LAPSE:2023.25251
Published Article
LAPSE:2023.25251
Heat to Hydrogen by Reverse Electrodialysis—Using a Non-Equilibrium Thermodynamics Model to Evaluate Hydrogen Production Concepts Utilising Waste Heat
March 28, 2023
The reverse electrodialysis heat engine (REDHE) is a promising salinity gradient energy technology, capable of producing hydrogen with an input of waste heat at temperatures below 100 °C. A salinity gradient drives water electrolysis in the reverse electrodialysis (RED) cell, and spent solutions are regenerated using waste heat in a precipitation or evaporation unit. This work presents a non-equilibrium thermodynamics model for the RED cell, and the hydrogen production is investigated for KCl/water solutions. The results show that the evaporation concept requires 40 times less waste heat and produces three times more hydrogen than the precipitation concept. With commercial evaporation technology, a system efficiency of 2% is obtained, with a hydrogen production rate of 0.38 gH2 m−2h−1 and a waste heat requirement of 1.7 kWh gH2−1. The water transference coefficient and the salt diffusion coefficient are identified as membrane properties with a large negative impact on hydrogen production and system efficiency. Each unit of the water transference coefficient in the range tw=[0−10] causes a −7 mV decrease in unit cell electric potential, and a −0.3% decrease in system efficiency. Increasing the membrane salt diffusion coefficient from 10−12 to 10−11 leads to the system efficiency decreasing from 2% to 0.6%.
Record ID
Keywords
Hydrogen, ion-exchange membranes, non-equilibrium thermodynamics, reverse electrodialysis heat engine
Subject
Suggested Citation
Solberg SBB, Zimmermann P, Wilhelmsen Ø, Lamb JJ, Bock R, Burheim OS. Heat to Hydrogen by Reverse Electrodialysis—Using a Non-Equilibrium Thermodynamics Model to Evaluate Hydrogen Production Concepts Utilising Waste Heat. (2023). LAPSE:2023.25251
Author Affiliations
Solberg SBB: Department of Energy and Process Engineering, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim, Norway [ORCID]
Zimmermann P: Department of Energy and Process Engineering, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim, Norway
Wilhelmsen Ø: Department of Chemistry, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim, Norway
Lamb JJ: Department of Energy and Process Engineering, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim, Norway [ORCID]
Bock R: Federal Institute for Materials Research and Testing (BAM), 12205 Berlin, Germany [ORCID]
Burheim OS: Department of Energy and Process Engineering, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim, Norway
Zimmermann P: Department of Energy and Process Engineering, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim, Norway
Wilhelmsen Ø: Department of Chemistry, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim, Norway
Lamb JJ: Department of Energy and Process Engineering, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim, Norway [ORCID]
Bock R: Federal Institute for Materials Research and Testing (BAM), 12205 Berlin, Germany [ORCID]
Burheim OS: Department of Energy and Process Engineering, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim, Norway
Journal Name
Energies
Volume
15
Issue
16
First Page
6011
Year
2022
Publication Date
2022-08-19
Published Version
ISSN
1996-1073
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Original Submission
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PII: en15166011, Publication Type: Journal Article
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LAPSE:2023.25251
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doi:10.3390/en15166011
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Mar 28, 2023
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