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Performance parameters analysis of reverse electrodialysis process: Sensitive to the repeating unit pairs, inflow velocity and feed concentration
Author(s) -
Fu LiuJia,
Ji ZhiYong,
Tumba Kaniki,
Yang FengJuan,
Liu Jie,
Zhao YingYing,
Yuan JunSheng
Publication year - 2020
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.5354
Subject(s) - reversed electrodialysis , salinity , stack (abstract data type) , power density , osmotic power , internal resistance , seawater , flow velocity , chemistry , voltage , inflow , maximum power principle , analytical chemistry (journal) , sensitivity (control systems) , flow (mathematics) , electrodialysis , materials science , power (physics) , mechanics , membrane , chromatography , thermodynamics , reverse osmosis , electrical engineering , physics , electronic engineering , engineering , ecology , forward osmosis , battery (electricity) , computer science , biology , biochemistry , programming language
Summary Reverse electrodialysis (RED) is the most promising technique based on ion exchange membranes for harvesting salinity gradient energy. In the present study aimed to explore the sensitivity of the RED stack performance, different concentrations of NaCl were prepared and used to simulate the salinity of concentrated seawater and that of river water at 298 K. Some major factors including the repeating unit pairs, the flow velocity and the feeding concentration were investigated. When the positive effect by the increase of open‐circuit voltage is greater than the negative effect caused by the increase of internal resistance, the electrical performance of RED stack is improved, and the maximum power density is increased. On the contrary, the value of maximum power density is decreased. The maximum power density reached its maximum when eight repeating units were used, and the optimum flow velocity was obtained as 0.71 cm/s. At a same concentration gradient of the feed, a lower internal resistance was observed at a higher total salinity, leading to better energy generation performance.