Final State of Tank

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Homework Statement


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.

Homework 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.

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.
 
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Answers and Replies

  • #2
Simon Bridge
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Well what does h depend on?
 
  • #3
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Well h=u+pv, with u being the internal energy and p pressure and volume is constant for the tank.
 
  • #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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