Question

2. Steam enters a steady-flow turbine with a mass flow rate of 15 kg/s at 550°C, 8 MPa, and a negligible velocity. The steam expands in the turbine to a superheated vapor at 1 MPa and 250°C where 15 percent of the steam is removed for some other use. The remainder of the steam continues to expand in the second turbine to the point where the pressure is 200 kPa and quality is 100 percent. In the first turbine, steam is losing heat to the surrounding air at 100 kPa and 25°C at a rate of 500 kW. However, the second turbine can be taken as an adiabatic turbine. Note that exergy transfer by heat can be neglected since the temperature at the point of heat transfer is the same as the environment temperature Determine: a) The actual total power output of the system. b) The maximum possible total power output ($W_{reversible}$). c) The second-law efficiency. d) The rate of exergy destroyed during the process. e) The exergy of the steam at the inlet condition of the first turbine.

          2. Steam enters a steady-flow turbine with a mass flow rate of 15 kg/s at 550°C, 8 MPa, and a negligible
velocity. The steam expands in the turbine to a superheated vapor at 1 MPa and 250°C where 15 percent
of the steam is removed for some other use. The remainder of the steam continues to expand in the
second turbine to the point where the pressure is 200 kPa and quality is 100 percent. In the first turbine,
steam is losing heat to the surrounding air at 100 kPa and 25°C at a rate of 500 kW. However, the
second turbine can be taken as an adiabatic turbine. Note that exergy transfer by heat can be neglected
since the temperature at the point of heat transfer is the same as the environment temperature
Determine:
a) The actual total power output of the system.
b) The maximum possible total power output ($W_{reversible}$).
c) The second-law efficiency.
d) The rate of exergy destroyed during the process.
e) The exergy of the steam at the inlet condition of the first turbine.

2. Steam enters a steady-flow turbine with a mass flow rate of 15 kg/s at 550°C, 8 MPa, and a negligible
velocity. The steam expands in the turbine to a superheated vapor at 1 MPa and 250°C where 15 percent
of the steam is removed for some other use. The remainder of the steam continues to expand in the
second turbine to the point where the pressure is 200 kPa and quality is 100 percent. In the first turbine,
steam is losing heat to the surrounding air at 100 kPa and 25°C at a rate of 500 kW. However, the
second turbine can be taken as an adiabatic turbine. Note that exergy transfer by heat can be neglected
since the temperature at the point of heat transfer is the same as the environment temperature
Determine:
a) The actual total power output of the system.
b) The maximum possible total power output (Wreversible).
c) The second-law efficiency.
d) The rate of exergy destroyed during the process.
e) The exergy of the steam at the inlet condition of the first turbine.

Added by Rachel L.

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