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Feasibility study of energy storage by concentrating/desalinating water : concentrated water energy storage
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He, Wei and Wang, Jihong (2017) Feasibility study of energy storage by concentrating/desalinating water : concentrated water energy storage. Applied Energy, 185 (1). pp. 872-884. doi:10.1016/j.apenergy.2016.10.077
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Official URL: https://doi.org/10.1016/j.apenergy.2016.10.077
Abstract
The paper is to report the work on a preliminary feasibility study of energy storage by concentrating/desalinating water. First, a novel concentrated water energy storage (CWES) is proposed which aims to use off-peak electricity to build the osmotic potential between water bodies with different concentrations, namely brine and freshwater. During peak time, the osmotic potential energy is released to generate electricity. Two scenarios of CWES are specified including a CWES system using reverse osmosis (RO) and pressure retarded osmosis (PRO), and a CWES system co-storing/generating energy and freshwater using “osmotic-equivalent” wastewater. A comprehensive case study is carried out with focusing on the configuration of CWES using RO and PRO. It is found that the limiting cycle efficiency of the CWES using RO and PRO is inversely proportional to the RO water recovery and independent of the initial salinity. Therefore, to balance the energy density and cycle efficiency of CWES, it is recommended to operate a system at lower RO water recovery with higher concentration of the initial solution. Detailed energy analysis of detrimental effects in mass transfer, e.g. concentration polarization and salt leakage, and energy losses of pressurisation and expansion of pressurised water, are studied. Finally, a preliminary cost analysis of CWES is given.
| Item Type: | Journal Article | ||||||||
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| Subjects: | T Technology > TD Environmental technology. Sanitary engineering T Technology > TJ Mechanical engineering and machinery |
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| Divisions: | Faculty of Science > Engineering | ||||||||
| Library of Congress Subject Headings (LCSH): | Saline water conversion -- Reverse osmosis proces, Osmosis | ||||||||
| Journal or Publication Title: | Applied Energy | ||||||||
| Publisher: | Elsevier BV | ||||||||
| ISSN: | 0306-2619 | ||||||||
| Official Date: | 1 January 2017 | ||||||||
| Dates: |
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| Volume: | 185 | ||||||||
| Number: | 1 | ||||||||
| Page Range: | pp. 872-884 | ||||||||
| DOI: | 10.1016/j.apenergy.2016.10.077 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Funder: | Engineering and Physical Sciences Research Council (EPSRC), China. Guo jia ke xue ji shu bu [Ministry of Science and Technology] (CMST) | ||||||||
| Grant number: | EP/L014211/1, EP/K002228/1 (EPSRC), 2015CB251301 (CMST) | ||||||||
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