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Really quick question about finding specific volume in thermodynamics

  1. Oct 7, 2009 #1

    rock.freak667

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    Here is the situation, I have a Mollier Diagram(pressure-enthalpy diagram) for refrigerant R134. I had to draw a refrigeration cycle on the that find the specific volumes and enthalpies for each point. I read off the enthalpies at all 4 state points. Found the specific volumes for states 1 and 2 as they are in the superheated region where the specific volume lines contours are. But I don't know how to find the volumes at states 3 and 4.


    I see state 3 lies on the saturated vapor line, so I think I should just use that specific volume as hf at the pressure.

    State 4 lies at a point of known pressure and on a line where the quality(x) can be seen. To find v4, do I just use v4=vf+xvfg, or can this be somehow read off this diagram?
     
  2. jcsd
  3. Oct 7, 2009 #2
    v4=vf+xvfg is fine for the specific volume of state 4.
     
  4. Oct 8, 2009 #3

    rock.freak667

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    thanks then!
     
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