3. 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. (vii) Using the highest and lowest temperature values in the cycle, recalculate the efficiency of the cycle and show that it is equivalent to the result in part (vi). (viii) Calculate the thermal efficiency of the power station if the isentropic efficiency of the steam turbine is 94%. (ix) State main disadvantages of using the Carnot cycle as the basis for a power station. (x) State the name of the cycle that is used in practice in power stations, along with three key benefits over the Carnot cycle.

3. 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. (vii) Using the highest and lowest temperature values in the cycle, recalculate the efficiency of the cycle and show that it is equivalent to the result in part (vi). (viii) Calculate the thermal efficiency of the power station if the isentropic efficiency of the steam turbine is 94%. (ix) State main disadvantages of using the Carnot cycle as the basis for a power station. (x) State the name of the cycle that is used in practice in power stations, along with three key benefits over the Carnot cycle.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

3. 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.
(vii)
Using the highest and lowest temperature values in the cycle, recalculate the efficiency of the cycle and
show that it is equivalent to the result in part (vi).
(viii)
Calculate the thermal efficiency of the power station if the isentropic efficiency of the steam turbine is
94%.
(ix)
State main disadvantages of using the Carnot cycle as the basis for a power station.
(x)
State the name of the cycle that is used in practice in power stations, along with three key benefits over
the Carnot cycle.

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