ME326_HW7_19Oct2011(1)

# ME326_HW7_19Oct2011( - ME 326-Homework Assignment#7 Due 19 October 2011 Topic 2nd Law and Isentropic Processes Text Chapters 6-7 Problem#1 Air

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ME 326-Homework Assignment #7 Due: 19 October 2011 Topic: 2 nd Law and Isentropic Processes Text: Chapters 6-7 Problem #1: Air enters a compressor at 77 °F and 14.7 psia and at a volumetric flow rate of 35 ft 3 /s and is compressed to a pressure of 300 psia. The compressor has an efficiency of 85%. For this device determine: a) the minimum possible temperature at the outlet assuming an ideal compression process (°F), b) the actual outlet temperature (°F), c) the power input to the compressor (hp). Problem #2: Nitrogen enters a compressor at 25 °C and 50 kPa and is compressed to 950 °C and 4 MPa. The mass flow rate of nitrogen is 2 kg/s. For this device determine: a) the power input (kW), b) the efficiency of the compressor, c) the rate of entropy generation (kW/K). Inlet: Air, 35 ft 3 /s 77 °F, 14.7 psia Outlet: 300 psia Compressor η = 85% Inlet: N 2 , 2 kg/s 25 °C, 50 kPa Outlet: 950 °C, 4 MPa Compressor

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Problem #3: An adiabatic turbine operates by accepting superheated water (steam) at 5
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## This note was uploaded on 12/14/2011 for the course ME 326 taught by Professor Schmidt during the Fall '07 term at University of Texas at Austin.

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ME326_HW7_19Oct2011( - ME 326-Homework Assignment#7 Due 19 October 2011 Topic 2nd Law and Isentropic Processes Text Chapters 6-7 Problem#1 Air

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