This article is about the purpose of thermodynamic modelling and the relevant procedure. For the details of different models, see Equation of state.
Thermodynamic modelling is a set of different strategies that are used by engineers and scientists to develop models capable of evaluating different thermodynamic properties of a system. At each thermodynamic equilibrium state of a system, the thermodynamic properties of the system are specified. Generally, thermodynamic models are mathematical relations that relate different state properties to each other in order to eliminate the need of measuring all the properties of the system in different states.[1]
The easiest thermodynamic models, also known as equations of state, can come from simple correlations that relate different thermodynamic properties using a linear or second-order polynomial function of temperature and pressures. They are generally fitted using experimental data available for that specific properties. This approach can result in limited predictability of the correlation and as a consequence it can be adopted only in a limited operating range.
By contrast, more advanced thermodynamic models are built in a way that can predict the thermodynamic behavior of the system, even if the functional form of the model is not based on the real thermodynamic behaviour of the material. These types of models contain different parameters that are gradually developed for each specific model in order to enhance the accuracy of the evaluating thermodynamic properties.[2]
^Poling, Bruce E.; Prausnitz, John M.; O'Connell, John P. (2001). The properties of gases and liquids. McGraw-Hill international editions Chemical engineering series (5 ed.). New York, NY: McGraw-Hill. ISBN 978-0-07-011682-5.
^Kontogeorgis, Georgios M.; Folas, Georgios K. (2010). Thermodynamic models for industrial applications: from classical and advanced mixing rules to association theories. Chichester: Wiley. ISBN 978-0-470-69726-9.
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