An uninsulated air compressor is to receive 0.5 kg/s of air at 100 kPa and 300 K, and compress the air to 620 K and 1000 kPa. The compressor loses 20 kW of heat to the surroundings, across a surface that is maintained at 300 K. (a) Determine the power consumed by the compressor and the entropy generation rate. Is the process possible? (b) Maintaining the same inlet conditions, exit pressure, surface temperature, and heat transfer rate, plot the power consumed and the entropy generation rate for exit temperatures ranging from 450 K to 700 K. At what exit temperatures is operation not possible? (c) Maintaining the same inlet and outlet conditions and surface temperature as in part (a), plot the power consumed and the entropy generation rate as the heat transfer varies from –100 kW to +50 kW. At what heat transfer rates is operation not possible?
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