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Exergetic analysis of a brackish water reverse osmosis desalination unit with various energy recovery systems

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  • Qureshi, Bilal Ahmed
  • Zubair, Syed M.

Abstract

Exergetic analysis of a reverse osmosis desalination unit is performed for brackish water feed using different energy recovery methods. This includes single and two-stage pressure retarded osmosis units (for infinite area). The correct definition of exergetic efficiency for such systems is also discussed. A clear connection is seen between specific energy consumption and the efficiency definition chosen such that one can be determined from the other. The program written is validated against experimental and numerical data from the literature with nearly zero percent error. The effect of salinity, turbine and pump efficiency as well as mass ratio is studied. In all cases, it is seen that the reverse osmosis unit has the best efficiency when a pressure exchanger is used as an energy recovery device (∼16% maximum). All pressure retarded osmosis options investigated had efficiencies below or approximately equal to the hydro-turbine. Since finite area and concentration polarization would further decrease the efficiency, therefore, it does not seem to be a viable energy recovery method for reverse osmosis units with brackish water feed.

Suggested Citation

  • Qureshi, Bilal Ahmed & Zubair, Syed M., 2015. "Exergetic analysis of a brackish water reverse osmosis desalination unit with various energy recovery systems," Energy, Elsevier, vol. 93(P1), pages 256-265.
    • Handle: RePEc:eee:energy:v:93:y:2015:i:p1:p:256-265
    DOI: 10.1016/j.energy.2015.09.003
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    Cited by:

    1. Lee, Sangkeum & Hong, Junhee & Har, Dongsoo, 2016. "Jointly optimized control for reverse osmosis desalination process with different types of energy resource," Energy, Elsevier, vol. 117(P1), pages 116-130.
    2. Blanco-Marigorta, A.M. & Lozano-Medina, A. & Marcos, J.D., 2017. "A critical review of definitions for exergetic efficiency in reverse osmosis desalination plants," Energy, Elsevier, vol. 137(C), pages 752-760.
    3. Lai, Xiaotian & Long, Rui & Liu, Zhichun & Liu, Wei, 2018. "Stirling engine powered reverse osmosis for brackish water desalination to utilize moderate temperature heat," Energy, Elsevier, vol. 165(PA), pages 916-930.
    4. Kim, Minseok & Kim, Suhan, 2018. "Practical limit of energy production from seawater by full-scale pressure retarded osmosis," Energy, Elsevier, vol. 158(C), pages 373-382.
    5. Nagy, Endre & Dudás, József & Hegedüs, Imre, 2016. "Improvement of the energy generation by pressure retarded osmosis," Energy, Elsevier, vol. 116(P2), pages 1323-1333.
    6. Long, Rui & Lai, Xiaotian & Liu, Zhichun & Liu, Wei, 2019. "Pressure retarded osmosis: Operating in a compromise between power density and energy efficiency," Energy, Elsevier, vol. 172(C), pages 592-598.
    7. Touati, Khaled & Tadeo, Fernando & Elfil, Hamza, 2017. "Osmotic energy recovery from Reverse Osmosis using two-stage Pressure Retarded Osmosis," Energy, Elsevier, vol. 132(C), pages 213-224.
    8. Jamil, Muhammad Ahmad & Zubair, Syed M., 2017. "Design and analysis of a forward feed multi-effect mechanical vapor compression desalination system: An exergo-economic approach," Energy, Elsevier, vol. 140(P1), pages 1107-1120.

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