Article | Proceedings of the 11th International Modelica Conference, Versailles, France, September 21-23, 2015 | Fundamental EoS Implementation for {Water+Ammonia} in Modelica
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Title:
Fundamental EoS Implementation for {Water+Ammonia} in Modelica
Author:
Leonard Becker: Department of Energy Engineering, Technische Universität Berlin, Germany José Luis Corrales Ciganda: Department of Energy Engineering, Technische Universität Berlin, Germany
DOI:
10.3384/ecp15118647
Download:
Full text (pdf)
Year:
2015
Conference:
Proceedings of the 11th International Modelica Conference, Versailles, France, September 21-23, 2015
Issue:
118
Article no.:
069
Pages:
647-652
No. of pages:
6
Publication type:
Abstract and Fulltext
Published:
2015-09-18
ISBN:
978-91-7685-955-1
Series:
Linköping Electronic Conference Proceedings
ISSN (print):
1650-3686
ISSN (online):
1650-3740
Publisher:
Linköping University Electronic Press, Linköpings universitet


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The implementation of a library for the calculation of thermodynamic properties for the mixture {water + ammonia} based on a fundamental equation of state (EoS) for the Helmholtz free energy is developed and presented. The model uses the formulation of Tillner-Roth and Friend (1998) in order to provide the best available single state thermodynamic data. The calculation of the vapour-liquid equilibrium (VLE) with the aid of the fundamental equation of state is examined. However due to difficulties found under certain pressure and temperature conditions, another method for calculating the VLE had to be used. The problems found included unreliable results and difficulties setting the initial values. Saturation temperature polynomials by Johnson (2001) have been found to be faster and more reliable and have been implemented instead. In result it’s possible to calculate thermophysical properties in single and two-phase region at pressures from the melting point up to 40 MPa.

Keywords: Ammonia + Water; fundamental EOS; thermodynamic properties; Helmholtz energy

Proceedings of the 11th International Modelica Conference, Versailles, France, September 21-23, 2015

Author:
Leonard Becker, José Luis Corrales Ciganda
Title:
Fundamental EoS Implementation for {Water+Ammonia} in Modelica
DOI:
http://dx.doi.org/10.3384/ecp15118647
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Proceedings of the 11th International Modelica Conference, Versailles, France, September 21-23, 2015

Author:
Leonard Becker, José Luis Corrales Ciganda
Title:
Fundamental EoS Implementation for {Water+Ammonia} in Modelica
DOI:
http://dx.doi.org/10.3384/ecp15118647
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