Liquid desiccant lithium chloride regeneration by membrane distillation for air conditioning

Duong, HC; Hai, FI; Al-Jubainawi, A; Ma, Z; He, T; Nghiem, LD

Liquid desiccant lithium chloride regeneration by membrane distillation for air conditioning

Duong, HC Hai, FI Al-Jubainawi, A Ma, Z He, T Nghiem, LD

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Publication Type:: Journal Article
Citation:: Separation and Purification Technology, 2017, 177 pp. 121 - 128
Issue Date:: 2017-01-01

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Field	Value	Language
dc.contributor.author	Duong, HC	en_US
dc.contributor.author	Hai, FI	en_US
dc.contributor.author	Al-Jubainawi, A	en_US
dc.contributor.author	Ma, Z	en_US
dc.contributor.author	He, T	en_US
dc.contributor.author	Nghiem, LD https://orcid.org/0000-0002-9039-5792	en_US
dc.date.issued	2017-01-01	en_US
dc.identifier.citation	Separation and Purification Technology, 2017, 177 pp. 121 - 128	en_US
dc.identifier.issn	1383-5866	en_US
dc.identifier.uri	http://hdl.handle.net/10453/125035
dc.description.abstract	© 2016 Liquid desiccant air conditioning (LDAC) has emerged as an attractive technology for improving indoor air quality and thermal comfort. Regeneration of liquid desiccants is critical to sustain the process efficiency of LDAC. This study explores membrane distillation (MD) for regeneration of lithium chloride (LiCl) desiccant solution commonly used in LDAC. The results demonstrate the viability of MD for LiCl regeneration. The MD process at the feed temperature of 65 °C could increase the LiCl concentration up to 29 wt.% without any observable LiCl loss. Given the high concentration of the LiCl solution feed, unlike traditional desalination applications, the impact of concentration polarisation on the process water flux was significant. Indeed, the calculated water flux obtained by excluding the concentration polarisation effect was more than twice the experimentally measured water flux from a concentrated LiCl solution (>20 wt.%). The regeneration process can be optimised in terms of regeneration capacity (ΔC) and specific thermal energy consumption (α) by regulating several operating conditions, including LiCl concentration, feed temperature, and circulation cross flow velocity. Increasing feed temperature and circulation cross flow velocity was beneficial to the process efficiency, enhancing water flux and ΔC while reducing α. On the other hand, increasing LiCl concentration resulted in a linear decrease in both water flux and ΔC, but an increase in α following a hyperbolic function.	en_US
dc.relation.ispartof	Separation and Purification Technology	en_US
dc.relation.isbasedon	10.1016/j.seppur.2016.12.031	en_US
dc.subject.classification	Chemical Engineering	en_US
dc.title	Liquid desiccant lithium chloride regeneration by membrane distillation for air conditioning	en_US
dc.type	Journal Article
utslib.citation.volume	177	en_US
utslib.for	0301 Analytical Chemistry	en_US
utslib.for	0904 Chemical Engineering	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
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/Strength - CTWW - Centre for Technology in Water and Wastewater Treatment
utslib.copyright.status	closed_access
pubs.publication-status	Published	en_US
pubs.volume	177	en_US

Abstract:

© 2016 Liquid desiccant air conditioning (LDAC) has emerged as an attractive technology for improving indoor air quality and thermal comfort. Regeneration of liquid desiccants is critical to sustain the process efficiency of LDAC. This study explores membrane distillation (MD) for regeneration of lithium chloride (LiCl) desiccant solution commonly used in LDAC. The results demonstrate the viability of MD for LiCl regeneration. The MD process at the feed temperature of 65 °C could increase the LiCl concentration up to 29 wt.% without any observable LiCl loss. Given the high concentration of the LiCl solution feed, unlike traditional desalination applications, the impact of concentration polarisation on the process water flux was significant. Indeed, the calculated water flux obtained by excluding the concentration polarisation effect was more than twice the experimentally measured water flux from a concentrated LiCl solution (>20 wt.%). The regeneration process can be optimised in terms of regeneration capacity (ΔC) and specific thermal energy consumption (α) by regulating several operating conditions, including LiCl concentration, feed temperature, and circulation cross flow velocity. Increasing feed temperature and circulation cross flow velocity was beneficial to the process efficiency, enhancing water flux and ΔC while reducing α. On the other hand, increasing LiCl concentration resulted in a linear decrease in both water flux and ΔC, but an increase in α following a hyperbolic function.

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http://hdl.handle.net/10453/125035