Theoretical power density from salinity gradients using reverse electrodialysis

D.A. Vermaas, E. Guler, M. Saakes, K. Nijmeijer

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

104 Citations (Scopus)

Abstract

Reverse electrodialysis (RED) is a technology to generate power from mixing waters with different salinity. The net power density (i.e. power per membrane area) is determined by 1) the membrane potential, 2) the ohmic resistance, 3) the resistance due to changing bulk concentrations, 4) the boundary layer resistance and 5) the power required to pump the feed water. Previous power density estimations often neglected the latter three terms. This paper provides a set of analytical equations to estimate the net power density obtainable from RED stacks with spacers and RED stacks with profiled membranes. With the current technology, the obtained maximum net power density is calculated at 2.7 W/m2. Higher power densities could be obtained by changing the cell design, in particular the membrane resistance and the cell length. Changing these parameters one and two orders of magnitude respectively, the calculated net power density is close to 20 W/m2.

Original languageEnglish
Title of host publicationEnergy Procedia
PublisherElsevier Bedrijfsinformatie
Pages170-184
Number of pages15
Volume20
ISBN (Print)9781627484299
DOIs
Publication statusPublished - 2012
Externally publishedYes
EventTechnoport 2012 - Sharing Possibilities and 2nd Renewable Energy Research Conference, RERC 2012 - Trondheim, Norway
Duration: 16 Apr 201218 Apr 2012

Conference

ConferenceTechnoport 2012 - Sharing Possibilities and 2nd Renewable Energy Research Conference, RERC 2012
CountryNorway
CityTrondheim
Period16/04/1218/04/12

Keywords

  • Boundary layer
  • Ion exchange membranes
  • Profiled membranes
  • Reverse electrodialysis
  • Salinity gradient energy
  • Spacers

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