Direct contact membrane distillation for liquid desiccant regeneration and fresh water production: Experimental investigation, response surface modeling and optimization

Liu, Jingjing; Ren, Haoshan; Hai, Faisal I.; Albdoor, Ahmed K.; Li, Zhixiong

doi:10.1016/j.applthermaleng.2020.116293

Cited by 22 publications

(5 citation statements)

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“…A desiccant solution like LiCl that possesses good thermal and electrical conductivity has been used tremendously across different techniques. 150…”

Section: Non-thermal Liquid Desiccant Regeneration Techniquesmentioning

confidence: 99%

“…As thermal stability and conductivity of a desiccant solution is crucial to thermal regeneration technique, so is electric conductivity to non‐thermal techniques as ED and CDI. A desiccant solution like LiCl that possesses good thermal and electrical conductivity has been used tremendously across different techniques 150 …”

Section: Liquid Desiccant Regeneration Techniquesmentioning

confidence: 99%

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Desiccant solutions, membrane technologies, and regeneration techniques in liquid desiccant air conditioning system

2021

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Liquid desiccant air dehumidification has gained substantial attention recently due to its attractive energy-saving capability, high moisture retention, and low regeneration temperature. However, there are still unresolved limitations in liquid desiccant air conditioning systems (LDACs). Among on-going studies are the search for greener desiccant solvents, high-performance membrane, and regeneration techniques hybridization. This review discusses up-to-date development of the performance influential components of LDACs, such as desiccant properties, regeneration techniques, membranes, energy sources, and hybrid system configurations. The corrosive nature of conventional halide salt solutions, non-biodegradability and high viscosity property of most ionic liquids necessitate the search for alternative solvents in LDACs. Deep eutectic solvents (DES) properties, such as non-corrosive, hygroscopic, biodegradable, and low viscosity idealize promising alternative desiccant solutions. Therefore, DES may be usefully explored and further investigated in LDACs to establish the degree of their capacities in replacing conventional desiccants. Non-thermal regeneration techniques and nanoparticle enhanced membranes were also found to improve the overall energy performance of the LDAC system. Nonthermal regeneration techniques can operate below 40 C and reduce energy utilization between 10% and 50% in indoor space cooling. The coefficient of performance (COP) of this regeneration category is capable of being as high as 6, which is an indication of its promising energy-saving propensity. Highlights• Review on liquid desiccant materials and the potential of deep eutectic solvents as bio-desiccants for air dehumidification.

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“…A desiccant solution like LiCl that possesses good thermal and electrical conductivity has been used tremendously across different techniques. 150…”

Section: Non-thermal Liquid Desiccant Regeneration Techniquesmentioning

confidence: 99%

Section: Liquid Desiccant Regeneration Techniquesmentioning

confidence: 99%

Desiccant solutions, membrane technologies, and regeneration techniques in liquid desiccant air conditioning system

2021

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“…This waste heat can be utilized to power a process/desalination unit. There are several types of desalination technologies; however, membrane distillation (MD) is an emerging desalination technology that can be operated with low‐grade waste heat, 21 whereas direct‐contact membrane distillation (DCMD) is the widely researched and used configuration of MD 22 . Several studies have been conducted on waste‐heat driven MD process.…”

Section: Introductionmentioning

confidence: 99%

An investigation on simultaneous freshwater production and CO₂ capture using flue gas of a power plant

Soomro

Ullah

Khan³

2022

Greenhouse Gases

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This paper presents an investigation on simultaneous freshwater production and CO2 capture using the flue gases of a 500 MWe coal‐fired power plant. Generally, a fan/cooler is used to reduce the temperature of flue gas before flowing into the absorber column of a CO2 capture unit. It has been replaced with a heat exchanger in this study. Seawater and flue gas were passed through the heat exchanger to raise the temperature of seawater and reduce the temperature of flue gas. The high‐temperature seawater was subsequently fed into a membrane distillation (MD) unit for freshwater production. The cold flue gas was directed to the CO2 capture unit. The heat exchanger and CO2 capture unit were modeled with Aspen Plus software. Whereas MATLAB software was used to develop and solve the MD mathematical model software for freshwater production. The seawater flow rate was varied from 4000 L/min to 7000 L/min in the heat exchanger. As a result, the flue gas (flow rate 781.6 t/h) and the outlet seawater temperatures were reduced from 27.498 to 22.360°C and 73.384 to 52.670°C, respectively. However, higher inlet seawater temperature in the MD unit produced more freshwater. An increase in inlet seawater feed temperature in the MD unit from 52.670 to 73.384°C increased the freshwater production from 211,956.5 to 299,244 L/day. Furthermore, the CO2 capture process has been analyzed by varying the methyldiethanolamine (MDEA) and piperazine (PZ) concentrations in weight% (45 and 5, 40 and 10, 35 and 15, and 30 and 20, respectively). It was observed that the energy requirement reduced from 3.55 to 3.26 MJ/kg CO2 by increasing the PZ content from 5 to 20 wt.%. At 15 and 20 wt.% of PZ content in the blended solution of MDEA/PZ, the energy required to regenerate the solvent was 3.31 and 3.26 MJ/kg CO2, respectively. PZ emissions from the absorber were also increased with the raising of PZ content in the blended solution. The energy requirement was not much higher at 15 wt.% than 20 wt.%. Therefore, MDEA/PZ solution (15/35 wt.%) was considered an optimal concentration. The reboiler duty was reduced up to 3.25 MJ/kg CO2 at 15/35 wt.% concentration with stripper pressure of 2.3 bar. © 2022 Society of Chemical Industry and John Wiley & Sons, Ltd.

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“…The driving force for the transfer of water in the MD process is not the hydraulic and/or osmotic pressure difference but the water vapour pressure gradient induced by a temperature difference across the membrane. As a result, unlike pressure-driven membrane processes, MD is less subject to the salt concentration of the feed water, and hence it is workable with various hyper saline waters including concentrated brine from reverse osmosis (RO) desalination (Yan et al 2017;Bindels et al 2020), diluted draw solution from forward osmosis (FO) (Nguyen et al 2018), and liquid desiccant solutions used in air-conditioning industry Liu et al 2021).…”

Section: Introductionmentioning

confidence: 99%

“…Previous experimental works have been conducted to prove the technical feasibility of MD for the regeneration of liquid desiccant solutions used in the LDAC process Duong et al 2018;Lefers et al 2018;Zhou et al 2019;Liu et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Assessment of pilot direct contact membrane distillation regeneration of lithium chloride solution in liquid desiccant air-conditioning systems using computer simulation

Duong

Nghiem

Ansari

et al. 2021

Environ Sci Pollut Res

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Membrane distillation (MD) has been increasingly explored for treatment of various hyper saline waters, including lithium chloride (LiCl) solutions used in liquid desiccant airconditioning (LDAC) systems. In this study, the regeneration of liquid desiccant LiCl solution by a pilot direct contact membrane distillation (DCMD) process is assessed using computer simulation. Unlike previous experimental investigations, the simulation allows to incorporate both temperature and concentration polarisation effects in the analysis of heat and mass transfer through the membrane, thus enabling the systematic assessment of the pilot DCMD regeneration of the LiCl solution. The simulation results demonstrate distinctive profiles of water flux, thermal efficiency, and LiCl concentration along the membrane under co-current and counter-current flow modes, and the pilot DCMD process under counter-current flow is superior to that under co-current flow regarding the process thermal efficiency and LiCl concentration enrichment. Moreover, for the pilot DCMD regeneration of LiCl solution under the counter-current flow, the feed inlet temperature, LiCl concentration, and especially the membrane leaf length exert profound impacts on the process performance: the process water flux halves from 12 to 6 L/(m 2 h) while thermal efficiency decreases by 20% from 0.46 to 0.37 when the membrane leaf length increases from 0.5 to 1.5 m.

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Direct contact membrane distillation for liquid desiccant regeneration and fresh water production: Experimental investigation, response surface modeling and optimization

Cited by 22 publications

References 58 publications

Desiccant solutions, membrane technologies, and regeneration techniques in liquid desiccant air conditioning system

Desiccant solutions, membrane technologies, and regeneration techniques in liquid desiccant air conditioning system

An investigation on simultaneous freshwater production and CO₂ capture using flue gas of a power plant

Assessment of pilot direct contact membrane distillation regeneration of lithium chloride solution in liquid desiccant air-conditioning systems using computer simulation

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Direct contact membrane distillation for liquid desiccant regeneration and fresh water production: Experimental investigation, response surface modeling and optimization

Cited by 22 publications

References 58 publications

Desiccant solutions, membrane technologies, and regeneration techniques in liquid desiccant air conditioning system

Desiccant solutions, membrane technologies, and regeneration techniques in liquid desiccant air conditioning system

An investigation on simultaneous freshwater production and CO2 capture using flue gas of a power plant

Assessment of pilot direct contact membrane distillation regeneration of lithium chloride solution in liquid desiccant air-conditioning systems using computer simulation

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An investigation on simultaneous freshwater production and CO₂ capture using flue gas of a power plant