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    Hollow fibre membrane-based liquid desiccant humidity control for controlled environment agriculture

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    LDDH of CEAS_Author's Copy.pdf
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    Description:
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    Type
    Article
    Authors
    Lefers, Ryan cc
    Srivatsa Bettahalli, N.M.
    Fedoroff, Nina V.
    Ghaffour, NorEddine cc
    Davies, Philip A.
    Nunes, Suzana Pereira cc
    Leiknes, TorOve cc
    KAUST Department
    Advanced Membranes and Porous Materials Research Center
    Biological and Environmental Sciences and Engineering (BESE) Division
    Environmental Science and Engineering Program
    Nanostructured Polymeric Membrane Lab
    Physical Science and Engineering (PSE) Division
    Water Desalination and Reuse Research Center (WDRC)
    Date
    2019-05-08
    Online Publication Date
    2019-05-08
    Print Publication Date
    2019-07
    Permanent link to this record
    http://hdl.handle.net/10754/652888
    
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    Abstract
    Humidity control is an important factor affecting the overall sustainability, productivity, and energy efficiency of controlled environment agriculture. Liquid desiccants offer the potential for pinpoint control of humidity levels in controlled environments. In the present work, a dehumidification processes utilizing liquid desiccants pumped through the lumens of triple-bore PVDF hollow fibre membranes is implemented in a bench scale controlled environment agriculture system. Hydrophobic hollow fibre membranes were combined into an array and placed near the crops. Concentrated magnesium chloride liquid desiccant solution with a low vapour pressure was pumped through the hollow fibre lumens. The dehumidification permeance rate responded dynamically to the changing transpiration rate of the plants, as influenced by changes in environmental factors such as light, temperature, and vapour pressure. The dehumidification permeance rate increased from an average of 0.26–0.31 g m−2 h−1 Pa−1 as the velocity of the liquid desiccant through the hollow fibres increased from 0.023 to 0.081 m s−1. Humidity levels were targeted to be maintained within a range of 70–90% relative humidity at 23 °C. The membrane-based liquid desiccant system was demonstrated to successfully control humidity within a bench-scale controlled environment agricultural setup.
    Citation
    Lefers RM, Srivatsa Bettahalli NM, Fedoroff NV, Ghaffour N, Davies PA, et al. (2019) Hollow fibre membrane-based liquid desiccant humidity control for controlled environment agriculture. Biosystems Engineering 183: 47–57. Available: http://dx.doi.org/10.1016/j.biosystemseng.2019.04.010.
    Sponsors
    The research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST). The authors thank colleagues from Nanostructured Polymeric Membrane (NPM) group, as well as Water Desalination and Reuse Center (WDRC), and KAUST's Core Labs for their help on equipment and analysis. The graphical abstract and Fig. 1 were produced by Xavier Pita, scientific illustrator at King Abdullah University of Science and Technology (KAUST). Philip Davies acknowledges granting of a Visiting Researcher position by KAUST.
    Publisher
    Elsevier BV
    Journal
    Biosystems Engineering
    DOI
    10.1016/j.biosystemseng.2019.04.010
    Additional Links
    https://www.sciencedirect.com/science/article/pii/S1537511018312017
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.biosystemseng.2019.04.010
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Advanced Membranes and Porous Materials Research Center; Environmental Science and Engineering Program; Physical Science and Engineering (PSE) Division; Water Desalination and Reuse Research Center (WDRC)

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