Filters








4,267 Hits in 8.2 sec

Feedback control for distributed heat transfer mechanisms in direct-contact membrane distillation system

Fadi Eleiwi, Ibrahima N'Doye, Taous-Meriem Laleg-Kirati
2015 2015 IEEE Conference on Control Applications (CCA)  
In this paper, the problem of stabilization and production rate reference tracking for a Direct-Contact Membrane Distillation (DCMD) system is addressed.  ...  Index Terms-Direct-Contact Membrane Distillation (DCMD), feedback stabilization, reference output tracking, static state feedback, observers design, observer based output feedback, LMIs.  ...  The most popular configuration for MD is Direct-Contact Membrane Distillation (DCMD), where both the feed and permeate solutions are in direct contact with the membrane sides.  ... 
doi:10.1109/cca.2015.7320842 dblp:conf/IEEEcca/EleiwiNL15 fatcat:xrldhmeqw5e7vj7uaevhlfvmg4

A feedback control system with reference governor for a solar membrane distillation pilot facility

Juan D. Gil, Lidia Roca, Guillermo Zaragoza, Manuel Berenguel
2018 Renewable Energy  
This work presents the development of a feedback control system for a pilot membrane distillation facility powered with solar energy located at Plataforma Solar de Almería (PSA), Spain.  ...  Four direct control schemes based on Proportional Integral (PI) controllers and Feedforward (FF) are designed as well as a reference governor which generates temperature references for the heat generation  ...  In [12] steady-state simulations, using a wide range of operating conditions, were carried out for a direct contact mem-30 brane distillation system.  ... 
doi:10.1016/j.renene.2017.12.107 fatcat:rtyp63fvwfaorff6ueg5kk6nae

Membrane Distillation Process Modeling: Dynamical Approach

Fadi Eleiwi, Taous Meriem Laleg-Kirati
2014 Zenodo  
System performance and parameters can be optimized and controlled using this complete dynamic model.  ...  A 2D advection-diffusion equation for modeling the whole process and a modified heat equation for modeling the membrane itself.  ...  Noreddine Ghaffour and Water desalination and reuse center (WDRC) in KAUST for timely and useful discussion during the process of this work.  ... 
doi:10.5281/zenodo.1093114 fatcat:dx7novto3zhqjofkasrreypvay

State observer design for Direct Contact Membrane Distillation Parabolic systems

Mohamed Ghattassi, Jean-Claude Vivalda, Taous Meriem Laleg-Kirati
2018 2018 Annual American Control Conference (ACC)  
This paper proposes a state observer for a coupled two dimensional partial differential equations (PDEs) system used to describe the heat transfer in a membrane distillation system for water desalination  ...  The mathematical model based on reaction-diffusion system is introduced. Sufficient conditions for the exponential convergence of the estimation error is presented using Lyapunov method.  ...  The estimation performance is illustrated through a numerical example in Section 4. II. DIRECT CONTACT MEMBRANE DISTILLATION SYSTEM A.  ... 
doi:10.23919/acc.2018.8431155 dblp:conf/amcc/GhattassiVL18 fatcat:mubsjtjhz5ai5hcl7gvwujxts4

DISTILLATION | Historical Development [chapter]

M.S. Ray
2000 Encyclopedia of Separation Science  
Many other examples of membrane}distillation systems can be found in the literature.  ...  ), and hybrid systems of membranes (or other techniques) with distillation. 2.  ... 
doi:10.1016/b0-12-226770-2/04721-9 fatcat:ppjcalt6jndj7h7eedlkn5j2ly

Industrial Membrane Processes for the Removal of VOCs from Water and Wastewater

Hisham A. Maddah
2019 International Journal of Engineering and Applied Sciences (IJEAS)  
Emerging membrane technologies such as pervaporation (PV) and membrane distillation (MD) gained scientists' attention as a promising way for water treatment.  ...  and vacuum membrane distillation (VMD).  ...  Childress (from the University of Southern California) for her invaluable feedback and discussions during the MS coursework which greatly refined the research work.  ... 
doi:10.31873/ijeas/6.4.2019.09 fatcat:e4ctjrlprjblnalpqimghneo6q

Process intensification

Frerich J. Keil
2018 Reviews in chemical engineering  
Its tools are reduction of the number of devices (integration of several functionalities in one apparatus), improving heat and mass transfer by advanced mixing technologies and shorter diffusion pathways  ...  Starting from fundamental definitions, microfluidic technology, mixing, modern distillation techniques, membrane separation, continuous chromatography, and application of gravitational, electric, and magnetic  ...  Fieg (TU Hamburg) for reading this paper and their useful comments. The author is also grateful to Mrs. H. Oppelaar for writing the text and preparing the figures.  ... 
doi:10.1515/revce-2017-0085 fatcat:46l2im4425bclj774qfcfqr5hu

Thermodynamic Design and Fouling of Membrane Distillation Systems [article]

David M Warsinger
2017 arXiv   pre-print
One such developing technology, membrane distillation (MD), has experienced keen academic interest and an increase in start-up businesses in the past decade.  ...  The aim of this research is to better understand and provide solutions for two major challenge areas for MD: efficiency and membrane fouling.  ...  Several configurations have been designed for MD, including the most commonly, Direct Contact Membrane Distillation (DCMD) and Air Gap Membrane Distillation (AGMD), as well as Vacuum Membrane Distillation  ... 
arXiv:1711.07348v1 fatcat:sdrv56jjlbfm3hamynjky2ppey

Influence of inlet pressure and geometric variations on the applicability of Eductor in low temperature thermal desalinations

Ravi Koirala, Quoc Linh Ve, Abhijit Date, Kiao Inthavong, Aliakbar Akbarzadeh
2021 Journal of King Saud University: Engineering Sciences  
This paper explores the potential of water jet eductor to replace large condensers and vacuum pump in the thermal desalination systems, with heat source temperatures below 95°C.  ...  The operational limit of eductor has been investigated for active vapor transport and condensation to produce permeate.  ...  In an Eductor, at low pressure zone of primary fluid passage, secondary fluid entrains, and subsequently direct contact heat and mass transfer occurs.  ... 
doi:10.1016/j.jksues.2021.03.012 fatcat:rjqfpecy5nhmvbjmxvungyhwty

Optimal operation of a Solar Membrane Distillation pilot plant via Nonlinear Model Predictive Control

Juan D. Gil, Lidia Roca, Alba Ruiz-Aguirre, Guillermo Zaragoza, Manuel Berenguel
2018 Computers and Chemical Engineering  
In this paper, a hierarchical control system composed by two layers is used for optimizing the operation of a SMD pilot plant, in terms of thermal efficiency, distillate production and cost savings.  ...  The lower layer includes a direct control system, in charge of attaining the variable references provided by the upper layer.  ...  The most 85 adopted configurations are Direct Contact Membrane Distillation (DCMD), Permeate Gap Membrane Distillation (PGMD) and AGMD, in which condensation takes place inside the module, and Sweeping  ... 
doi:10.1016/j.compchemeng.2017.11.012 fatcat:ivc4r7jbmfe77ezl4j3ylorjlu

Solar-assisted membrane technology for water purification: a review

Tsegahun Mekonnen Zewdie, Nigus Gabbiye Habtu, Abhishek Dutta, Bart Van der Bruggen
2020 Journal of Water Reuse and Desalination  
osmosis, electrodialysis, membrane distillation, and hybrid membrane systems.  ...  Membrane-based water purification technologies play a major role in water purification by utilization of low-cost heat sources to make the process economically and technically viable for small, medium,  ...  to the KU Leuven and Bahir Dar University, Bahir Dar Institute of Technology, for providing necessary resources and support for this review paper.  ... 
doi:10.2166/wrd.2020.049 fatcat:qv6pjk3csnawtkyoutt5vzwwne

Degrees of freedom of equipment and processes

Q.T. Pham
1994 Chemical Engineering Science  
Simple equations are derived to carry out degree of freedom analyses quickly and almost mechanically, using easily countable physical entities.  ...  It is shown that the outlet stream freedom does not depend on the number of component substances, and in many cases not on the number of phases.  ...  Heat transfer may be direct via a heat exchanger, or indirect via any number of intermediate fluids.  ... 
doi:10.1016/0009-2509(94)e0056-v fatcat:g63uuuyqnfcz7jzlleyf3i3hwe

Recent Developments in Solar Thermal Desalination Technologies: A Review

Ihsan Ullah, Mohammad Rasul
2018 Energies  
Fresh water resources are also not equally distributed geographically worldwide.  ...  The best way to tackle this situation is to use solar energy for desalination to not only cater for the water needs of humanity, but also to offset some detrimental environmental effects of desalination  ...  his contribution in proof reading the manuscript.  ... 
doi:10.3390/en12010119 fatcat:5tnqwb4ajzhbziziicr4u2sw7u

Experimental and theoretical analyses of temperature polarization effect in vacuum membrane distillation

Ahmad S. Alsaadi, Lijo Francis, Gary L. Amy, Noreddine Ghaffour
2014 Journal of Membrane Science  
The coupling between heat and mass transfer mechanisms at the feed-membrane interface is presented from a theoretical point of view.  ...  The main motivation for using VMD in this work is that this module configuration is much simpler and more suitable for this kind of investigation than the other MD configurations such as Direct Contact  ...  They studied the temperature polarization effect in direct contact membrane distillation (DCMD) configuration, evaluated the relative effect of temperature and concentration polarizations on MD flux, introduced  ... 
doi:10.1016/j.memsci.2014.08.005 fatcat:b5tdj2hstvfmveeu6rmber5ol4

Optimal Control of Direct Contact Membrane Distillation Operated under Fluctuating Energy Source

Emad Ali
2022 Membranes  
An optimal control strategy was tested to regulate the flow rate of the cold stream to maximize the time-averaged water production of a laboratory-scale membrane distillation (MD) process.  ...  By modifying the control strategy to adapt the membrane length in addition to the flow rate of the cold stream, highly improved performance could be obtained.  ...  In other words, adjustment of the heat and mass transfer was ineffective for a long membrane with a low flow rate ratio.  ... 
doi:10.3390/membranes12060628 pmid:35736335 pmcid:PMC9230371 fatcat:imdcm4trnner3oi4r6wrstzyla
« Previous Showing results 1 — 15 out of 4,267 results