than 25 years the Chair of Thermodynamics at Ruhr-Universitšt
Bochum has dealt with research in the field of thermodynamic
properties of fluid substances. Besides a number of
highly accurate equations of state, which in many cases,
have been considered as international references for
the properties of the corresponding substance, an extensive
set of algorithms for the calculation of thermodynamic
properties from equations of state formulated in terms
of the Helmholtz energy have resulted from this work.
software packages have been developed during the past
years, to make this modern way of easily calculating
thermodynamic properties available for users in industry
and research. These packages are customized for every
individual field of application.
FLUIDCAL for the calculation of thermodynamic properties
for a great number of substances
Software components are available
for over 70 substances, with which thermodynamic properties
can be calculated easily and accurately.
for the IAPWS-95 Formulation
comprehensive software package has been developed for
the calculation of thermodynamic properties of water
based on the scientific standard equation of state IAPWS-95.
program for the calculation of thermodynamic properties
fort the substances covered by FLUIDCAL. The program
also allows drawing diagrams of state.
for the Industrial Formulation IAPWS-IF97
An extensive software package has
been developed for the calculation of thermodynamic
properties of water and steam based on the industrial
formulation IAPWS-IF97. This package allows the user
to apply the new industrial standards for the calculation
of power plants or different technical applications
in an easy way.
for the reference equation of state GERG-2008 for natural
gases and other mixtures
the reference equation of state GERG-2008, a comprehensive
and userfriendly software package is available. The
software enables to calculate several thermodynamic
properties in the homogeneous gas, liquid, and supercritical
regions and allows to carry out VLE calculations at
arbitrary mixture conditions where the prior knowledge
of the number of phases (one or two) is not required.
The VLE calculation options include different flash
options as well as phase envelope, dew point, and bubble