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Effect of mass extractions and injections on the performance of a fixed-size humidification–dehumidification desalination system

Author(s)
Miller, Jacob A.; Zubair, Syed M.; Thiel, Gregory Parker; Lienhard, John H
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Abstract
The impact of mass extractions and injections as a method for increasing the energetic performance of fixed-size humidification–dehumidification desalination systems is examined. Whereas previous studies of this problem have been restricted to thermodynamic models, the use of a more complete model that includes transport provides the ability to quantify the impact of mass extractions/injections on a realizable, fixed-size system. For a closed air, open water cycle, the results show that a single water extraction from the dehumidifier to the humidifier increases the gained output ratio by up to 10%, with extractions higher in the cycle proving more effective. The sizing problem for the humidifier and dehumidifier under thermodynamically optimized conditions found in literature is also discussed, as is the impact of system size on overall performance of a system without extractions/injections. For a range of sizes, it is shown that a rough doubling of both dehumidifier and humidifier size results in a two- to three-fold increase in gained output ratio, with diminishing returns as the absolute sizes increase.
Date issued
2013-01
URI
http://hdl.handle.net/1721.1/102079
Department
Massachusetts Institute of Technology. Abdul Latif Jameel World Water & Food Security Lab; Massachusetts Institute of Technology. Department of Mechanical Engineering
Journal
Desalination
Publisher
Elsevier
Citation
Thiel, Gregory P., Jacob A. Miller, Syed M. Zubair, and John H. Lienhard. “Effect of Mass Extractions and Injections on the Performance of a Fixed-Size Humidification–dehumidification Desalination System.” Desalination 314 (April 2013): 50–58.
Version: Author's final manuscript
ISSN
00119164

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