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Amélioration des méthodes d'états correspondants étendus pour la modélisation thermodynamique. II. Mélanges.

Enhancement of the extended corresponding states techniques for thermodynamic modelling. II. Mixtures.

Auteurs : SCALABRIN G., MARCHI G., BETTIO L., et al.

Type d'article : Article, Article de la RIF

Résumé

Moving from a former work for pure fluids a new modelling technique has been developed for obtaining a fundamental mixture equation of state in the Helmholtz energy form. This model can be considered an evolution of the extended corresponding states method, which is modified from the conventional analytical mode to a heuristic one through the integration of a general function approximator for the representation of the scale factor functions of a target mixture. The assumed approximator is a multilayer feed forward neural network (MLFN) with two outputs, one for each scale factor. A reference pure fluid, conformal with the components of the studied mixture, is chosen and the independent variables of its dedicated equation of state are distorted by the scale factors, which are individual functions of temperature, density, and composition. The MLFN scale factor functions can be obtained from regression on any kind of thermodynamic data of the target mixture. The model capability to accurately represent the thermodynamic surfaces of five binary and two ternary haloalkane mixtures is studied assuming data generated from the corresponding dedicated equations of state. The obtained prediction accuracies for the mixture thermodynamic properties are competitive with those of the available conventional dedicated equations of state. The proposed modelling technique is then robust and straightforward for the effective development of a mixture DEoS from thermodynamic quantities distributed in the range of interest. See also this Bulletin, reference 2006-2234.

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Pages : 1195-1207

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    20 €

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Détails

  • Titre original : Enhancement of the extended corresponding states techniques for thermodynamic modelling. II. Mixtures.
  • Identifiant de la fiche : 2006-2233
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 29 - n. 7
  • Date d'édition : 11/2006

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