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ME 326Homework Assignment #7
Due: 19 October 2011
Topic: 2
nd
Law and Isentropic Processes
Text: Chapters 67
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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View Full Document 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.
 Fall '07
 Schmidt

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