Development of a self-sustained model to predict the performance of direct contact membrane distillation

“…When the input energy power reached 10 000 W m –2 , the freshwater productivity obtained can also reach 15 kg m –2 h –1 . In addition, as Noamani et al pointed out, improving the membrane properties, such as increasing the pore size and porosity, reducing the membrane thickness and thermal conductivity, would further enhance the MD performance.…”

Section: Resultsmentioning

confidence: 99%

Numerical Simulation Study on the Mass and Heat Transfer in the Self-Heating Membrane Distillation Process

Huang

Tang

2021

Ind. Eng. Chem. Res.

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The self-heating membrane distillation (SHMD) process can achieve highly efficient membrane distillation due to local heating. However, limited by the observation methods, there are fewer research studies on the heat and mass transfer process in the SHMD. In this work, a two-dimensional (2D) computational fluid dynamic model coupling flow, thermal transfer, and vapor transport was developed. It revealed that the difference between the photothermal and Joule-heating membrane distillation (MD) was due to the different heat source positions. The water productivity first increased and then decreased in the feed linear velocity range of 1.25 × 10 −6 to 1.25 × 10 −1 m s −1 , which resulted from the comprehensive influence of temperature and salt concentration. In addition, the thermal efficiency was improved with increasing the input power due to the thermal concentration enhancement and the nonlinear relationship between the vapor and temperature. This work revealed the influence of temperature and salt concentration polarization in the SHMD, which can help to further improve the design of this process.

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“…Liquid-based technologies, including thermos-electrochemical cells (TECs), thermo-osmotic energy conversion (TOEC) systems, and thermally regenerative electrochemical cycles (TRECs), utilize low-grade heat resources to generate electricity. ,, The basis of the TOEC technology is the traditional direct contact membrane distillation (DCMD) process in which a temperature gradient drives vapor migration through a microporous hydrophobic membrane from a warm reservoir to a cold one. This leads to an osmotic pressure difference in the system, as represented in Figure A. , Like the PRO process, accumulated water in the cold chamber can be depressurized through an inline hydro turbine. Hence, some researchers refer to TOEC as “pressure retarded membrane distillation (PRMD)” .…”

Section: Thermo-osmotic Energy Conversion (Toec)mentioning

confidence: 99%

“…This leads to an osmotic pressure difference in the system, as represented in Figure 14A. 296,297 Like the PRO process, accumulated water in the cold chamber can be depressurized through an inline hydro turbine. Hence, some researchers refer to TOEC as "pressure retarded membrane distillation (PRMD)".…”

Section: Working Principlementioning

confidence: 99%

Harvesting Blue Energy Based on Salinity and Temperature Gradient: Challenges, Solutions, and Opportunities

Rastgar,

Moradi,

Burroughs

et al. 2023

Chem. Rev.

Self Cite

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Greenhouse gas emissions associated with power generation from fossil fuel combustion account for 25% of global emissions and, thus, contribute greatly to climate change. Renewable energy sources, like wind and solar, have reached a mature stage, with costs aligning with those of fossil fuel-derived power but suffer from the challenge of intermittency due to the variability of wind and sunlight. This study aims to explore the viability of salinity gradient power, or “blue energy”, as a clean, renewable source of uninterrupted, base-load power generation. Harnessing the salinity gradient energy from river estuaries worldwide could meet a substantial portion of the global electricity demand (approximately 7%). Pressure retarded osmosis (PRO) and reverse electrodialysis (RED) are more prominent technologies for blue energy harvesting, whereas thermo-osmotic energy conversion (TOEC) is emerging with new promise. This review scrutinizes the obstacles encountered in developing osmotic power generation using membrane-based methods and presents potential solutions to overcome challenges in practical applications. While certain strategies have shown promise in addressing some of these obstacles, further research is still required to enhance the energy efficiency and feasibility of membrane-based processes, enabling their large-scale implementation in osmotic energy harvesting.

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Development of a self-sustained model to predict the performance of direct contact membrane distillation

Cited by 18 publications

References 59 publications

Superhydrophobic PVDF membrane formed by crystallization process for direct contact membrane distillation

Superhydrophobic PVDF membrane formed by crystallization process for direct contact membrane distillation

Numerical Simulation Study on the Mass and Heat Transfer in the Self-Heating Membrane Distillation Process

Harvesting Blue Energy Based on Salinity and Temperature Gradient: Challenges, Solutions, and Opportunities

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