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dc.contributor.authorYuan, Ziwenen_US
dc.contributor.authorWei, Lien_US
dc.contributor.authorAfroze, Jannatul Dilen_US
dc.contributor.authorGoh, Kunlien_US
dc.contributor.authorChen, Yumaoen_US
dc.contributor.authorYu, Yanxien_US
dc.contributor.authorShe, Qianhongen_US
dc.contributor.authorChen, Yuanen_US
dc.identifier.citationYuan, Z., Wei, L., Afroze, J. D., Goh, K., Chen, Y., Yu, Y., She, Q. & Chen, Y. (2019). Pressure-retarded membrane distillation for low-grade heat recovery : the critical roles of pressure-induced membrane deformation. Journal of Membrane Science, 579, 90-101.
dc.description.abstractPressure-retarded membrane distillation (PRMD) is an emerging membrane process to recover energy from low-grade heat sources. The applied hydraulic pressure on the cold-water side in PRMD may strongly affect both energy conversion efficiency and membrane performance. Here, we report the first systematic study on this critical issue. A commercial nanoporous polytetrafluoroethylene membrane was evaluated as a general membrane sample over a range of applied pressures from 0 to 10 bar at a temperature difference of 40 °C. Our results show that the theoretically projected constant water vapor flux decreases significantly with the increase of the applied pressures, which can be attributed to the severe membrane deformation induced by pressures. The membrane in the active-layer-facing-hot-solution orientation is mechanically unstable with the complete loss of water vapor flux under 2 bar. In contrast, the membrane in the active-layer-facing-cold-solution orientation can still work under 10 bar. Combining theoretical analysis and detailed characterization of membrane physical structures, we show that the properties of membrane active layers (i.e., pore size, porosity, and thickness) deteriorate under elevated pressures. Deformed membranes have lower permeability and higher temperature polarization in PRMD, resulting in the observed lower water vapor fluxes. Our results suggest that improving the mechanical stability of membranes would be the first critical step in realizing practical applications of PRMD for low-grade heat recovery. Potential research directions for developing novel PRMD membranes are also proposed.en_US
dc.relation.ispartofJournal of Membrane Scienceen_US
dc.rights© 2019 Elsevier B.V. All rights reserved.en_US
dc.subjectEngineering::Chemical engineeringen_US
dc.titlePressure-retarded membrane distillation for low-grade heat recovery : the critical roles of pressure-induced membrane deformationen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Chemical and Biomedical Engineeringen_US
dc.subject.keywordsPressure-retarded Membrane Distillationen_US
dc.subject.keywordsLow-grade Heat Recoveryen_US
dc.subject.keywordsMembrane Deformationen_US
dc.description.acknowledgementThe authors thank funding support from Australian Research Council under the Future Fellowships scheme (FT160100107), Discovery Programme (DP180102210).en_US
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