Sep 19, 2017

AN ADIABATIC STEADY-STATE, STEADY-FLOW TURBINE EXPANDS STEAM FROM AN INITIAL STATE CHARACTERIZED…

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An adiabatic steady-state, steady-flow turbine expands steam from an initial state characterized by 60 bar and 500°C (State 1) to a final state at 10 kPa at which the quality x = 0.9 (state 2).

a. Is the process possible?

b. Determine the turbine work output in kJ kg–1.

c. What would have been the quality x2s at the exit and isentropic work output for the same initial conditions and the same exit P2 = 10 kPa but with quality X2s (state 2s)? Also calculate isentropic efficiency.

d. Determine the work output if the final state (2) is to be reached through a combination of a reversible adiabatic expansion process followed by reversible heat addition at same exit pressure until the final state is reached.

e. Determine the maximum possible (optimum) work, w12, opt in kJ kg–1.

f. Calculate the availability efficiency (ηavail) based on the actual inlet and exit states and availability efficiency ηavail,0 based on the optimum work obtained when end state is dead state.


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