A combined gas-vapor power cycle uses a simple Brayton cycle for the air cycle and a simple Rankine cycle for the water vapor cycle. Atmospheric air enters the gas compressor at 101 kPa and 32°C, and the maximum gas cycle temperature is 1027°C. The pressure ratio is 11. The gas flow leaves the heat exchanger at the saturation temperature of the steam that flows through the heat exchanger at a pressure of 9 MPa. The Rankine cycle operates between the pressure limits of 9 MPa and 7.5 kPa, steam enters the turbine at 400°C.
a) Draw the diagram of the process including all known information
b) Prepare a table of properties for the Brayton cycle and include all the equations and operations necessary to obtain the data.
c) Calculate the net work of the Brayton cycle in kJ/kg
d) Calculate the efficiency of the Brayton cycle
e) Prepare a table of properties for the Rankine cycle and include all the equations and operations necessary to obtain the data.
f) Calculate the net work of the Rankine cycle in kJ/kg
g) Calculate the efficiency of the Rankine cycle
h) Calculate the efficiency of the combined cycle.
i) For the combined cycle to produce 150 MW of net power, determine the mass flow of air required in kg/s
A combined gas-vapor power cycle uses a simple Brayton cycle for the air cycle and a simple Rankine cycle for the water
-
- Site Admin
- Posts: 899603
- Joined: Mon Aug 02, 2021 8:13 am