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Journal of Non-Equilibrium Thermodynamics

Founded by Keller, Jürgen U.

Editor-in-Chief: Hoffmann, Karl Heinz

Managing Editor: Prehl, Janett / Schwalbe, Karsten

Ed. by Michaelides, Efstathios E. / Rubi, J. Miguel

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IMPACT FACTOR 2017: 1.633
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1437-4358
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Volume 41, Issue 4

Issues

Multistage Pressure-Retarded Osmosis

Devesh Bharadwaj / Thomas M. Fyles / Henning Struchtrup
Published Online: 2016-07-12 | DOI: https://doi.org/10.1515/jnet-2016-0017

Abstract

One promising sustainable energy source is the chemical potential difference between salt and freshwater. The membrane process of pressure-retarded osmosis (PRO) has been the most widely investigated means to harvest salinity gradient energy. In this report, we analyse the thermodynamic efficiency of multistage PRO systems to optimize energy recovery from a salinity gradient. We establish a unified description of the efficiencies of the component pumps (P), turbines (T), pressure exchangers (PX), and membrane modules (M) and exploit this model to determine the maximum available work with respect to the volume of the brine produced, the volume of the sea water consumed, or the volume of the freshwater that permeates the membrane. In an idealized series configuration of 1–20 modules (PMT), the three optimization conditions have significantly different intermediate operating pressures in the modules, but demonstrate that multistage systems can recover a significantly larger fraction of the available work compared to single-stage PRO. The biggest proportional advantage occurs for one to three modules in series. The available work depends upon the component efficiencies, but the proportional advantage of multistage PRO is retained. We also optimize one- and two-stage PX–MT and PMT configurations with respect to the three volume parameters, and again significantly different optimal operating conditions are found. PX–MT systems are more efficient than PMT systems, and two-stage systems have efficiency advantages that transcend assumed component efficiencies. The results indicate that overall system design with a clear focus on critical optimization parameters has the potential to significantly improve the near-term practical feasibility of PRO.

Keywords: pressure-retarded osmosis; renewable energies; pressure exchangers

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About the article

Received: 2016-03-07

Revised: 2016-05-18

Accepted: 2016-05-27

Published Online: 2016-07-12

Published in Print: 2016-10-01


This research was supported by the Natural Sciences and Engineering Research Council of Canada (NSERC) grants DG 1113 (TMF) and DG 03679 (HS).


Citation Information: Journal of Non-Equilibrium Thermodynamics, Volume 41, Issue 4, Pages 327–347, ISSN (Online) 1437-4358, ISSN (Print) 0340-0204, DOI: https://doi.org/10.1515/jnet-2016-0017.

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