Int. J. Simul. Multisci. Des. Optim.
Volume 6, 2015
|Number of page(s)||8|
|Published online||29 September 2015|
Nonlinear observer to estimate polarization phenomenon in membrane distillation
Process Control Laboratory, Control Engineering Department, Ecole Nationale Polytechnique, 10 avenue Pasteur, Hassan-Badi, 16200
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Accepted: 21 August 2015
This paper presents a bi-dimensional dynamic model of Direct Contact Membrane Desalination (DCMD) process. Most of the MD configuration processes have been modeled as steady-state one-dimensional systems. Stationary two-dimensional MD models have been considered only in very few studies. In this work, a dynamic model of a DCMD process is developed. The model is implemented using Matlab/Simulink environment. Numerical simulations are conducted for different operational parameters at the module inlets such as the feed and permeate temperature or feed and permeate flow rate. The results are compared with experimental data published in the literature. The work presents also a feed forward control that compensates the possible decrease of the temperature gradient by increasing the flow rate. This work also deals with a development of nonlinear observer to estimate temperature polarization inside the membrane. The observer gives a good profile and longitudinal temperature estimations and shows a good prediction of pure water flux production.
Key words: Direct contact membrane distillation / Dynamic modeling / Heat and mass transfer / Unknown input observer / Polarization coefficient / Saline water desalination
© B. Khoukhi et al., Published by EDP Sciences, 2015
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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