Membrane distillation regeneration of liquid desiccant solution for air-conditioning: Insights into polarisation effects and mass transfer

Duong, HC; Ansari, AJ; Cao, HT; Nguyen, NC; Do, KU; Nghiem, LD

Membrane distillation regeneration of liquid desiccant solution for air-conditioning: Insights into polarisation effects and mass transfer

Duong, HC Ansari, AJ Cao, HT Nguyen, NC Do, KU Nghiem, LD

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Publisher:: Elsevier BV
Publication Type:: Journal Article
Citation:: Environmental Technology and Innovation, 2020, 19, pp. 100941-100941
Issue Date:: 2020-08-01

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Field	Value	Language
dc.contributor.author	Duong, HC
dc.contributor.author	Ansari, AJ
dc.contributor.author	Cao, HT
dc.contributor.author	Nguyen, NC
dc.contributor.author	Do, KU
dc.contributor.author	Nghiem, LD
dc.date.accessioned	2021-03-01T20:42:05Z
dc.date.available	2021-03-01T20:42:05Z
dc.date.issued	2020-08-01
dc.identifier.citation	Environmental Technology and Innovation, 2020, 19, pp. 100941-100941
dc.identifier.issn	2352-1864
dc.identifier.issn	2352-1864
dc.identifier.uri	http://hdl.handle.net/10453/146584
dc.description.abstract	© 2020 Membrane distillation (MD) embodies ideal attributes for the regeneration of liquid desiccant solutions used in air-conditioning systems. The MD process has been experimentally proven technically viable for the regeneration of liquid desiccant solutions; however, it suffers severely from temperature and concentration polarisation effects. In this study, for the first time a descriptive mass and heat transfer (DMHT) model is developed to quantitatively describe the mass transfer and the negative impacts of temperature and concentration polarisation during the MD regeneration of the LiCl desiccant solution. The simulation results demonstrate significant reduction in water flux along the membrane due to decreasing mass transfer coefficient (Cm) and transmembrane water vapour pressure gradient (ΔPm). Over the length of the membrane leaf of 0.145 m, water flux reduces by 31% from 11.0 to 7.6 L/m2⋅h. The temperature and concentration polarisation effects cause a substantial decline in the process driving force - ΔPm is only two thirds of the water vapour pressure difference between the bulk feed and distillate (ΔPb). Temperature polarisation is the predominant cause of the reduction in ΔPm compared with ΔPb; however, the negative impact of concentration polarisation is also notable. Finally, amongst the key operating conditions, the inlet feed temperature and concentration exert the most profound influence on the temperature and concentration polarisation during the DCMD regeneration of the hyper saline LiCl solution.
dc.language	en
dc.publisher	Elsevier BV
dc.relation.ispartof	Environmental Technology and Innovation
dc.relation.isbasedon	10.1016/j.eti.2020.100941
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0502 Environmental Science and Management, 0907 Environmental Engineering, 1002 Environmental Biotechnology
dc.title	Membrane distillation regeneration of liquid desiccant solution for air-conditioning: Insights into polarisation effects and mass transfer
dc.type	Journal Article
utslib.citation.volume	19
utslib.for	0502 Environmental Science and Management
utslib.for	0907 Environmental Engineering
utslib.for	1002 Environmental Biotechnology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Strength - CTWW - Centre for Technology in Water and Wastewater Treatment
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney
utslib.copyright.status	closed_access	*
dc.date.updated	2021-03-01T20:42:03Z
pubs.publication-status	Published
pubs.volume	19

Abstract:

© 2020 Membrane distillation (MD) embodies ideal attributes for the regeneration of liquid desiccant solutions used in air-conditioning systems. The MD process has been experimentally proven technically viable for the regeneration of liquid desiccant solutions; however, it suffers severely from temperature and concentration polarisation effects. In this study, for the first time a descriptive mass and heat transfer (DMHT) model is developed to quantitatively describe the mass transfer and the negative impacts of temperature and concentration polarisation during the MD regeneration of the LiCl desiccant solution. The simulation results demonstrate significant reduction in water flux along the membrane due to decreasing mass transfer coefficient (Cm) and transmembrane water vapour pressure gradient (ΔPm). Over the length of the membrane leaf of 0.145 m, water flux reduces by 31% from 11.0 to 7.6 L/m2⋅h. The temperature and concentration polarisation effects cause a substantial decline in the process driving force - ΔPm is only two thirds of the water vapour pressure difference between the bulk feed and distillate (ΔPb). Temperature polarisation is the predominant cause of the reduction in ΔPm compared with ΔPb; however, the negative impact of concentration polarisation is also notable. Finally, amongst the key operating conditions, the inlet feed temperature and concentration exert the most profound influence on the temperature and concentration polarisation during the DCMD regeneration of the hyper saline LiCl solution.

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http://hdl.handle.net/10453/146584