help with lee-kesler equation 1

[newz2]

Hello,

I am trying to use the Lee-Kesler equation. As I understand, we need to solve for Z (or Vr) first using the equation once for a simple fluid and then for a reference fluid. This euqation contains Z terms upto 5 th order along with an exponential term. Do we solve for Z by finding the root of the equation? If yes, any idea on how to find the roots of a equation with an exponential term in it?

I need to solve for Z using a computer program, so I cannot use the tables in Polling et al. book. Does any one have a sample code?

Thanks very much in advance.

 

[ione]

Try this to solve quintic equation

http://www.freewebs.com/brianjs/quinticequationcalculator.htm

 

[PaoloPemi]

If you need to code a little procedure you may consider books as Daubert's Chemical Engineering Thermodynamics which includes a Fortran example, with Google you may find several Excel pages showing how to solve LK (usually by iterating -Newton or similar method- on density) and some sourceforge projects (see for example DWSIM) which may explain some details.
If you wish to do something more complex do not forget that solving the model (LK or another equation) is only a little step toward the defintion of reliable flash operations which may require a considerably larger effort.

 

[jmw]

A quick google found this:

http://www.macatea.com/wshop/lk/

which is a Lee Kesler solver..... is this what is needed? It has a bit of a description with it.

JMW

http://www.ViscoAnalyser.com