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Reading Thermodynamics Table

  1. Sep 22, 2014 #1
    1. The problem statement, all variables and given/known data
    Determine the phase of the steam (compress liquid, saturated liquid, saturation mixture, saturated vapor, superheated vapor, or supercritical vapor). Use A-4 Table.

    T=110 Celsius
    P=55.732 kPa

    2. Relevant equations
    A-4 Table: http://che31.weebly.com/uploads/3/7/4/3/3743741/handout_g1-saturatedwater-temperature.pdf


    3. The attempt at a solution

    From A-4 Table, Saturated Water at 110 Celsius got 143.38 kPa. For the problem it has same temperature, but lower pressure. So it means it's superheated vapor, right?

    what I want to know is, how am I supposed to tell it's whether saturated water, saturated mixture or saturated vapor. or even supercritical vapor.

    Like, if the problem was to determine phase at T=110 Celsius and P=143.38kPa, should it be saturated liquid or saturated mixture?
     
  2. jcsd
  3. Sep 22, 2014 #2
    Right.
    Well, in this problem, the only choices are superheated vapor or supercritical vapor. You know it's not supercritical vapor, because the temperature is not above the critical temperature.
    From the information provided, it can be either saturated liquid, saturated vapor, or a saturated mixture. To resolve this, you would need more information, like the macroscopic density of the mixture.

    Chet
     
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