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    An exergy approach to efficiency evaluation of desalination

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    12E4982628.pdf
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    Type
    Article
    Authors
    Ng, Kim Choon cc
    Shahzad, Muhammad Wakil
    Son, Hyuk Soo
    Hamed, Osman A.
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Environmental Science and Engineering Program
    Water Desalination and Reuse Research Center (WDRC)
    KAUST Grant Number
    FCC/1/1971-03-01
    Date
    2017-05-02
    Online Publication Date
    2017-05-02
    Print Publication Date
    2017-05
    Permanent link to this record
    http://hdl.handle.net/10754/623674
    
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    Abstract
    This paper presents an evaluation process efficiency based on the consumption of primary energy for all types of practical desalination methods available hitherto. The conventional performance ratio has, thus far, been defined with respect to the consumption of derived energy, such as the electricity or steam, which are susceptible to the conversion losses of power plants and boilers that burned the input primary fuels. As derived energies are usually expressed by the units, either kWh or Joules, these units cannot differentiate the grade of energy supplied to the processes accurately. In this paper, the specific energy consumption is revisited for the efficacy of all large-scale desalination plants. In today's combined production of electricity and desalinated water, accomplished with advanced cogeneration concept, the input exergy of fuels is utilized optimally and efficiently in a temperature cascaded manner. By discerning the exergy destruction successively in the turbines and desalination processes, the relative contribution of primary energy to the processes can be accurately apportioned to the input primary energy. Although efficiency is not a law of thermodynamics, however, a common platform for expressing the figures of merit explicit to the efficacy of desalination processes can be developed meaningfully that has the thermodynamic rigor up to the ideal or thermodynamic limit of seawater desalination for all scientists and engineers to aspire to.
    Citation
    Ng KC, Shahzad MW, Son HS, Hamed OA (2017) An exergy approach to efficiency evaluation of desalination. Applied Physics Letters 110: 184101. Available: http://dx.doi.org/10.1063/1.4982628.
    Sponsors
    The authors would like to thank the King Abdullah University of Science and Technology (KAUST) (CCF3 Project No: FCC/1/1971-03-01) and Desalination Technology Research Institute (DTRI) of SWCC.
    Publisher
    AIP Publishing
    Journal
    Applied Physics Letters
    DOI
    10.1063/1.4982628
    Additional Links
    http://aip.scitation.org/doi/10.1063/1.4982628
    ae974a485f413a2113503eed53cd6c53
    10.1063/1.4982628
    Scopus Count
    Collections
    Articles; Biological and Environmental Sciences and Engineering (BESE) Division; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC)

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