 0.065 + 0.080 In |W|. Here. |W| is the absolute value of the actual power output in kW. Nitrogen gas is to be expanded from inlet conditions of 550 K and 6 bar to an outlet pressure of 12 bar.
For a molar flow rate of 175 mol s-1, what is the delivered power in kW? What is the efficiency of the turbine? What is the rate of entropy generation SG? Assume nitrogen to be an ideal gas with Cp = (7/2)R?.