Nitrogen gas (N₂) is compressed in an adiabatic turbo compressor (open system). At the inlet, the nitrogen temperature is 290 K, and the pressure is 100 kPa. At the outlet, the temperature has increased to 510 K, and the pressure to 600 kPa. The surroundings of the compressor are at 285 K and 100 kPa. Use constant specific heat capacities at the average temperature of this process. Calculate: a) The specific compressor work in kJ/kg. b) The isentropic compressor work in kJ/kg and the compressor’s isentropic efficiency. c) The specific compression work for 2-stage compression at optimal intermediate pressure with a polytropic exponent of 1.2. d) The entropy generation rate Sgen in the compressor (the adiabatic compressor mentioned at the start of the problem) in kW/K and the exergy destruction rate Xdestroyed in kW when the volumetric flow rate at the inlet is 20 liters/s.
Nitrogen gas (N₂) is compressed in an adiabatic turbo compressor (open system). At the inlet, the nitrogen temperature is 290 K, and the pressure is 100 kPa. At the outlet, the temperature has increased to 510 K, and the pressure to 600 kPa. The surroundings of the compressor are at 285 K and 100 kPa. Use constant specific heat capacities at the average temperature of this process. Calculate:
a) The specific compressor work in kJ/kg.
b) The isentropic compressor work in kJ/kg and the compressor’s isentropic efficiency.
c) The specific compression work for 2-stage compression at optimal intermediate pressure with a polytropic exponent of 1.2.
d) The entropy generation rate Sgen in the compressor (the adiabatic compressor mentioned at the start of the problem) in kW/K and the exergy destruction rate Xdestroyed in kW when the volumetric flow rate at the inlet is 20 liters/s.
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