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The popular web-site for Chemical Engineers: 'Chemical
Engineering with
Dr.Bernhard
Spang' has thanked us for supplying
information that helped them correct some errors in the materials
available from their web site. Specifically: the derivation and
calculation of thermodynamic partial-derivatives for calculating the
Thermal Conductivity of steam. The article is available here:
http://chemengineer.about.com/library/weekly/aa082800a.htm
Background
Chemical Engineering with
Dr.Bernhard
Spang has several library articles
describing IAPWS equations for calculating the properties of water and
steam, which include the calculation of Thermal Conductivity. As well as
the articles, software is available for download as an add-in for
Microsoft Excel.
The IAPWS
equations for calculating thermal conductivity require the calculation of
two partial derivatives of thermodynamic properties; but no guidance is
given by IAPWS on how to derive these
properties from the basic IAPWS
equations. The derivation requires a knowledge of thermodynamics and
calculus.
While developing independently the calculations for our own product Water
& Steam, Thermophysical Properties for MATLAB, we were unable to
obtain agreement between our own mathematical derivations and numerical
results, and those obtainable from methods at the Chemengineer
site.
We are happy to have been able to forward to Dr.Spang copies of our
development of the thermodynamic relationships that have enabled an update
of the material available at the the Chemengineer
site.
More Information
03 January 2008
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