Saturated liquid water enters a steady-state, adiabatic throttling valve at T = 100°C . The pressure of the fluid leaving the valve is P = 0.5 bar. It has been suggested that perhaps it would make...

Saturated liquid water enters a steady-state, adiabatic
throttling valve at T = 100°C . The pressure of
the fluid leaving the valve is P = 0.5 bar. It has been
suggested that perhaps it would make more sense to
replace the valve with a turbine––the desired pressure
drop will still occur, but some work would be
obtained from the turbine.
A. Determine the physical state of the fluid leaving
the valve.
B. Determine the rate at which entropy is generated
in the valve per kilogram of entering water.
C. Determine the maximum work that could be
produced by a turbine per kilogram of entering
water if the stream entering the turbine was
identical to the stream entering the valve, and the
pressure leaving the turbine was P = 0.5 bar.
D. Compare the physical state of the fluid leaving
the “idealized” turbine described in part C to
the physical state of the fluid leaving the valve as
described in part A. Are they identical? Can you
rationalize why they are, or are not, identical?

Jun 08, 2022

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Saturated liquid water enters a steady-state, adiabatic throttling valve at T = 100°C . The pressure of the fluid leaving the valve is P = 0.5 bar. It has been suggested that perhaps it would make...

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