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A Modeling and Simulation Method for Preliminary Design of an Electro-Variable Displacement Pump
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Component innovations for lower cost mechanical vapor compression.

Carson I Tucker1, Timothy V Bartholomew2, Alexander V Dudchenko3

  • 1Department of Mechanical Engineering, Stanford University, Stanford, CA, 94305, USA.

Water Research
|June 25, 2024
PubMed
Summary

Mechanical Vapor Compression (MVC) costs depend on brine salinity and water recovery. Innovations in evaporator materials and performance can significantly reduce the levelized cost of water (LCOW) for MVC systems.

Keywords:
Cost optimizationMechanical vapor compression (MVC)Process design and operationTechno-economic analysis

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Area of Science:

  • Chemical Engineering
  • Water Treatment Technologies
  • Materials Science

Background:

  • Mechanical Vapor Compression (MVC) is crucial for challenging brine concentration despite high costs.
  • Optimizing MVC is key to reducing the levelized cost of water (LCOW).

Purpose of the Study:

  • To assess how feedwater salinity and water recovery impact MVC costs.
  • To quantify the benefits of component improvements and cost reductions for MVC.

Main Methods:

  • Developed a cost optimization model integrating thermophysical, heat/mass transfer, and technoeconomic aspects.
  • Coupled models to identify cost-effective MVC designs based on salinity and recovery.
  • Conducted sensitivity analyses to pinpoint high-value innovation targets.

Main Results:

  • LCOW varies from $3.6 to $6.1/m³ for seawater salinities (25-150 g/kg) and recoveries (40-80%).
  • Evaporator material costs and heat transfer performance significantly influence LCOW.
  • A 25% reduction in evaporator cost with a <10% performance decrease yields 8% LCOW reduction.

Conclusions:

  • MVC cost-effectiveness is sensitive to feedwater salinity and water recovery targets.
  • Innovations in evaporator materials and performance offer substantial cost reduction potential for MVC.
  • Polymer-composite evaporator tubes represent a promising avenue for reducing MVC costs.