A thermodynamic perspective to study energy performance of vacuum-based membrane dehumidification

Handle URI:
http://hdl.handle.net/10754/623626
Title:
A thermodynamic perspective to study energy performance of vacuum-based membrane dehumidification
Authors:
Bui, Thuan Duc; Kum Ja, M.; Gordon, Jeffrey M.; Ng, Kim Choon ( 0000-0003-3930-4127 ) ; Chua, Kian Jon
Abstract:
In humid environments, decoupling the latent and sensible cooling loads - dehumidifying - can significantly improve chiller efficiency. Here, a basic limit for dehumidification efficiency is established from fundamental thermodynamics. This is followed by the derivation of how this limit is modified when the pragmatic constraint of a finite flux must be accommodated. These limits allow one to identify promising system modifications, and to quantify their impact. The focus is on vacuum-based membrane dehumidification. New high-efficiency configurations are formulated, most notably, by coupling pumping with condensation. More than an order-of-magnitude improvement in efficiency is achievable. It is contingent on water vapor exiting at its saturation pressure rather than at ambient pressure. Sensitivity studies to recovery ratio, temperature, relative humidity and membrane selectivity are also presented.
KAUST Department:
Water Desalination and Reuse Research Center (WDRC)
Citation:
Bui TD, Kum Ja M, Gordon JM, Ng KC, Chua KJ (2017) A thermodynamic perspective to study energy performance of vacuum-based membrane dehumidification. Energy. Available: http://dx.doi.org/10.1016/j.energy.2017.05.075.
Publisher:
Elsevier BV
Journal:
Energy
Issue Date:
13-May-2017
DOI:
10.1016/j.energy.2017.05.075
Type:
Article
ISSN:
0360-5442
Sponsors:
The authors gratefully acknowledge the generous funding from the National Research Foundation (NRF) of Singapore under the Energy Innovation Research Programme (EIRP) Funding Scheme (R-265-00-543-279) managed on our behalf by the Building and Construction Authority (BCA). JMG expresses his gratitude to Prof. Kian Jon (Ernest) Chua for his generous and gracious hospitality at NUS during the period of this research.
Additional Links:
http://www.sciencedirect.com/science/article/pii/S0360544217308289
Appears in Collections:
Articles; Water Desalination and Reuse Research Center (WDRC)

Full metadata record

DC FieldValue Language
dc.contributor.authorBui, Thuan Ducen
dc.contributor.authorKum Ja, M.en
dc.contributor.authorGordon, Jeffrey M.en
dc.contributor.authorNg, Kim Choonen
dc.contributor.authorChua, Kian Jonen
dc.date.accessioned2017-05-17T07:41:38Z-
dc.date.available2017-05-17T07:41:38Z-
dc.date.issued2017-05-13en
dc.identifier.citationBui TD, Kum Ja M, Gordon JM, Ng KC, Chua KJ (2017) A thermodynamic perspective to study energy performance of vacuum-based membrane dehumidification. Energy. Available: http://dx.doi.org/10.1016/j.energy.2017.05.075.en
dc.identifier.issn0360-5442en
dc.identifier.doi10.1016/j.energy.2017.05.075en
dc.identifier.urihttp://hdl.handle.net/10754/623626-
dc.description.abstractIn humid environments, decoupling the latent and sensible cooling loads - dehumidifying - can significantly improve chiller efficiency. Here, a basic limit for dehumidification efficiency is established from fundamental thermodynamics. This is followed by the derivation of how this limit is modified when the pragmatic constraint of a finite flux must be accommodated. These limits allow one to identify promising system modifications, and to quantify their impact. The focus is on vacuum-based membrane dehumidification. New high-efficiency configurations are formulated, most notably, by coupling pumping with condensation. More than an order-of-magnitude improvement in efficiency is achievable. It is contingent on water vapor exiting at its saturation pressure rather than at ambient pressure. Sensitivity studies to recovery ratio, temperature, relative humidity and membrane selectivity are also presented.en
dc.description.sponsorshipThe authors gratefully acknowledge the generous funding from the National Research Foundation (NRF) of Singapore under the Energy Innovation Research Programme (EIRP) Funding Scheme (R-265-00-543-279) managed on our behalf by the Building and Construction Authority (BCA). JMG expresses his gratitude to Prof. Kian Jon (Ernest) Chua for his generous and gracious hospitality at NUS during the period of this research.en
dc.publisherElsevier BVen
dc.relation.urlhttp://www.sciencedirect.com/science/article/pii/S0360544217308289en
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Energy. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Energy, [, , (2017-05-13)] DOI: 10.1016/j.energy.2017.05.075 . © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectVacuum-based membrane dehumidificationen
dc.subjectDehumidification energy efficiencyen
dc.subjectCoefficient of performanceen
dc.subjectThermodynamic limiten
dc.subjectLatent heaten
dc.titleA thermodynamic perspective to study energy performance of vacuum-based membrane dehumidificationen
dc.typeArticleen
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)en
dc.identifier.journalEnergyen
dc.eprint.versionPost-printen
dc.contributor.institutionNational University of Singapore, Department of Mechanical Engineering, 9 Engineering Drive 1, Singapore, 117576, Singaporeen
dc.contributor.institutionDepartment of Solar Energy and Environmental Physics, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus, 84990, Israelen
kaust.authorNg, Kim Choonen
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