Energy consumption and costs with a multi-stage flashing (MSF) desalting system

M. A. Darwish, Fouad A. Yousef, N. M. Al-Najem

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23 Citations (Scopus)


Energy consumption and costs are among the main parameters affecting the choice of desalting systems and the final unit cost of the desalted water. In addition to the performance of the plant, the cost of the consumed energy depends on the quality of energy, i.e., either mechanical or thermal and, if thermal, at what temperature. The cost also depends on the way this energy is applied (e.g., thermal energy can be directly applied from a boiler or from cogeneration steam turbines or from heat recovery steam generators of gas turbines). The use of the concept of availability (exergy) to bring different kinds of energy to a common basis of comparison is presented here. The way energy applied was considered in comparing the energy consumption of different desalting systems, namely, multi-stage flash (MSF), conventional multi-effect boiling (MEB), thermovapor compression (TVC), mechanical vapor compression (MVC), and reverse osmosis (RO) desalting systems. A rational basis for costing thermal and electrical energy was used to compare the energy costs of different types of desalting systems.

Original languageEnglish
Pages (from-to)285-302
Number of pages18
Issue number3
Publication statusPublished - Jun 1997



  • Co-generation steam turbine
  • Dual-purpose power plants
  • Efficiency
  • Mechanical thermal and available energy consumption
  • Multi-stage flash
  • Thermo-vapor compression
  • Utilization factor

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)
  • Water Science and Technology
  • Mechanical Engineering

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