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Density of Saturated Vapor R-134a

  1. Dec 22, 2009 #1
    Hi all,

    Just for fun I am writing a program in Octave for calculating the thermodynamic properties of R-134a. I am using the equations in the Dupont properties booklet.
    http://www2.dupont.com/Refrigerants/en_US/products/Suva/Suva134a.html

    My functions for calculating the liquid density, liquid volume(of course), and the saturated pressure are less than 0.5% off of the published data.
    My question is what am I missing to calculate the saturated vapor properties?

    Thank You,
    MON
     
  2. jcsd
  3. Dec 22, 2009 #2

    Mech_Engineer

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    You can find the saturated properties of "regular" R134a here: http://webbook.nist.gov/chemistry/fluid/, but I'm not sure what the difference is between standard R134a and the dupont one, which seems to be made to function more effectively as a replacement in R12 systems.
     
  4. Dec 22, 2009 #3
    Right, I have that link as well.
    I can use the tables effectively, and I have found the properties at the conditions I needed (55/100)degF. My question is one of curiosity at this point. How to calculate it programmatically.
     
  5. Dec 22, 2009 #4
    Using an equation of state such as what is published in this paper - http://scitation.aip.org/getpdf/servlet/GetPDFServlet?filetype=pdf&id=JPCRBU000023000005000657000001&idtype=cvips&prog=normal [Broken]
     
    Last edited by a moderator: May 4, 2017
  6. Dec 24, 2009 #5
    Bump.
     
  7. Dec 28, 2009 #6

    Mech_Engineer

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    What, our answers weren't good enough? Don't just bump the thread, elaborate what it is you're still looking for :grumpy:
     
  8. Dec 28, 2009 #7
    I guess I must have a subscription at work for the link I provided earlier, but a quick google search reveals that NIST has it as well. Again, that is the equation of state for R134a that several computer programs use for property data.
     
  9. Dec 29, 2009 #8
    Sorry about the delay. My question with the MBWR equation of state was determining the Volume from inside the summation. I can't directly solve for it, so I am assuming I need to put it into a guess and check routine until the error falls into an acceptable range?
     
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