Analysis and optimization of a new cylindrical air gap membrane distillation system

Shahu, Vandita T.; Thombre, Shashikant B.

doi:10.2166/ws.2019.164

Cited by 11 publications

(4 citation statements)

References 24 publications

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“…Then it was converted to a cylindrical model and the same was validated with a cylindrical AGMD system without the fins. The description of the CAGMD system can be found in the past study (Shahu and Thombre 2019b). Then the model was developed with the helical fins, and the same was validated with the experiments in the present study.…”

Section: Introductionmentioning

confidence: 94%

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Theoretical analysis and parametric investigation of an innovative helical air gap membrane desalination system

Shahu

Thombre

2022

Appl Water Sci

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A helical air gap membrane desalination (HAGMD) system is designed in the present study. The condenser is designed as a cylindrical shape with helical fins machined on the outer surface of a hollow copper condenser. A detailed theoretical model, studying heat and mass transfer in the HAGMD module, was developed. The theoretical model for a cylindrical system with fins is developed for the first time and is unique in the MD literature. Experimentation was carried out to examine the behavior of the HAGMD module under diverse design and operating conditions. The effect of cold flow rate, feed flow rate, feed temperature, the height of fins, the number of fins, and the length of the module is determined on the performance of the HAGMD system. Permeate flux and gained output ratio (GOR) were considered as the performance indicators of the system. Results showed that permeate flux increases with cold flow rate, feed temperature, feed flow rate, as well as number of fins, while the increase in height of fins negatively affects the flux. Theoretical model and experimental results are found to be in excellent agreement with only 6.7% of error which shows that the present theoretical model is excellent to predict the performance of any HAGMD system. For similar design parameters, the average flux increased by 135% for the finned HAGMD module, with 35 fins over the one with that only for 1 fin. Maximum experimental distillate flux is found to be 20 kg/m2 hr, and GOR is found to be 0.75.

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Section: Introductionmentioning

confidence: 94%

“…It was also shown that the temperature polarization constant could reach nearly unity for corrugated feed spacers. Shahu et al (2019b) demonstrated design flexibility for MD modules similar to the design of shell and tube heat exchangers. They developed a cylindrical AGMD module with a hollow copper condenser.…”

Section: Introductionmentioning

confidence: 99%

Theoretical analysis and parametric investigation of an innovative helical air gap membrane desalination system

Shahu

Thombre

2022

Appl Water Sci

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“…By changing the air gap depth, quantity, and structure of the finned tubes, the transmembrane flux of the membrane distillation process can be adjusted [ 25 ]. The cylindrical and spiral air gap membrane distillation configurations also have good vapor condensation effects [ 26 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

Finned Tubular Air Gap Membrane Distillation

Guo

2023

Membranes

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Finned tubular air gap membrane distillation is a new membrane distillation method, and its functional performance, characterization parameters, finned tube structures, and other studies have clear academic and practical application value. Therefore, the tubular air gap membrane distillation experiment modules composed of PTFE membrane and finned tubes were constructed in this work, and three representative air gap structures, including tapered finned tube, flat finned tube, and expanded finned tube, were designed. Membrane distillation experiments were carried out in the form of water cooling and air cooling, and the influences of air gap structures, temperature, concentration, and flow rate on the transmembrane flux were analyzed. The good water-treatment ability of the finned tubular air gap membrane distillation model and the applicability of air cooling for the finned tubular air gap membrane distillation structure were verified. The membrane distillation test results show that with the tapered finned tubular air gap structure, the finned tubular air gap membrane distillation has the best performance. The maximum transmembrane flux of the finned tubular air gap membrane distillation could reach 16.3 kg/m2/h. Strengthening the convection heat transfer between air and fin tube could increase the transmembrane flux and improve the efficiency coefficient. The efficiency coefficient (σ) could reach 0.19 under the condition of air cooling. Compared with the conventional air gap membrane distillation configuration, air cooling configuration for air gap membrane distillation is an effective way to simplify the system design and offers a potential way for the practical applications of membrane distillation on an industrial scale.

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“…The sources of lowtemperature such as waste heat and solar energy could be utilized efficiently by MD technology to warm the inlet feed saline solution. Compared with other MD technologies such as sweeping gas (SGMD) (Ajdar et al 2020), vacuum (VMD) (Shahu & Thombre, 2019), and direct contact membrane distillation (DCMD) (Damtie et al 2019), the air gap membrane distillation (AGMD) is deemed the best one in terms of having low heat loss and high thermal efficiency (Gao et al 2019;Abu-Zeid & ElMasry, 2020;Shahu & Thombre, 2020, 2021. However, the air gap region sandwiched between the membrane and cooling (condensing) plate decreased notably the productivity of pure drinkable water.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the Effect of Air and Permeate Gap Regions on Highly Saline Water Desalination Using Hollow Fiber Membrane Distillation Modules

Abu‐Zeid

2021

Journal of Soil Sciences and Agricultural Engineering

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The present research work discussed the impact of permeate gap region (PGR) on the high mass transfer resistance and low productivity resulted from the air gap region (AGR) sandwiched between the membrane and condensing surface in the air gap membrane distillation (AGMD). Two hollow fiber permeate gap (PGMD) and air gap membrane distillation (AGMD) modules were built, examined, and compared experimentally under several operating parameters such as feed salt concentration (Cf), feed temperature (Tf), coolant temperature (Tc), and flow rate (Mf). The performance comparison was done according to the values of energy consumption (STEC), water productivity (Pw), waste heat (QH.I), and gained output ratio (GOR). Results showed that the PGR was more effective than AGR on the membrane module performance at all investigated operating parameters. Under operating parameters of Cf = 7.5 g/L, Tc = 15 o C, Tf = 70 o C, Mf = 4 L/h, and compared with AGR, the PGR minimized STEC and QH.I by around 78.32% and 47.06%, and improved the Pw and GOR by about 95.93% and 90.33%, respectively. Thus, the negative gap region effect could vanish completely by filling it with the permeated water instead of air, promoting by which the performance of the membrane distillation module remarkably.

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Analysis and optimization of a new cylindrical air gap membrane distillation system

Cited by 11 publications

References 24 publications

Theoretical analysis and parametric investigation of an innovative helical air gap membrane desalination system

Theoretical analysis and parametric investigation of an innovative helical air gap membrane desalination system

Finned Tubular Air Gap Membrane Distillation

Comparison of the Effect of Air and Permeate Gap Regions on Highly Saline Water Desalination Using Hollow Fiber Membrane Distillation Modules

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