Problem 6.16: Air is compressed in a steady-state, insulated flow device. The air enters at 1 bar, 25 °C and exits at 5 bar, 200 °C. a) Determine the amount of work needed for this compression. b) Calculate the entropy generation. c) What is the minimum amount of work necessary to compress air from 1 bar, 25 °C to 5 bar? d) What would be the temperature at the exit of the compressor in part (c)? Assume air to be an ideal gas with Cp = 30 J/molK. Problem 6.17: A new compressor has just been delivered to your plant. In order to check its performance you order your staff to make a test run using air. Your staff reports to you the following results: air at a flow rate of 50 mol/min was compressed from 1 bar and 25 °C to 10 bar. The temperature at the exit of the compressor was measured and found to be 450 °C. a) What is the power (in kW) consumed by the compressor? b) What is the efficiency of the compressor? Assume air to be an ideal gas with CP = 3.5R.
Problem 6.16: Air is compressed in a steady-state, insulated flow device. The air enters at 1 bar, 25 °C and exits at 5 bar, 200 °C.
a) Determine the amount of work needed for this compression.
b) Calculate the entropy generation.
c) What is the minimum amount of work necessary to compress air from 1 bar, 25 °C to 5 bar?
d) What would be the temperature at the exit of the compressor in part (c)? Assume air to be an ideal gas with Cp = 30 J/molK.
Problem 6.17: A new compressor has just been delivered to your plant. In order to check its performance you order your staff to make a test run using air. Your staff reports to you the following results: air at a flow rate of 50 mol/min was compressed from 1 bar and 25 °C to 10 bar. The temperature at the exit of the compressor was measured and found to be 450 °C.
a) What is the power (in kW) consumed by the compressor?
b) What is the efficiency of the compressor? Assume air to be an ideal gas with CP = 3.5R.
Since we only answer up to 3 sub-parts, we’ll answer the first 3. Please resubmit the question and specify the other subparts (up to 3) you’d like answered.
Given that-
Initial Pressure, P1= 1 bar
Initial temperature, T1= 250 C= 298.15 K
Final Pressure, P2 = 5 bar
Final temperature, T2= 2000 C = 473.15 K
Temperature T= 250 C= 298.15 K
Specific heat at constant pressure, for air, Cp= 30 J/Kmol
Now, air is flowing through insulated device so as the change in heat, Q= 0
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