Article | Proceedings of the 12th International Modelica Conference, Prague, Czech Republic, May 15-17, 2017 | Optimization-friendly thermodynamic properties of water and steam
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Title:
Optimization-friendly thermodynamic properties of water and steam
Author:
Marcus Åberg: Department of Automatic Control, Lund University, Sweden Johan Windahl: Modelon AB, Ideon Science Park, Lund, Sweden Håkan Runvik: Modelon AB, Ideon Science Park, Lund, Sweden Fredrik Magnusson: Department of Automatic Control, Lund University, Sweden
DOI:
10.3384/ecp17132449
Download:
Full text (pdf)
Year:
2017
Conference:
Proceedings of the 12th International Modelica Conference, Prague, Czech Republic, May 15-17, 2017
Issue:
132
Article no.:
051
Pages:
449-458
No. of pages:
10
Publication type:
Abstract and Fulltext
Published:
2017-07-04
ISBN:
978-91-7685-575-1
Series:
Linköping Electronic Conference Proceedings
ISSN (print):
1650-3686
ISSN (online):
1650-3740
Publisher:
Linköping University Electronic Press, Linköpings universitet


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This paper describes the development of an optimization-friendly thermodynamic property model of water and steam that covers liquid, vapor, 2-phase as well as the super-critical region. All equations are at least twice continuously differentiable with respect to all model variables and can be used in dynamic optimization problems solved by efficient derivative-based algorithms. The accuracy has been verified against the industry standard IAPWS 97 and performance and robustness has been tested by solving a trajectory optimization problem where the start-up time of a gas power plant has been minimized while satisfying constraints on temperature gradients, pressure and flows. Simulations of various plant models have also been performed to verify and benchmark the implementation. The results show that the new media can be used in both solving dynamic optimization and simulation problems yielding reliable results. The new media has been integrated into Modelon’s Thermal Power library 1.13.

Keywords: Dynamic optimization Thermodynamic properties Power plant start-up ThermalPower library WaterIF97 Optimica JModelica.org

Proceedings of the 12th International Modelica Conference, Prague, Czech Republic, May 15-17, 2017

Author:
Marcus Åberg, Johan Windahl, Håkan Runvik, Fredrik Magnusson
Title:
Optimization-friendly thermodynamic properties of water and steam
DOI:
http://dx.doi.org/10.3384/ecp17132449
References:
No references available

Proceedings of the 12th International Modelica Conference, Prague, Czech Republic, May 15-17, 2017

Author:
Marcus Åberg, Johan Windahl, Håkan Runvik, Fredrik Magnusson
Title:
Optimization-friendly thermodynamic properties of water and steam
DOI:
http://dx.doi.org/10.3384/ecp17132449
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Last updated: 2017-02-21