Modélisation des propriétés thermodynamique et de transport de l’eau aux états liquide et vapeur

B. Mohammedi, S. Hanini, N. Mellel, M. Boumaza

Abstract


Abstract: In this work, we are interested in the modeling of thermodynamic and transport properties of the water and steam with a wide range of pressure, temperature, enthalpy and entropy using artificial neural networks (ANN). These networks enable us to reproduce, as faithfully as possible, the properties concerned by the study, namely 21 properties in the saturation state, 17 properties for the superheated steam and for the subcooled liquid. These properties are expressed according to pressure and enthalpy or pressure and temperature, a formulation linking otherwise the temperature and enthalpy. The interest of these functions is to allow cover a wide area of use, single and two phase, thermodynamic properties with a single formulation.

Several networks are developed; the average relative error for the least estimated property does not exceed 2%. We then compiled all the networks in a visual application developed under Borland Delphi with an intuitive graphical user interface for greatest ease of use for calculation of water properties.

Résumé : Dans ce travail, nous nous sommes intéressés à la modélisation des propriétés thermodynamique et de transport de l’eau aux états liquide et vapeur avec une large gamme de pression, de température, d’enthalpie et d’entropie au moyen des réseaux de neurones artificiels ANN (Artificial Neural Network). Ces réseaux permettent de reproduire, le plus fidèlement possible, les propriétés concernées par l’étude, à savoir 21 propriétés à l’état de saturation, 17 propriétés pour la vapeur surchauffée et pour le liquide sous-refroidi. Ces propriétés sont exprimées en fonction de la pression et de l’enthalpie ou de la pression et de la température, une formulation reliant par ailleurs la température et l’enthalpie. L’intérêt de ces fonctions est de permettre de couvrir un large domaine d’utilisation, simple et double phase, des propriétés thermodynamiques avec une seule formulation.

Plusieurs réseaux sont développés, dont l’erreur relative moyenne pour la propriété la moins estimée n’excède pas 2 %. Nous avons, ensuite, compilé tous les réseaux dans une application visuelle élaborée sous Borland Delphi avec une interface graphique utilisateur intuitive pour une plus grande facilité d'utilisation pour le calcul des propriétés de l’eau.

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