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Precise Modelling of Thermophysical Properties

 

At the chair of thermodynamics precise empirical thermodynamic property models  are being developed for pure fluids as well as mixtures for use in process and thermal engineering applications.

 

Equation of State for Mixtures - Description of Complex Combustion Gas Mixtures

The work on equations of state for mixtures is currently focused on the development of a new mixture model for fluid mixtures which are relevant in advanced energy conversion processes (e.g. Fossil-fuel power plants with CO2 capture of compressed air energy storage). This model will be based on the approach used in the GERG-2004 equation of state, developed in this group supervised by em. Prof. Dr.-Ing Wolfgang Wagner.

 

Equations of State Based on Hybrid Data Sets

Beside the conventional experimental property data also molecular simulation data sets can be used for the development of equations of state. Especially for fluids of states which make measurements difficult or even impossible the simulated data become interesting. At the same time by comparing them with equations of states of well known fluids the molecular models can be improved.

 

Modeling of nucleation with the help of high accuracy equations of state

In general there is a need for describing the effects of nucleation for an investigation of transient thermodynamic processes. This field of research offers answers more qualitatively, rather than accurate.

 

Calculation of complex phase equilibria using highly accurate fundamental equations

Predicting phase equilibria of CO2 with small impurities of other components (e.g. H2O) is an important task connected with the capture and sequestration of carbon dioxide (CCS). Especially the possible formation of solid phases (dry ice and hydrates) will have to be considered.

 

Associating Fluids (only available in german)

The application of the simultaneously optimized equations of state of high technical accuracy to strongly associating fluids was aim of a research project funded by the DFG. An important role played the combination of SAFT terms in the empirical equations of state.