Second law analysis of reverse osmosis desalination plants: An alternative design using pressure retarded osmosis

A second law analysis of a reverse osmosis desalination plant is carried out using reliable seawater exergy formulation instead of a common model in literature that represents seawater as an ideal mixture of liquid water and solid sodium chloride

Mostafa H. Sharqawy; Syed M. Zubair; John H. Lienhard

2011

Scholarcy highlights

  • A second law analysis of a reverse osmosis desalination plant is carried out using reliable seawater exergy formulation instead of a common model in literature that represents seawater as an ideal mixture of liquid water and solid sodium chloride
  • It is demonstrated that the previous model has serious shortcomings, with regard to calculation of the seawater flow exergy, the minimum work of separation, and the second law efficiency
  • The proposed alternative design has a second law efficiency of 20%, and the input power is reduced by 38% relative to original reverse osmosis system
  • ► A proposed using the energy recovery device increases the RO plant’s second law efficiency to 20% and reduces the input power

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