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

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    Type
    Article
    Authors
    Bui, Thuan Duc
    Kum Ja, M.
    Gordon, Jeffrey M.
    Ng, Kim Choon cc
    Chua, Kian Jon
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Environmental Science and Engineering Program
    Water Desalination and Reuse Research Center (WDRC)
    Date
    2017-05-13
    Online Publication Date
    2017-05-13
    Print Publication Date
    2017-08
    Permanent link to this record
    http://hdl.handle.net/10754/623626
    
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    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.
    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.
    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.
    Publisher
    Elsevier BV
    Journal
    Energy
    DOI
    10.1016/j.energy.2017.05.075
    Additional Links
    http://www.sciencedirect.com/science/article/pii/S0360544217308289
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.energy.2017.05.075
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC)

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