As shown below, two steam streams flow into a mixer and the combined stream further enters...
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As shown below, two steam streams flow into a mixer and the combined stream further enters an adiabatic, steady-state turbine. The mixer operates at constant pressure and is not well insulated, with a rate of heat loss of 75.0 kW. The turbine has an isotropic efficiency of 85%. The known stream properties are labeled in the figure as shown. Kinetic and potential energy effects are negligible. The temperature and pressure of the surrounding environment are To = 25 C and P = 1 bar, respectively. P = 100.0 bar T = 100.0 C Inlet Net flow exergy in Outlet P = 100.0 bar T = 360.0 C a) (8 pts) Determine the mass flow rates of streams 1 and 2, in kg/s. b) (8 pts) Determine the power generated by the turbine, W (kW). c) (5 pts) Determine the temperature of stream 4, 7, in K. d) (8 pts) Determine the change in flow exergy, mer intet - Emeer outlet (kW), which represents the net flow of exergy into the entire system (mixer and turbine). e) (8 pts) Determine the exergy destruction, d, for the entire system. P3= 100.0 bar hy 2500.0 kj/kg m = 10.0 kg/s Work exergy out Heat exergy out Exergy destruction Total Outlet All streams are steam f) (8 pts) Using your results from above, complete the following exergy accounting table. Inlet exergy should equal outlet exergy. Exergy (kW) 7 = 85% P = 1.5 bar Percent of Net Flow Exergy in (%) 100% 100% As shown below, two steam streams flow into a mixer and the combined stream further enters an adiabatic, steady-state turbine. The mixer operates at constant pressure and is not well insulated, with a rate of heat loss of 75.0 kW. The turbine has an isotropic efficiency of 85%. The known stream properties are labeled in the figure as shown. Kinetic and potential energy effects are negligible. The temperature and pressure of the surrounding environment are To = 25 C and P = 1 bar, respectively. P = 100.0 bar T = 100.0 C Inlet Net flow exergy in Outlet P = 100.0 bar T = 360.0 C a) (8 pts) Determine the mass flow rates of streams 1 and 2, in kg/s. b) (8 pts) Determine the power generated by the turbine, W (kW). c) (5 pts) Determine the temperature of stream 4, 7, in K. d) (8 pts) Determine the change in flow exergy, mer intet - Emeer outlet (kW), which represents the net flow of exergy into the entire system (mixer and turbine). e) (8 pts) Determine the exergy destruction, d, for the entire system. P3= 100.0 bar hy 2500.0 kj/kg m = 10.0 kg/s Work exergy out Heat exergy out Exergy destruction Total Outlet All streams are steam f) (8 pts) Using your results from above, complete the following exergy accounting table. Inlet exergy should equal outlet exergy. Exergy (kW) 7 = 85% P = 1.5 bar Percent of Net Flow Exergy in (%) 100% 100%
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Related Book For
Elementary Principles of Chemical Processes
ISBN: 978-1119498759
4th edition
Authors: Richard M. Felder, ? Ronald W. Rousseau, ? Lisa G. Bullard
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