A medium size power station is used to produce 30 MW net power for a refinery. The station uses steam as the operating fluid and operates according to the Carnot cycle between the pressure limits of...

A medium size power station is used to produce 30 MW net power for a
refinery. The station uses steam as the operating fluid and operates
according to the Carnot cycle between the pressure limits of 0.4 bar and
35 bar. Steam enters the boiler as a saturated liquid and leaves it as a
dry saturated vapour.

(i) Calculate the thermal efficiency of the power station if the
isentropic efficiency of the steam turbine is 94%.

(ii) State main disadvantages of using the Carnot cycle as the basis for
a power station.

(iii) State the name of the cycle that is used in practice in power
stations, along with three key benefits over the Carnot cycle.