A water pump is driven by a steam turbine. The steam at the inlet is at 10 bars and 280 C, and leaves the turbine at 1.5 bars. Saturated liquid water enters the pump at 20 C at 100,000 kg/hr, and the water exits at 100 bars. Consider both the pumping and expansion processes to be adiabatic and neglect kinetic-energy changes.
a. Determine the flow rate of steam of steam required to drive the turbine if both processes are reversible, in kg/hr.
b. If the turbine is replaced with an electric motor, what capacity motor is required, in kilowatts.
c. Determine the flow rate of steam required to drive the turbine if the turbine is 80.0 percent efficient and the pump is 60.0 percent efficient, in kg/hr.