Density of Saturated Vapor R-134a

[Nugget_Mon]

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

 

[Mech_Engineer]

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.

 

[Nugget_Mon]

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.

 

[Yeti08]

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

 

[Nugget_Mon]

Bump.

 

[Mech_Engineer]

What, our answers weren't good enough? Don't just bump the thread, elaborate what it is you're still looking for :grumpy:

 

[Yeti08]

I guess I must have a subscription at work for the link I provided earlier, but a quick google search reveals that http://www.nist.gov/srd/PDFfiles/jpcrd480.pdf. Again, that is the equation of state for R134a that several computer programs use for property data.

 

[Nugget_Mon]

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?