2010quiz6 - 650:462 Power Plants Quiz 5 Open book NAME...

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Center for Advanced Energy Systems Michael R. Muller, Director 640 Bartholomew Road, Piscataway NJ 08854 (908) 655 8469 FAX: (732) 445-0730 [email protected] http://caes.rutgers.edu 650:462 Power Plants Quiz 5 NAME: __________________________ Open book November 3, 2010 You are asked to look into a gas turbine system which was put into place with a novel air preheating system. Designed by a Stevens graduate, this system has worked extremely poorly. Management wants to know whether to remove the heat exchanger. It seems to be working correctly in that the exit temperature of the flue gas drops 300 °F when the heat exchanger is operating yet the efficiency of the system seems very poor. Analyze this situation by assuming the inlet temperature is 80 °F at atmospheric pressure, the pressure ratio in the compressor is 14, the exit temperature from the combustor is 1800 °F and the isentropic efficiency of the compressor and turbine are 90%. 1) Determine the efficiency of the cycle if the heat exchanger is off. 2)
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