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Titre du document / Document title

Numerical Simulation and Optimal Design of AGMD-Based Hollow Fiber Modules for Desalination

Auteur(s) / Author(s)

CHENG Li-Hua (1) ; WU Ping-Chung (1) ; JUNGHUI CHEN (1) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) R&D Center for Membrane Technology and Department of Chemical Engineering, Chung-Yuan Christian University, Chung-Li 32023, TAIWAN, PROVINCE DE CHINE

Résumé / Abstract

To improve the permeate flux and to keep the advantage of the high thermal efficiency in air gap membrane distillation (AGMD) for desalination, the optimal design of countercurrent AGMD of the hollow fiber module (AGMD-HF) is proposed. The module is basically composed of hydrophobic porous fiber tubes for feed flow and nonporous tubes for cold flow. The set of mathematical model equations for the entire module is derived from rigorous mass, momentum, and energy balances of both the feed side and the cold side coupled with the simultaneous mass and heat transfer across the membrane. The temperatures across the membrane and along the length of the module are simulated. The sensitivity of the process performance to operating conditions along the fiber length is investigated over a range of temperature and the flow rate. It is found that in the AGMD-HF domain, air/vapor dominates the heat and mass transfer resistances, which are comparable with the available experimental results in the literature. An attempt is then made to adjust the packing density and the surface ratio of the hot porous fibers to the cold nonporous fibers in order to maximize the process performance. Based on the trade-off between productivity and the thermal efficiency under module parameters, optimal design of AGMD-HF using Pareto solutions and the genetic algorithm is finally carried out. The obtained optimal points show that productivity increases considerably at the cost of the higher thermal efficiency with the increase of both packing density of the module and the tube ratio of hot feed fibers to cold fibers, with the latter showing relatively complex effect.

Revue / Journal Title

Industrial & engineering chemistry research    ISSN  0888-5885   CODEN IECRED 

Source / Source

2009, vol. 48, no10, pp. 4948-4959 [12 page(s) (article)] (24 ref.)

Langue / Language

Anglais

Editeur / Publisher

American Chemical Society, Washington, DC, ETATS-UNIS  (1987) (Revue)

Mots-clés anglais / English Keywords

Desalination

;

Hollow fiber

;

Optimal design

;

Numerical simulation

;

Mots-clés français / French Keywords

Dessalement

;

Fibre creuse

;

Conception optimale

;

Simulation numérique

;

Mots-clés espagnols / Spanish Keywords

Desaladura

;

Fibra hueca

;

Concepción optimal

;

Simulación numérica

;

Localisation / Location

INIST-CNRS, Cote INIST : 120 F, 35400018844952.0350

Nº notice refdoc (ud4) : 21491412



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