The high-pressure turbine in a steam power plant has an inlet state of 3 MPa, 500°C....
The high-pressure turbine in a steam power plant has an inlet
state of 3 MPa, 500°C. A 20% of the inlet mass flow is extracted
from the turbine at a location where the pressure is 1 MPa and the
temperature is 350°C. The remaining flow continuous to expand in
the turbine, exiting the turbine at 2 bar, 200°C. Determine
the:
(a) inlet and exit flow exergies per mass flow rate of the inlet
flow,
(b) isentropic efficiency of the turbine,
(c) second-law efficiency of the turbine,
(d) exergy destructed in the turbine per mass flow rate of the
inlet flow.
Homework Answers
a) Exergy E=H-TS
Inlet is 1, Intermediate extraction is 2 and Exit is 3 (in suffixes to steam properties')
If 
is the mass flow rate at inlet,
b) Work done by the turbine is
Work done in isentropic process is
Isentropic efficiency is
c) Second law Efficiency is ratio between Actual work to Exergy used
d)Exergy destruction per unit mass is 
=70kJ/kg
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