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.

Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN:9781305578296
Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Chapter22: Condensers
Section: Chapter Questions
Problem 8RQ: Four methods for controlling head pressure in an air-cooled condenser are ______, ______, _______,...
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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.
ist t
Reneric o
"nd
h Ts diaar
ntion of
s)
(ii)
Determine the dryness fraction of the steam that is fed to the
condenser.
(4 marks)
(iv)
Determine the specific enthalpy values at the four key points of
the cycle.
(6 marks)
Calculat
"Fic
of
the cycle
(5 Ma, KS)
(vi)
Determine the thermal efficiency of the cycle.
(1 mark)
(vii) Using the highest and lowest temperature values in the cycle, re-
calculate the efficiency of the cycle and show that it is equivalent
to the result in part (vi).
(2 marks)
arks).
2.
Transcribed Image Text: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. ist t Reneric o "nd h Ts diaar ntion of s) (ii) Determine the dryness fraction of the steam that is fed to the condenser. (4 marks) (iv) Determine the specific enthalpy values at the four key points of the cycle. (6 marks) Calculat "Fic of the cycle (5 Ma, KS) (vi) Determine the thermal efficiency of the cycle. (1 mark) (vii) Using the highest and lowest temperature values in the cycle, re- calculate the efficiency of the cycle and show that it is equivalent to the result in part (vi). (2 marks) arks). 2.
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