The Experts below are selected from a list of 10545 Experts worldwide ranked by ideXlab platform
Chengliang Chang - One of the best experts on this subject based on the ideXlab platform.
-
modeling and optimization of a solar driven Membrane Distillation desalination system
Renewable Energy, 2010Co-Authors: Hsua Chang, Gowbi Wang, Yihhang Che, Chengliang ChangAbstract:The desalination technology using Membrane Distillation driven by solar energy is a feasible solution for reducing the energy cost. A dynamic simulation model for a solar driven Membrane Distillation desalination system (SMDDS) is developed on the Aspen Custom Modeler® (ACM) platform for the system performance and optimization study. The rigorous model for the spiral-wound air gap Membrane Distillation (SP-AGMD) module takes into account the heat and mass transfer resistances associated with each composing layer. The effects of adopting different objective functions, solar radiation conditions, thermal storage tank configurations, as well as the flowrates of the Membrane Distillation module and the thermal storage tank on the optimized performance are reported. Simple thermal storage tank and lower flowrate of the Membrane Distillation module are advantageous to higher water production rate. A control system using conventional PI (Proportional/Integral) controllers is proposed and the water production rate can reach about 87% of the optimal result for clear sky operation.
Hsua Chang - One of the best experts on this subject based on the ideXlab platform.
-
modeling and optimization of a solar driven Membrane Distillation desalination system
Renewable Energy, 2010Co-Authors: Hsua Chang, Gowbi Wang, Yihhang Che, Chengliang ChangAbstract:The desalination technology using Membrane Distillation driven by solar energy is a feasible solution for reducing the energy cost. A dynamic simulation model for a solar driven Membrane Distillation desalination system (SMDDS) is developed on the Aspen Custom Modeler® (ACM) platform for the system performance and optimization study. The rigorous model for the spiral-wound air gap Membrane Distillation (SP-AGMD) module takes into account the heat and mass transfer resistances associated with each composing layer. The effects of adopting different objective functions, solar radiation conditions, thermal storage tank configurations, as well as the flowrates of the Membrane Distillation module and the thermal storage tank on the optimized performance are reported. Simple thermal storage tank and lower flowrate of the Membrane Distillation module are advantageous to higher water production rate. A control system using conventional PI (Proportional/Integral) controllers is proposed and the water production rate can reach about 87% of the optimal result for clear sky operation.
M P Godino - One of the best experts on this subject based on the ideXlab platform.
-
heat and mass transfer in vacuum Membrane Distillation
International Journal of Heat and Mass Transfer, 2004Co-Authors: J I Mengual, M Khaye, M P GodinoAbstract:Abstract In the Membrane Distillation (MD) literature, the heat transfer coefficients of the boundary layers are usually estimated from well known heat transfer empirical correlations developed for non-porous and rigid heat exchangers. A difference between the mechanism of heat transfer in MD systems, which is coupled with transMembrane mass transfer, and the mechanism of heat transfer in “pure” heat exchangers is expected to exist. Vacuum Membrane Distillation has been experimentally studied in a capillary Membrane module and the heat transfer coefficients have been evaluated in both the lumen and the shell side of the Membrane module. A critical review of the most frequently used heat transfer empirical correlations in MD systems is presented. Finally, the experimental results obtained in this paper are compared to those of literature, in order to test their applicability in Membrane Distillation systems.
-
Possibility of nuclear desalination through various Membrane Distillation configurations: a comparative study
International Journal of Nuclear Desalination, 2003Co-Authors: Mohamed Khayet, M P Godino, J I MengualAbstract:Three Membrane Distillation processes, direct contact Membrane Distillation, sweeping gas Membrane Distillation and vacuum Membrane Distillation, have been experimentally studied in a shell-and-tube capillary Membrane module. Preliminary experiments were conducted using distilled water and sodium chloride aqueous solutions as feed. The effects of the operating parameters - flow rate, temperature and salt concentration - have been investigated. A theoretical analysis that considers the heat and mass transfer through microporous hydrophobic Membrane has been developed. A comparative study was made between the three Membrane Distillation configurations. Membrane Distillation can be an alternative for liquid nuclear waste treatment.
-
Water production from brines by Membrane Distillation
Desalination, 1997Co-Authors: M P Godino, L. Peña, C. Rincón, J I MengualAbstract:The possibility of obtaining pure water by Membrane Distillation, from brines rejected in other water production operations has been considered. Membrane Distillation experiments have been carried out by using two PTFE porous hydrophobic Membranes and sodium chloride aqueous solutions, within a wide range of solute concentrations. The influence of stirring rate, mean temperature and salt concentration on the fluxes has been estimated. The results suggest that a cooperation of Membrane Distillation and solar Distillation techniques may be fruitful.
M Khaye - One of the best experts on this subject based on the ideXlab platform.
-
vacuum Membrane Distillation
Membrane Distillation#R##N#Principles and Applications, 2011Co-Authors: M Khaye, Takeshi MatsuuraAbstract:Vacuum Membrane Distillation (VMD) configuration is described in details in this chapter showing its advantages and drawbacks. Theoretical models and experimental studies are reviewed. Heat and mass transfer phenomena, temperature and concentration polarization, the effects of the operating parameters on the VMD performance and a number of VMD applications are reported. Finally, similarity and differences between VMD and pervaporation (PV) are discussed.
-
application of vacuum Membrane Distillation for ammonia removal
Journal of Membrane Science, 2007Co-Authors: M S Elbourawi, M Khaye, Zhongwei Ding, Xiaowei ZhangAbstract:This study aims to investigate the applicability of Membrane Distillation for ammonia removal from its aqueous solutions. Among the different recognized Membrane Distillation configurations, vacuum Membrane Distillation is applied in the present work for ammonia removal. The effects of different operating parameters on ammonia removal from aqueous solutions of different concentrations have been investigated. Experimental results showed that high feed temperatures, low downstream pressures and high initial feed concentrations and pH levels enhance ammonia removal efficiency. The pH is found to be the most dominant factor. Temperature and concentration polarizations within feed boundary layer proved to have a significant influence on mass transport. High feed flow velocity is an important tool diminishing temperature and concentration polarizations effects. The resistance to mass transfer is found to switch from being predominantly located in the feed side at low feed temperatures and flow velocities to be nearly located within the Membrane pores at 55.7 °C and reasonably higher feed flow velocity of 0.84 m/s. Although high feed temperatures and low downstream pressures increase remarkably the total transMembrane flux and the ammonia removal rate, the corresponding ammonia separation factors were decreased. Ammonia removal efficiencies higher than 90% with separation factors of more than 8 were achieved in this study.
-
heat and mass transfer in vacuum Membrane Distillation
International Journal of Heat and Mass Transfer, 2004Co-Authors: J I Mengual, M Khaye, M P GodinoAbstract:Abstract In the Membrane Distillation (MD) literature, the heat transfer coefficients of the boundary layers are usually estimated from well known heat transfer empirical correlations developed for non-porous and rigid heat exchangers. A difference between the mechanism of heat transfer in MD systems, which is coupled with transMembrane mass transfer, and the mechanism of heat transfer in “pure” heat exchangers is expected to exist. Vacuum Membrane Distillation has been experimentally studied in a capillary Membrane module and the heat transfer coefficients have been evaluated in both the lumen and the shell side of the Membrane module. A critical review of the most frequently used heat transfer empirical correlations in MD systems is presented. Finally, the experimental results obtained in this paper are compared to those of literature, in order to test their applicability in Membrane Distillation systems.
Tian Rui - One of the best experts on this subject based on the ideXlab platform.
-
Research of solar driven Membrane Distillation desalination system
Membrane Science and Technology, 2011Co-Authors: Tian RuiAbstract:In the background of energy shortage and water scarcity,It becomes an important water treatment technology for solar-powered Membrane Distillation system to desalinate the sea water or brackish water.To improve the flux of Membrane Distillation,a rotary tangential inflow method is used to enhance the mass transfer process,and its numerical simulation and mechanism study have done.Membrane module structure in the air gap Membrane Distillation system has been further improved,its flux is close to the original Membrane module,but it is easy to manufacture and can be used in combination with a variety of ways.To improve the performance of solar water heating system,experimental study of collector properties has been carried out.And three-dimensional numerical simulation for all-glass vacuum tube solar collector system has been done by software FLUENT.Experimental results show that solar powered Membrane Distillation can work safely all day in summer of Huhhot.
-
Experimentation and mathematical modeling of solar Membrane Distillation
Journal of Dalian Maritime University, 2010Co-Authors: Tian RuiAbstract:The air gap Membrane Distillation experiments under conditions of different temperature and working fluid flux were done by using solar power as driven-energy.The mathematical model of heat transfer and mass transfer of Membrane Distillation was established,and the correctness of the mathematical model was discussed and the thermal efficiency of Membrane Distillation system was calculated.Results show that the proposed model is reliable which can be used to forecast the flux of Membrane Distillation under different experiment conditions.The Membrane Distillation system has higher thermal efficiency under conditions of higher temperature and more working fluid flux.