3. Air at 300 kPa, 900 K, flowing at 5 kg/s, enters a turbine operating at...

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3. Air at 300 kPa, 900 K, flowing at 5 kg/s, enters a turbine operating at steady state and exits at 100 kPa, 630 K. Power is produced by the turbine at the rate of 900 kW. Heat transfer to the surroundings occurs at an average outer surface temperature of 315 K. Kinetic and potential energy effects are negligible. For air as an ideal gas, determine (a) The rate of heat transfer to the surroundings, in kW (b) The rate of entropy production within the turbine, in kW/K Air P = 300 kPa T = 900 K m = 5 kg/s turbine Wout P = 100 kPa T = 630 K = 900 kW 3. Air at 300 kPa, 900 K, flowing at 5 kg/s, enters a turbine operating at steady state and exits at 100 kPa, 630 K. Power is produced by the turbine at the rate of 900 kW. Heat transfer to the surroundings occurs at an average outer surface temperature of 315 K. Kinetic and potential energy effects are negligible. For air as an ideal gas, determine (a) The rate of heat transfer to the surroundings, in kW (b) The rate of entropy production within the turbine, in kW/K Air P = 300 kPa T = 900 K m = 5 kg/s turbine Wout P = 100 kPa T = 630 K = 900 kW