Thermal analysis evaluation of direct contact membrane distillation system

Elmarghany, Mohamed R.; El-Shazly, A.H.; Salem, Mohamed S.; Sabry, Mohamed; Nady, Norhan

doi:10.1016/j.csite.2018.100377

Cited by 71 publications

(23 citation statements)

References 35 publications

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“…As the temperature is increased, there is a greater difference between the feed and ambient temperature causing more heat to be lost to the environment. Elmarghany et al recently reported similar findings in their study of the thermal analysis of DCMD systems [24]. Our results show that an SEC reduction of greater than 50% is observed between 0V and 24V at all three feed temperatures.…”

Section: Resultssupporting

confidence: 88%

Enhanced performance of direct contact membrane distillation via selected electrothermal heating of membrane surface

Ahmed

Lalia

Hashaikeh

et al. 2020

Journal of Membrane Science

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Membrane distillation (MD) is a thermally driven separation process with great potential, but is currently limited by low energy efficiency. Heating of the entire circulating feed represents a major source of energy consumption in MD. Here, we present electrically conductive carbon nanostructure (CNS-) coated polypropylene (PP) membranes as a possible candidate to mitigate energy consumption through selected electrothermal heating of the membrane surface. A membrane for MD was coated with CNS using a tape casting technique. The resulting CNS-PP membrane is hydrophobic, and its smaller pore size and narrow pore size distribution resulted in a higher liquid entry pressure compared to the uncoated PP membrane. An increase in surface temperature was observed when a current was passed through the conductive CNS layer. The CNS layer on the PP membrane acts as an electrothermal heater when an AC potential is applied, and the rate of heating is proportional to the amplitude of applied AC potential. We applied electrothermal heating of these membranes to desalination by direct contact membrane distillation, in conjunction with heating of the circulating feed, and compared the performance with and without application of AC bias at three feed temperatures viz. 40, 50 and 60 °C. Applying a potential across the CNS layer increased permeate flux by 75, 76 and 61% at feed temperatures of 40, 50 and 60 °C respectively, while maintaining a salt rejection of >99%. This increase in flux is accompanied by a reduction in specific energy consumption of greater than 50% for all three feed temperatures. By combining electrothermal surface heating with MD, this study paves the way for smart, low-energy MD systems.

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Section: Resultssupporting

confidence: 88%

Enhanced performance of direct contact membrane distillation via selected electrothermal heating of membrane surface

Ahmed

Lalia

Hashaikeh

et al. 2020

Journal of Membrane Science

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“…There are some parameters related to the electrospinning, which can affect the morphology of the prepared nanofibers, and they are divided into three groups: solution characteristics, spinning environment, and spinning conditions [5,42,43]. Electrospinning with and without multi-nozzle systems have been used to fabricate nanofiber membranes for the applications of MD [33,44]. Electrospun nanofibers have been obtained using many hydrophobic polymers such as PVDF and PcH [45][46][47].…”

Section: Introductionmentioning

confidence: 99%

Triple-Layer Nanocomposite Membrane Prepared by Electrospinning Based on Modified PES with Carbon Nanotubes for Membrane Distillation Applications

et al. 2020

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In this work, a novel triple-layer nanocomposite membrane prepared with polyethersulfone (PES)/carbon nanotubes (CNTs) as the primary bulk material and poly (vinylidene fluoride-co-hexafluoro propylene) (PcH)/CNTs as the outer and inner surfaces of the membrane by using electrospinning method is introduced. Modified PES with CNTs was chosen as the bulk material of the triple-layer membrane to obtain a high porosity membrane. Both the upper and lower surfaces of the triple-layer membrane were coated with PcH/CNTs using electrospinning to get a triple-layer membrane with high total porosity and noticeable surface hydrophobicity. Combining both characteristics, next to an acceptable bulk hydrophobicity, resulted in a compelling membrane for membrane distillation (MD) applications. The prepared membrane was utilized in a direct contact MD system, and its performance was evaluated in different salt solution concentrations, feed velocities and feed solution temperatures. The results of the prepared membrane in this study were compared to those reported in previously published papers. Based on the evaluated membrane performance, the triple-layer nanocomposite membrane can be considered as a potential alternative with reasonable cost, relative to other MD membranes.

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“…The numerical evaluations of the dynamic SEC for the concentration process of YPFS extract by MD are shown in Figure 11, using both experimental and modelling calculation approaches. These energy estimations were validated by cross checking with literature data (1037 to 2064 kWh/m 3 ) from a published work on thermal analysis of DCMD system [59].…”

Section: Energy Consumption Evaluation For MDmentioning

confidence: 97%

Traditional Chinese Medicine Extract Properties Incorporated Energy Analysis for Membrane Concentration Processes

Guo

et al. 2021

Membranes

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This work focuses on the energy analysis of the membrane concentration systems that process traditional Chinese medicine extracts with dynamic properties incorporated, particularly for reverse osmosis (RO) and membrane distillation (MD) processes. The evaluation of process energy consumption was achieved by integrating the empirical properties correlations of Brix and other characteristics properties of the feed (e.g., density and heat capacity). The dynamic SEC analysis for RO process was largely dependent on the feed pressure, reported at 50 kWh/m3 at feed pressure of 0.9 MPa with less than 50% water removal. The occurrence of foaming at above 50% water removal caused discrepancies between the simulated flux results and the experimentally acquired results in RO, whereas the estimated dynamic SEC for MD process did not show a strong correlation with the temperatures selected in this study, ranging from 900 to 1000 kWh/m3. This approach can be adapted into the design and zoptimization for the concentration process of other herbal extracts by membrane technologies, allowing comprehensive understanding into the energy analysis in future study.

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Thermal analysis evaluation of direct contact membrane distillation system

Cited by 71 publications

References 35 publications

Enhanced performance of direct contact membrane distillation via selected electrothermal heating of membrane surface

Enhanced performance of direct contact membrane distillation via selected electrothermal heating of membrane surface

Triple-Layer Nanocomposite Membrane Prepared by Electrospinning Based on Modified PES with Carbon Nanotubes for Membrane Distillation Applications

Traditional Chinese Medicine Extract Properties Incorporated Energy Analysis for Membrane Concentration Processes

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