Reduced volume in Lee Kesler EOS

[Whelp]

I’ve been trying to implement the Lee-Kesler EOS in a spreadsheet but my results are inconsistent with tabulated values. The correlations are given in terms of the reduced volume Vr which I calculate as Vr=Tr/Pr. Is that correct?

 

[Latexman]

No. Think ideal gas law. Vr=nRTr/Pr or with V on a molar basis it is Vr=RTr/Pr.

Good luck,
Latexman

 

[Latexman]

Sorry, I'm travelling and don't have my references. Vr=V/(RTc/Pc).

Good luck,
Latexman

 

[Whelp]

My reasoning in not including the gas constant R was that if PV = RT and PcVc = RTc then by dividing the two equations one gets PrVr=Tr. But apparently, Vr is not defined the same way as Tr and Pr are.

 

[PaoloPemi]

you should read a good textbook, see for example "Chemical engineering thermodynamics" by Daubert which includes also the Fortran code.