If a steam turbine accepted steam at 6 MPa and 600ºC and the steam left the turbine at 20 kPa with a quality of 1.0, the adiabatic efficiency would be nearest:

A) 88%
B) 85%
C) 81%
D) 78%


C) 81%

6 MPa and 600ºC and Table C-2 at 0.02 MPa and find h1 = 3658.4 kJ/kg and, for the given turbine, h2 = hg = 2609.7 kJ/kg . Fig. 6.21 shows the process. The enthalpy h2,s at the exit of the isentropic turbine would be found as follows:



The work output for the given turbine and for the isentropic turbine provide the efficiency:

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