Why 795 steam enters an adiabatic turbine at 8 mpa

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Unformatted text preview: water-injected compressor is used in a gas turbine power plant. It is claimed that the power output of a gas turbine will increase because of the increase in the mass flow rate of the gas (air water vapor) through the turbine. Do you agree? Isentropic Efficiencies of Steady-Flow Devices 7–92C Describe the ideal process for an (a) adiabatic turbine, (b) adiabatic compressor, and (c) adiabatic nozzle, and define the isentropic efficiency for each device. 7–93C Is the isentropic process a suitable model for compressors that are cooled intentionally? Explain. 7–94C On a T-s diagram, does the actual exit state (state 2) of an adiabatic turbine have to be on the right-hand side of the isentropic exit state (state 2s)? Why? 7–95 Steam enters an adiabatic turbine at 8 MPa and 500°C with a mass flow rate of 3 kg/s and leaves at 30 kPa. The isentropic efficiency of the turbine is 0.90. Neglecting the kinetic energy change of the steam, determine (a) the temperature at the turbine exit and (b) the power output of the turbine. Answers: (a) 69.1°C, (b) 3052 kW 7–96 Reconsider Prob. 7–95. Using EES (or other) software, study t...
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