Direct contact membrane distillation for liquid desiccant regeneration and fresh water production: Experimental investigation, response surface modeling and optimization

•Membrane distillation was used for desiccant regeneration and water production.•Interactions of operating parameters on regeneration performance were evaluated.•Transmembrane temperature difference should be maintained higher than a threshold.•An optimal flow rate can improve the regeneration perfo...

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Veröffentlicht in:Applied thermal engineering 2021-02, Vol.184, p.116293, Article 116293
Hauptverfasser: Liu, Jingjing, Ren, Haoshan, Hai, Faisal I., Albdoor, Ahmed K., Ma, Zhenjun
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container_start_page 116293
container_title Applied thermal engineering
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creator Liu, Jingjing
Ren, Haoshan
Hai, Faisal I.
Albdoor, Ahmed K.
Ma, Zhenjun
description •Membrane distillation was used for desiccant regeneration and water production.•Interactions of operating parameters on regeneration performance were evaluated.•Transmembrane temperature difference should be maintained higher than a threshold.•An optimal flow rate can improve the regeneration performance.•Optimal conditions to maximize the regeneration performance were identified. Liquid desiccant cooling (LDC) systems are being widely considered as a promising alternative for energy savings and the regeneration is one of the most significant processes of the LDC systems. This paper presents a direct contact membrane distillation (DCMD) regenerator for liquid desiccants regeneration of LDC systems and fresh water production simultaneously. The novelty of this study is to use the response surface method to establish models to predict the DCMD regeneration performance with highly concentrated lithium chloride solutions based on the experimental investigation. The interactive effects of the operating parameters, i.e. initial feed concentration, feed inlet temperature, distillate inlet temperature, and feed and distillate flow rates were studied and the optimal conditions of the DCMD regenerator to maximize the feed concentration increase and transmembrane water flux were identified. The experimental results showed that stable regeneration performance and water production with the lithium chloride salt rejection rate over 99.99% by the membrane were achieved using the DCMD regenerator. The temperature difference between the feed and distillate sides should be controlled higher than a threshold to ensure continuous liquid desiccant regeneration. Initial feed concentration and flow rate exhibited a significant interaction in improving the DCMD regeneration performance. An optimal flow rate for better regeneration performance can be observed when increasing the initial feed concentration. The optimization results showed that the feed concentration increase and transmembrane water flux can be improved by 39.7% and 41.6% respectively under the optimal conditions as compared to the best case observed in the response surface method designed experiments.
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Liquid desiccant cooling (LDC) systems are being widely considered as a promising alternative for energy savings and the regeneration is one of the most significant processes of the LDC systems. This paper presents a direct contact membrane distillation (DCMD) regenerator for liquid desiccants regeneration of LDC systems and fresh water production simultaneously. The novelty of this study is to use the response surface method to establish models to predict the DCMD regeneration performance with highly concentrated lithium chloride solutions based on the experimental investigation. The interactive effects of the operating parameters, i.e. initial feed concentration, feed inlet temperature, distillate inlet temperature, and feed and distillate flow rates were studied and the optimal conditions of the DCMD regenerator to maximize the feed concentration increase and transmembrane water flux were identified. The experimental results showed that stable regeneration performance and water production with the lithium chloride salt rejection rate over 99.99% by the membrane were achieved using the DCMD regenerator. The temperature difference between the feed and distillate sides should be controlled higher than a threshold to ensure continuous liquid desiccant regeneration. Initial feed concentration and flow rate exhibited a significant interaction in improving the DCMD regeneration performance. An optimal flow rate for better regeneration performance can be observed when increasing the initial feed concentration. The optimization results showed that the feed concentration increase and transmembrane water flux can be improved by 39.7% and 41.6% respectively under the optimal conditions as compared to the best case observed in the response surface method designed experiments.</description><identifier>ISSN: 1359-4311</identifier><identifier>EISSN: 1873-5606</identifier><identifier>DOI: 10.1016/j.applthermaleng.2020.116293</identifier><language>eng</language><publisher>Oxford: Elsevier Ltd</publisher><subject>Desiccants ; Direct contact membrane distillation ; Distillates ; Distillation ; Distilled water ; Flow velocity ; Fresh water ; Heat transfer ; Humidity ; Inlet temperature ; Liquid desiccant regeneration ; Lithium chloride ; Membranes ; Optimization ; Regeneration ; Rejection rate ; Response surface method ; Response surface methodology ; Studies ; Temperature ; Temperature gradients</subject><ispartof>Applied thermal engineering, 2021-02, Vol.184, p.116293, Article 116293</ispartof><rights>2020 Elsevier Ltd</rights><rights>Copyright Elsevier BV Feb 5, 2021</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c358t-ab8aa526c49484521b14fdc97fdd89b88ef3cfd7136c3139a3c88dd5b7d7fcdc3</citedby><cites>FETCH-LOGICAL-c358t-ab8aa526c49484521b14fdc97fdd89b88ef3cfd7136c3139a3c88dd5b7d7fcdc3</cites><orcidid>0000-0003-0302-5425 ; 0000-0001-6215-4273</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.applthermaleng.2020.116293$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3550,27924,27925,45995</link.rule.ids></links><search><creatorcontrib>Liu, Jingjing</creatorcontrib><creatorcontrib>Ren, Haoshan</creatorcontrib><creatorcontrib>Hai, Faisal I.</creatorcontrib><creatorcontrib>Albdoor, Ahmed K.</creatorcontrib><creatorcontrib>Ma, Zhenjun</creatorcontrib><title>Direct contact membrane distillation for liquid desiccant regeneration and fresh water production: Experimental investigation, response surface modeling and optimization</title><title>Applied thermal engineering</title><description>•Membrane distillation was used for desiccant regeneration and water production.•Interactions of operating parameters on regeneration performance were evaluated.•Transmembrane temperature difference should be maintained higher than a threshold.•An optimal flow rate can improve the regeneration performance.•Optimal conditions to maximize the regeneration performance were identified. Liquid desiccant cooling (LDC) systems are being widely considered as a promising alternative for energy savings and the regeneration is one of the most significant processes of the LDC systems. This paper presents a direct contact membrane distillation (DCMD) regenerator for liquid desiccants regeneration of LDC systems and fresh water production simultaneously. The novelty of this study is to use the response surface method to establish models to predict the DCMD regeneration performance with highly concentrated lithium chloride solutions based on the experimental investigation. The interactive effects of the operating parameters, i.e. initial feed concentration, feed inlet temperature, distillate inlet temperature, and feed and distillate flow rates were studied and the optimal conditions of the DCMD regenerator to maximize the feed concentration increase and transmembrane water flux were identified. The experimental results showed that stable regeneration performance and water production with the lithium chloride salt rejection rate over 99.99% by the membrane were achieved using the DCMD regenerator. The temperature difference between the feed and distillate sides should be controlled higher than a threshold to ensure continuous liquid desiccant regeneration. Initial feed concentration and flow rate exhibited a significant interaction in improving the DCMD regeneration performance. An optimal flow rate for better regeneration performance can be observed when increasing the initial feed concentration. The optimization results showed that the feed concentration increase and transmembrane water flux can be improved by 39.7% and 41.6% respectively under the optimal conditions as compared to the best case observed in the response surface method designed experiments.</description><subject>Desiccants</subject><subject>Direct contact membrane distillation</subject><subject>Distillates</subject><subject>Distillation</subject><subject>Distilled water</subject><subject>Flow velocity</subject><subject>Fresh water</subject><subject>Heat transfer</subject><subject>Humidity</subject><subject>Inlet temperature</subject><subject>Liquid desiccant regeneration</subject><subject>Lithium chloride</subject><subject>Membranes</subject><subject>Optimization</subject><subject>Regeneration</subject><subject>Rejection rate</subject><subject>Response surface method</subject><subject>Response surface methodology</subject><subject>Studies</subject><subject>Temperature</subject><subject>Temperature gradients</subject><issn>1359-4311</issn><issn>1873-5606</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><recordid>eNqNkc1u3SAQha0qlZqkfQekdhnfGoNtXGUT5aetFKmbZI3wMNxwZYMDOGnyRn3Lcq-z6a6rQZpzznD0FcUXWm1oRduvu42a5zE9YJjUiG67qas6r2hb9-xdcUxFx8qmrdqj_GZNX3JG6YfiJMZdVdFadPy4-HNlA0Ii4F1SeU44DUE5JNrGZMdRJesdMT6Q0T4uVhON0QIol0jALToMq0I5TUzA-ECeVcJA5uD1AvvVN3L9e8ZgJ8wXRmLdE-bk7cF2lkPi7F1EEpdgFCCZvMbRuu0h0c_JTvb1oP1YvDdqjPjpbZ4W9zfXd5c_yttf339eXtyWwBqRSjUIpZq6Bd5zwZuaDpQbDX1ntBb9IAQaBkZ3lLXAKOsVAyG0boZOdwY0sNPi85qbKzwu-a9y55fg8klZNxXjbc05zarzVQXBxxjQyDlXVOFF0kru4cid_BeO3MORK5xsv1ntmJs8WQwygkUHqA84pPb2_4L-AuoKp8E</recordid><startdate>20210205</startdate><enddate>20210205</enddate><creator>Liu, Jingjing</creator><creator>Ren, Haoshan</creator><creator>Hai, Faisal I.</creator><creator>Albdoor, Ahmed K.</creator><creator>Ma, Zhenjun</creator><general>Elsevier Ltd</general><general>Elsevier BV</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7TB</scope><scope>8FD</scope><scope>FR3</scope><scope>KR7</scope><orcidid>https://orcid.org/0000-0003-0302-5425</orcidid><orcidid>https://orcid.org/0000-0001-6215-4273</orcidid></search><sort><creationdate>20210205</creationdate><title>Direct contact membrane distillation for liquid desiccant regeneration and fresh water production: Experimental investigation, response surface modeling and optimization</title><author>Liu, Jingjing ; 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Liquid desiccant cooling (LDC) systems are being widely considered as a promising alternative for energy savings and the regeneration is one of the most significant processes of the LDC systems. This paper presents a direct contact membrane distillation (DCMD) regenerator for liquid desiccants regeneration of LDC systems and fresh water production simultaneously. The novelty of this study is to use the response surface method to establish models to predict the DCMD regeneration performance with highly concentrated lithium chloride solutions based on the experimental investigation. The interactive effects of the operating parameters, i.e. initial feed concentration, feed inlet temperature, distillate inlet temperature, and feed and distillate flow rates were studied and the optimal conditions of the DCMD regenerator to maximize the feed concentration increase and transmembrane water flux were identified. The experimental results showed that stable regeneration performance and water production with the lithium chloride salt rejection rate over 99.99% by the membrane were achieved using the DCMD regenerator. The temperature difference between the feed and distillate sides should be controlled higher than a threshold to ensure continuous liquid desiccant regeneration. Initial feed concentration and flow rate exhibited a significant interaction in improving the DCMD regeneration performance. An optimal flow rate for better regeneration performance can be observed when increasing the initial feed concentration. 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subjects Desiccants
Direct contact membrane distillation
Distillates
Distillation
Distilled water
Flow velocity
Fresh water
Heat transfer
Humidity
Inlet temperature
Liquid desiccant regeneration
Lithium chloride
Membranes
Optimization
Regeneration
Rejection rate
Response surface method
Response surface methodology
Studies
Temperature
Temperature gradients
title Direct contact membrane distillation for liquid desiccant regeneration and fresh water production: Experimental investigation, response surface modeling and optimization
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