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Final State of Tank

  1. Jul 23, 2012 #1
    1. The problem statement, all variables and given/known data
    Given a tank filled with gas, you are to pump out a given amount and find the final state of the tank. Given the volume, gas (non-ideal), amount of gas in tank, flow rate, temperature and pressure, all at state 1. We can find density at state 2 from the tables, but we need another quantity. So we can also solve for enthalpy.

    2. Relevant equations
    E_out,mass = [itex]\int h + V/2 + gz dm[/itex]
    The KE and PE can be neglected due to high flow rate, so the equation simplifies to
    E_out,mass = [itex]\int h dm[/itex]
    but since h is not constant I am confused how to integrate this, and find h.

    3. The attempt at a solution
    I am trying to integrate numericaly but am not sure how to approch finding the intermidiate values of h.

    Thank you for the help.
     
    Last edited: Jul 23, 2012
  2. jcsd
  3. Jul 24, 2012 #2

    Simon Bridge

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    Well what does h depend on?
     
  4. Jul 24, 2012 #3
    Well h=u+pv, with u being the internal energy and p pressure and volume is constant for the tank.
     
  5. Jul 25, 2012 #4

    Simon Bridge

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    Well you need to express the things that change with m in terms of m... or, express dm in terms of the things that change.
     
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