Steam at 60 bar and 500 C is fed to a turbine in a power plant at a flow rate of 500 kg h-1 to generate electricity. The exit pressure of the steam from the turbine is 1 bar.

a) Assuming the turbine is adiabatic and reversible calculate the exit temperature of

the steam and the power generated by the turbine.

b) If the turbine in part a) operates with 80% efficiency, what will be the exit temperature of the steam? What will be the rate of entropy generation in the

turbine due to irreversibilities?

c) A throttling valve is placed before the adiabatic and reversible turbine described in (a) to reduce the pressure of the steam entering to the turbine to 30 bar. For this case, stating any assumptions made, calculate (i) the temperature of the steam entering the turbine, (ii) the power output by the turbine and (iii) the rate of entropy generation in the throttle valve due to irreversibilities?