Lee Kesler Spreadsheet

[MatthewD]

I have been trying to create a spreadsheet to come up with residual properties via Lee-Kesler EOS I have however hit a snag. In Lee-Keslers paper he describes a term Vr=Pc*V/Tc*R where V is the volume of a simple fluid. The paper I am refering to is called "A Generalized thermodynamic Correlation Based on Three-Parameter Corresponding States". And I could REALLY use some advice

 

[owg]

I hope this is helpful. Lee and Kesler are separate people. Mike Kesler is associated with Kesler Engineering in NJ. Check out Kesler Engineering on the web and contact them. Just don't ask for Lee Kesler, it is not a good way to start the conversation. Good luck.

HAZOP at

http://www.curryhydrocarbons.ca

 

[DickRussell]

What do you mean by "snag?" How far have you gone with the implementation, and what specifically do you need to know at this point?

For another reference, see Chapter 7 of the API Technical Data Book, Hydrocarbons. This covers thermal properties, and the LK procedure for dH and dS is described well in there.

 

[MatthewD]

Well I want my program to be able to calculate Lee-kesler values based off the Tc and Pc alone irregardless of the sitiuation. It seems to me like a value such as V in the aformentioned equation is a specific value dependent on your conditions but if that is the case how do people use the Lee Kesler tables and graphs irrespective of there fluid volume our conditions

 

[Latexman]

The Lee-Kesler EOS is a three parameter correlation, in addition to Tc and Pc, you'll need the acentric factor for the fluid of interest.

First, determine the ideal reduced volume of the Lee-Kesler "simple fluid" (w = 0) using the Tr and Pr of the fluid of interest. Calculate the simple fluid compressibility (Zsf = PrVr/Tr).

Second, determine the ideal reduced volume of the Lee-Kesler "reference fluid" (n-octane, whose w = 0.3978) using the same Tr and Pr of the fluid of interest. Calculate the reference fluid compressibility (Zrf = PrVr/Tr).


Lastly, find the compressibility of the fluid of interest by interpolation/extrapolation based on the acentric factor of the fluid of interest. [Z = Zsf + (w/0.3978) x (Zrf - Zsf)]

The 3rd Ed. of Sherwood, Reid, and Prausnitz has all the equations and tables you need.


Good luck,
Latexman

 

[Latexman]

The thermodynamic departure functions are treated similarly.

Good luck,
Latexman