Adiabatic Compressor: Ideal Gas Temperature Change

  • #1

Homework Statement


A mixture of hydrogen, carbon monoxide and carbon dioxide is being fed to a compressor at 2.0 bar and 25 C. The overall flow rate is 17.47 SCMS and its composition is 73.5 mol% H2, 13.7 mol% CO and the balance CO2 The compressor operates adiabatically and reversibly with a discharge pressure of 6.0 bar. Assume ideal gas mixture behavior

  1. Calculate the compressor discharge temperature in C
You may assume that the specific heat capacities of the gasses at constant pressure are not a function of temperature and that they can be calculated using the following information. For diatomic (H2, CO): Cp = 7/2*R; for polyatomic CO2: Cp = 4*R where R = 8.314 J/mol K

Homework Equations



(1)[tex]\Delta U = -P\Delta V[/tex]
(2)[tex]\frac{T_1}{T_2} = (\frac{P_2}{P_1})^{R/C_p}[/tex]

The Attempt at a Solution


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I have not started any calculations yet. The biggest problem I am having is figuring out how having a mixture of diatomic and polyatomic molecules would affect temperature change. For example, if only diatomic compounds were present (e.g. H2 and CO), I could simply use equation 2 to calculate final temperature. How would I solve for final temperature with a combination of diatomic and polyatomic compounds?
 

Answers and Replies

  • #2
21,475
4,854
How is the heat capacity of an ideal gas mixture related to the heat capacity of each of its components?
 
  • #3
How is the heat capacity of an ideal gas mixture related to the heat capacity of each of its components?
[tex]C_{p(mixture)}=\sum C_{p(i)}x_i[/tex]

Thank You.
 

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