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Jim Glass
Posted: Tue Dec 30, 2003 10:58 pm
Guest
I have a pamphlet from the Chlorine Institute, published in 1986, which
contains equation of state and other data on chlorine.

I'm attempting to code it up to develop a module which will return all important
thermodynamic properties (density, enthalpy, entropy) for saturated,
superheated, and two-phase chlorine.

I am experiencing significant difficulties; the document appears to be rife with
errors. In particular:

(1) Inconsistent definition of variables. For example, "k" is given
as 5.0 in one place and the Boltzman constant in others.
(2) Vref is never defined, but is used in the equations.
(3) Some variables are defined and never used(!)
(4) The equation of state will not solve correctly using the reduced
volume at the reference state. A six-percent change in reduced volume
results in enormous variations in Pr.
(5) An innocent little statement contains a world of agony. I quote:
"5.1 Specific Volume of Saturated Vapor. This was obtained IMPLICITLY
from the equation of state by substituting values of T and P which
satisfy the vapor pressure equation." (page 12). Oh yeah? Show me
how. Without this no further calculations can be made, and (4) above
prevents me from doing this. Something is screwy somewhere in
chlorine land.

I wonder if anyone has:
- An alternate source for Chlorine properties
- A working code (preferably in Fortran) for chlorine properties
- Ever worked with this document and resolved the problems with it

Thanks in advance. Reply to:
jglass@nospam.socal.rr.com (leave out the "nospam")
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Allan Harvey
Posted: Wed Dec 31, 2003 7:38 pm
Guest
Jim Glass wrote:
Quote:
I wonder if anyone has:
- An alternate source for Chlorine properties
- A working code (preferably in Fortran) for chlorine properties
- Ever worked with this document and resolved the problems with it

There was an equation of state developed for Cl2 about 20 years ago for an
IUPAC project, published in one of their "Thermodynamic Tables of the Fluid
State" books. It was considered "preliminary" or "provisional" or some such,
probably due to lack of data, but I don't think it has been improved since.

For best-avaiable pure-fluid equations of state, the 2 sources to try first are
NIST and the group of Prof. Wagner at Bochum. It looks like NIST doesn't have
this particular fluid in their offerings, but the software described at:
http://www.ruhr-uni-bochum.de/thermo/Software/Seiten/Fluidcal-eng.htm
might meet your needs.

--------------------------------------------------------------
Dr. Allan H. Harvey, Boulder, CO
"Any opinions expressed are mine, and should not be attributed to
my employer, my wife, or my cats."
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Jim Glass
Posted: Wed Dec 31, 2003 10:40 pm
Guest
Thank you. I have written Prof. Wgner. I suspect he is selling his code
commercially and that the price will be too much for me to afford, but I shall
wait and see.

JG

In article <20031231193819.19816.00001560@mb-m01.aol.com>,
steamdoc@aol.com.org123 says...
Quote:


Jim Glass wrote:
I wonder if anyone has:
- An alternate source for Chlorine properties
- A working code (preferably in Fortran) for chlorine properties
- Ever worked with this document and resolved the problems with it

There was an equation of state developed for Cl2 about 20 years ago for an
IUPAC project, published in one of their "Thermodynamic Tables of the Fluid
State" books. It was considered "preliminary" or "provisional" or some such,
probably due to lack of data, but I don't think it has been improved since.

For best-avaiable pure-fluid equations of state, the 2 sources to try first
are
NIST and the group of Prof. Wagner at Bochum. It looks like NIST doesn't
have
this particular fluid in their offerings, but the software described at:
http://www.ruhr-uni-bochum.de/thermo/Software/Seiten/Fluidcal-eng.htm
might meet your needs.

--------------------------------------------------------------
Dr. Allan H. Harvey, Boulder, CO
"Any opinions expressed are mine, and should not be attributed to
my employer, my wife, or my cats."
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