Superheated steam at 40 bar absolute and 500°C flows at a rate of 250 kg/min to an adiabatic turbine, where it expands to 5 bar. The turbine develops 1500 kW. From the turbine the steam flows to a heater, where it is reheated isobarically to its initial temperature. Neglect kinetic energy changes.
(a) Draw and label a process flow diagram.
(b) Write an energy balance on the turbine and use it to determine the outlet steam temperature.
(c) Write an energy balance on the heater and use it to determine the required (kW) to the steam.
(d) Verify that an overall energy balance on the two-unit process is satisfied.
(e) Suppose the turbine inlet and outlet pipes both have diameters of 0.5 meter. Show that it is reasonable to neglect the change in kinetic energy for this unit.
The question belongs to Chemical Engineering and it discusses about calculating energy balance on turbine and heater and verifying that overall energy balance is satisfied.
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