6533b7dafe1ef96bd126e319
RESEARCH PRODUCT
Exergy analysis of reverse electrodialysis
Pietro CatriniF. GiacaloneAndrea CipollinaGiorgio MicaleAlessandro TamburiniAntonio Piacentinosubject
ExergyWork (thermodynamics)Settore ING-IND/26 - Teoria Dello Sviluppo Dei Processi ChimiciMaterials scienceExergy Analysi020209 energyEnergy Engineering and Power Technology02 engineering and technologyChemical ExergyEfficiencySalinity Gradient Power; Reverse Electrodialysis; Exergy Analysis; Chemical Exergy; Efficiency7. Clean energyMembrane technology020401 chemical engineeringReversed electrodialysis0202 electrical engineering electronic engineering information engineeringSettore ING-IND/10 - Fisica Tecnica IndustrialeEnergy transformation0204 chemical engineeringProcess engineeringSalinity Gradient PowerRenewable Energy Sustainability and the Environmentbusiness.industryReverse Electrodialysi6. Clean waterVolumetric flow rateFuel TechnologyMembraneNuclear Energy and EngineeringExergy efficiencybusinessdescription
Abstract Reverse electrodialysis in closed loop configurations is a promising membrane technology in the energy conversion and storage fields. One of the main advantages of closed-loop reverse electrodialysis is the possibility of using a wide range of operating concentrations, flow rates and different salts for generating the salinity gradient. In this work, an original exergy analysis of the reverse electrodialysis process was carried out in order to investigate reverse electrodialysis performance in terms of energetic and exergetic efficiency parameters in a wide range of operating conditions. A mono-dimensional model of the reverse electrodialysis process was developed, in which all sources of irreversibility are considered, such as non-ideal membranes permselectivity, ohmic losses and uncontrolled mixing phenomena (salt and water diffusive flux across membranes). For each of them, the influence on the exergy efficiency is quantified and compared. Results also indicate how exergetic and energetic performance are largely dependent on solutions concentration: when high salinity gradient differences are used within the unit, membrane water permeability heavily affects process performance, thus reducing exergy efficiency, though a larger power output can be normally achieved. The more performing flow arrangement for the stack has been found to be the counter-current, though significant differences are observed only for long channels. Finally, performance is improved when short residence time within the stack is attained for the low-concentration solution.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2018-01-01 |