Question: Air enters a compressor at ambient conditions of 100 kPa and 20C at a rate of 4.5 m3/s with a low velocity, and exits at

Air enters a compressor at ambient conditions of 100 kPa and 20°C at a rate of 4.5 m3/s with a low velocity, and exits at 900 kPa, 60°C, and 80 m/s. The compressor is cooled by cooling water that experiences a temperature rise of 10°C. The isothermal efficiency of the compressor is 70 percent. Determine
(a) The actual and reversible power inputs,
(b) The second-law efficiency, and
(c) The mass flow rate of the cooling water.

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Air is compressed in a compressor that is intentionally cooled The actual and reversible power inputs the second law efficiency and the mass flow rate of cooling water are to be determined Assumptions 1 Steady operating conditions exist 2 Potential energy change is negligible 3 Air is an ideal gas with constant specific heats Properties The gas constant of air is R 0287 kJkgK and the specific heat of air at room is cp 1005 kJkgK the specific heat of water at room temperature is c 418 kJkgK Tables A2 A3 Analysis a The mass flow rate of air is R m pv RT W The power input ... View full answer

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