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MBER 2013
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SEPTEMBER 2013 CONFIDENTIAL
FRB30203_Applied Thermodynamics 2 condenser at P4 = P1 = 0.02 bar and the condenser is cooled by seawater. It is given that P2 = 145 bar, h2 = 98 kJ/kg, h3 = 3345 kJ/kg and h4 = 2200 kJ/kg. Answer these questions.
(Note: Use only Tables in your ‘Yunus Cengel’ textbook to solve all the questions. You can use water Moiller chart to solve some of the problems. If you're stuck on a question, make a realistic assumption results in order to continue. Show all works in order to qualify for marks.
For the properties at the pump, use this formula; ∆h = Cp ∆T + ν∆P. Cp = 4.187 kJ/kgK)
Question 1 Gas cycle
(a) Determine h, T and P for state 1.
(2 marks) (b) Write the combustion equation.
(1 marks) (c) Calculate the required mass flow rate of the fuel.
(2 marks) (d) Calculate the mass flow of the product of the combustion entering the turbine.
(2 marks) (e) Calculate the net power developed by the cycle and the cycle efficiency.
(2 marks)
Question 2 Steam cycle
(a) Determine h, T and P for state 1.
(2 marks) (b) Calculate the temperature T2.
(1 marks) (c) Calculate the mass flow rate of the steam.
(2 marks) (d) Calculate the mass flow rate of the sea water required if the sea water is not allowed to
rise more than 4°C.
(2 marks) (e) Calculate the cycle efficiency.
(2 marks)
SEPTEMBER 2013 CONFIDENTIAL
FRB30203_Applied Thermodynamics 3 Question 3
Combined cycle
(a) Calculate the cycle efficiency.
(2 marks)
END OF QUESTIONS
