A hybrid multi-effect distillation and adsorption cycle

Handle URI:
http://hdl.handle.net/10754/562695
Title:
A hybrid multi-effect distillation and adsorption cycle
Authors:
Thu, Kyaw; Kim, Youngdeuk; Amy, Gary L.; Chun, Wongee; Ng, K. C.
Abstract:
This paper describes the development of a simple hybrid desalination system of a Multi-Effect Distillation (MED) and an adsorption (AD) cycle operating at sub-atmospheric pressures and temperatures. By hybridizing the conventional MED with an AD cycle, there is a symbiotic enhancement of performances of both cycles. The performance enhancement is attributed to (i) the cascade of adsorbent's regeneration temperature and this extended the usage of thermal energy emanating from the brine heater and (ii) the vapor extraction from the last MED stage by AD cycle which provides the effect of lowering saturation temperatures of all MED stages to the extent of 5°C, resulting in scavenging of heat leaks into the MED stages from the ambient. The combined effects of the hybrid cycles increase the water production capacity of the desalination plant by nearly twofolds.In this paper, we demonstrate a hybrid cycle by simulating an 8-stage MED cycle which is coupled to an adsorption cycle for direct vapor extraction from the last MED stage. The sorption properties of silica gel is utilized (acting as a mechanical vapor compressor) to reduce the saturation temperatures of MED stages. The modeling utilizes the adsorption isotherms and kinetics of the adsorbent. +. adsorbate (silica-gel. +. water) pair along with the governing equations of mass, energy and concentration. For a 8-stage MED and AD cycles operating at assorted temperatures of 65-90°C, the results show that the water production rate increases from 60% to twofolds when compared to the MED alone. The performance ratio (PR) and gain output ratio (GOR) also improve significantly. © 2012 Elsevier Ltd.
KAUST Department:
Water Desalination and Reuse Research Center (WDRC); Water Desalination & Reuse Research Cntr; Biological and Environmental Sciences and Engineering (BESE) Division
Publisher:
Elsevier
Journal:
Applied Energy
Issue Date:
Apr-2013
DOI:
10.1016/j.apenergy.2012.12.007
Type:
Article
ISSN:
03062619
Sponsors:
The authors gratefully acknowledge the financial support given by Grant (No. R33-2009-000-101660) from the World Class University (WCU) Project of the National Research Foundation and the generous research grant from Office of Competitive Research Funding (OCRF) of KAUST under the account No. 7000000411, 2012.
Appears in Collections:
Articles; Water Desalination and Reuse Research Center (WDRC); Biological and Environmental Sciences and Engineering (BESE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorThu, Kyawen
dc.contributor.authorKim, Youngdeuken
dc.contributor.authorAmy, Gary L.en
dc.contributor.authorChun, Wongeeen
dc.contributor.authorNg, K. C.en
dc.date.accessioned2015-08-03T11:01:52Zen
dc.date.available2015-08-03T11:01:52Zen
dc.date.issued2013-04en
dc.identifier.issn03062619en
dc.identifier.doi10.1016/j.apenergy.2012.12.007en
dc.identifier.urihttp://hdl.handle.net/10754/562695en
dc.description.abstractThis paper describes the development of a simple hybrid desalination system of a Multi-Effect Distillation (MED) and an adsorption (AD) cycle operating at sub-atmospheric pressures and temperatures. By hybridizing the conventional MED with an AD cycle, there is a symbiotic enhancement of performances of both cycles. The performance enhancement is attributed to (i) the cascade of adsorbent's regeneration temperature and this extended the usage of thermal energy emanating from the brine heater and (ii) the vapor extraction from the last MED stage by AD cycle which provides the effect of lowering saturation temperatures of all MED stages to the extent of 5°C, resulting in scavenging of heat leaks into the MED stages from the ambient. The combined effects of the hybrid cycles increase the water production capacity of the desalination plant by nearly twofolds.In this paper, we demonstrate a hybrid cycle by simulating an 8-stage MED cycle which is coupled to an adsorption cycle for direct vapor extraction from the last MED stage. The sorption properties of silica gel is utilized (acting as a mechanical vapor compressor) to reduce the saturation temperatures of MED stages. The modeling utilizes the adsorption isotherms and kinetics of the adsorbent. +. adsorbate (silica-gel. +. water) pair along with the governing equations of mass, energy and concentration. For a 8-stage MED and AD cycles operating at assorted temperatures of 65-90°C, the results show that the water production rate increases from 60% to twofolds when compared to the MED alone. The performance ratio (PR) and gain output ratio (GOR) also improve significantly. © 2012 Elsevier Ltd.en
dc.description.sponsorshipThe authors gratefully acknowledge the financial support given by Grant (No. R33-2009-000-101660) from the World Class University (WCU) Project of the National Research Foundation and the generous research grant from Office of Competitive Research Funding (OCRF) of KAUST under the account No. 7000000411, 2012.en
dc.publisherElsevieren
dc.subjectAdsorptionen
dc.subjectHybrid desalinationen
dc.subjectLow-temperature waste heaten
dc.subjectMulti-effect distillationen
dc.titleA hybrid multi-effect distillation and adsorption cycleen
dc.typeArticleen
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)en
dc.contributor.departmentWater Desalination & Reuse Research Cntren
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Divisionen
dc.identifier.journalApplied Energyen
dc.contributor.institutionDepartment of Nuclear and Energy Engineering, Cheju National University, 66 Jejudaehakno, Jejusi, South Koreaen
dc.contributor.institutionMechanical Engineering Department, National University of Singapore, 9 Engineering Drive 1, Singapore 117576, Singaporeen
kaust.authorThu, Kyawen
kaust.authorKim, Youngdeuken
kaust.authorAmy, Gary L.en
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