A turbine operates on superheated steam that enters at 80 bar absolute and 500˚C, and leaves the turbine at 7.5 bar absolute and 250˚C. The flow rate of the steam is 400 kg/min and the turbine operates adiabatically. The steam exiting the turbine goes to a heater, which is supplied with 2000
2kW of energy. The steam leaves the heater at 5 bar absolute. All of the pipes through which the
steam flows are 0.5 m (id) in diameter.
a. How much power is produced by the turbine? (4 marks)
b. What is the temperature of the steam leaving the heater? (4 marks)
c. What is the velocity (m/s) of the steam entering the turbine? (3 marks)
d. To what temperature can the steam at 80 bar be cooled before a liquid will appear?
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