Question

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?

Answer 1

The answer is

d. To what temperature can the steam at 80 bar be cooled before a liquid will appear?