1.A geothermal supply of hot water at 500 kPa, 150aC, is fed to an insulated flash evaporator at the rate of 1.5 kg/so A stream of saturated liquid at 200 kPa is drained from the bottom of the flash evaporator, and a stream of saturated vapor at 200 kPa is drawn from the top and fed to a turbine. The turbine has an isentropic efficiency of70 percent and an exit pressure of 15 kPa. Evaluate the second law for this process for a control volume that includes the flash evaporator and turbine.
2. A geothermal supply of hot water at 80 Ibf/in2, 300 F, is fed to an insulated flash evaporator at the rate of 10000 Ibm/h. A stream of saturated liquid at 30Ibf/in.2 is drained from the bottom of the flash evaporator, and a stream of saturated vapor at 30 Ibf/in2 is drawn from the top and fed to a turbine. The turbine has an isentropic efficiency of 70 percent and an exit pressure of 2 Ibf/in.2 . Evaluate the second law for this process for a control volume that includes the flash evaporator and turbine.
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