A consistent use of the Lee–Kesler model

Fluid Phase Equilibria, vol. 612, pp. 114840

Abstract

Accurate thermodynamic models of nonideal fluids are essential tools. Beyond the need for better predictive capabilities, their rigorous, thermodynamically-consistent implementation and use within property calculation workflows are a strict prerequisite to obtain physically meaningful and interpretable results. This article identifies inconsistencies in the original property calculation framework of the well-established Lee-Kesler model and proposes a thermodynamically-consistent, ready-to-use approach. In addition to the theoretical proof and discussion on consistency, a numerical analysis is presented to provide empirical evidence for the theoretical findings. The magnitude of errors are evaluated and depicted within a wide state space, using the example of CO 2 as modeled substance.

Authors 4

1. Maik Gentsch

   Technische Universität Berlin

   Affiliation as printed

   Technische Universität Berlin, Chair of Control, Straße des 17. Juni 135, 10623, Berlin, Germany

2. Moreno Ascani Aachen

   RWTH Aachen University

   Affiliation as printed

   RWTH Aachen University, Process Systems Engineering (AVT.SVT), Forckenbeckstraße 51, 52074, Aachen, Germany

3. Steffi Knorn

   Technische Universität Berlin

   Affiliation as printed

   Technische Universität Berlin, Chair of Control, Straße des 17. Juni 135, 10623, Berlin, Germany

4. Alexander Mitsos corresponding Aachen

   RWTH Aachen University · Forschungszentrum Jülich · Jülich Aachen Research Alliance

   Affiliation as printed

   Forschungszentrum Jülich GmbH, Institute of Climate and Energy Systems ICE-1: Energy Systems Engineering, Wilhelm-Johnen-Straße, 52428, Jülich, Germany

   JARA-Energy, Aachen, Germany

   RWTH Aachen University, Process Systems Engineering (AVT.SVT), Forckenbeckstraße 51, 52074, Aachen, Germany