Study on the heat and mass transfer in AGMD module with latent heat recovery

Geng, Hongxin; Liu, Lin; Li, Pingli; Zhang, Chunyao; Chang, Ho

doi:10.1080/19443994.2015.1074122

Cited by 12 publications

(3 citation statements)

References 24 publications

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“…With increment of FFR, the value of GOR decreases. The reason for this reduction is the reduction of residence time that results in lower sensible heat transfer from feed fluid to the cold stream and therefore lower GOR (Geng et al 2014(Geng et al , 2016.…”

Section: Effect Of Operating Parameters On Gormentioning

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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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: Effect Of Operating Parameters On Gormentioning

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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“…Researches [10,62,[104][105][106]112,206,[208][209][210] showed that increasing feed temperature could increase the interfacial temperature adjacent to the membrane surface at the feed side and alleviate temperature polarization. Many studies [19,119,132,[211][212][213] demonstrated that water flux increased exponentially with the increase of feed temperatures according to the Antoine equation. In addition, the profile of temperature from liquid/membrane interface (T 1 ) to membrane/liquid interface (T 2 ) shows that it declines exponentially across the membrane [214].…”

Section: Temperaturementioning

confidence: 99%

Interplay of the Factors Affecting Water Flux and Salt Rejection in Membrane Distillation: A State-of-the-Art Critical Review

Chen

Wang

2020

Water

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High water flux and elevated rejection of salts and contaminants are two primary goals for membrane distillation (MD). It is imperative to study the factors affecting water flux and solute transport in MD, the fundamental mechanisms, and practical applications to improve system performance. In this review, we analyzed in-depth the effects of membrane characteristics (e.g., membrane pore size and distribution, porosity, tortuosity, membrane thickness, hydrophobicity, and liquid entry pressure), feed solution composition (e.g., salts, non-volatile and volatile organics, surfactants such as non-ionic and ionic types, trace organic compounds, natural organic matter, and viscosity), and operating conditions (e.g., temperature, flow velocity, and membrane degradation during long-term operation). Intrinsic interactions between the feed solution and the membrane due to hydrophobic interaction and/or electro-interaction (electro-repulsion and adsorption on membrane surface) were also discussed. The interplay among the factors was developed to qualitatively predict water flux and salt rejection considering feed solution, membrane properties, and operating conditions. This review provides a structured understanding of the intrinsic mechanisms of the factors affecting mass transport, heat transfer, and salt rejection in MD and the intra-relationship between these factors from a systematic perspective.

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“…Desalination is a promising method that can potentially reduce the water shortage crisis by the production of freshwater from seawater. − Current desalination processes can be divided into two main categories: (1) thermal processes such as multistage flash distillation, multieffect desalination, and vapor compression distillation − and (2) membrane separation processes such as reverse osmosis (RO), electrodialysis, and membrane distillation (MD). − MD is a thermally driven separation process in which hot liquid contaminated feed solution flows with direct contact to the membrane surface on the feed side, and cold, pure water stream flows on the other side of the membrane in the permeate side. The driving force of the MD process is the temperature difference across the membrane, which results in a partial vapor pressure gradient.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Air-Gap Membrane Distillation and Comparative Study with Direct Contact Membrane Distillation

Noamani

Niroomand

Rastgar

et al. 2020

Ind. Eng. Chem. Res.

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Most of the developed models for the air-gap membrane distillation (AGMD) process are one-dimensional and rely on experimentally determined parameters. Herein, inspired by the effectiveness-number of transfer units method for the design of heat exchangers, a new approach of theoretical model is developed based on mass and heat transfer mechanisms in the AGMD process by considering the temperature variation in two dimensions. The results of our self-sustained model match well with the AGMD experimental results, with less than 4% deviation. Using the developed model, the AGMD performance is systematically investigated in terms of permeate flux, energy efficiency, and temperature and concentration polarization effects, and the results are compared with direct contact membrane distillation (DCMD). The results showed that the feed temperature had the most significant impact on the permeate flux and energy efficiency. The thickness of the air-gap and the flow rate were found to be the second most effective parameters. In contrast, the membrane thermal conductivity and porosity did not play a determining role. A 60% increase in the feed temperature increased the permeate flux and energy efficiency by 200 and 2%, respectively. By increasing the flow rate from 0.2 to 8 liters per minute, the permeate flux was enhanced by 67.19%. The air-gap thickness increment from 0.6 to 5.6 mm caused a 36.8% reduction in the permeate flux. In our comparative study, the permeate flux and the gained output ratio for DCMD were 56.6 and 27.3% higher as compared to AGMD at the same conditions. However, the thermal efficiency of the AGMD process was 24.7% larger than that of the DCMD process. The developed model provides solutions to minimize the undesirable effects of temperature and concentration polarization and proposes an optimum design map to achieve higher energy efficiency and permeate flux.

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Study on the heat and mass transfer in AGMD module with latent heat recovery

Cited by 12 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

Interplay of the Factors Affecting Water Flux and Salt Rejection in Membrane Distillation: A State-of-the-Art Critical Review

Modeling of Air-Gap Membrane Distillation and Comparative Study with Direct Contact Membrane Distillation

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