Numerical modeling of fluid flow and coupled heat and mass transfer in a counter-cross-flow parallel-plate liquid-to-air membrane energy exchanger

Vali, Alireza; Ge, Gaoming; Besant, Robert W.; Simonson, Carey J.

doi:10.1016/j.ijheatmasstransfer.2015.06.043

Cited by 52 publications

(12 citation statements)

References 32 publications

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“…Reynoldsnumber (Re) (Vali et al, 2015) is an important parameter for simulation; in this study, this variable was calculated with Eq. et al, 2010).…”

Section: Numerical Solutionmentioning

confidence: 99%

Numerical Simulation of Gas Exchange in Fresh-keeping Transportation Containers with a Controlled Atmosphere

Lü

Wang

et al. 2016

FSTR

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“…Reynoldsnumber (Re) (Vali et al, 2015) is an important parameter for simulation; in this study, this variable was calculated with Eq. et al, 2010).…”

Section: Numerical Solutionmentioning

confidence: 99%

Numerical Simulation of Gas Exchange in Fresh-keeping Transportation Containers with a Controlled Atmosphere

Lü

Wang

et al. 2016

FSTR

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“…They found to be the most crucial parameter affecting the system effectiveness. Vali et al [22] studied a counter-cross LAMEE by investigating the effects of aspect and entrance ratios through numerical modelling, and discovered that the counter-cross-flow configuration would have the same performance as the counter-flow configuration if the membrane surface area is enlarged by 10%. Moghaddam et al [23] introduced a solution-side effectiveness to evaluate the impact of * on dehumidification and regeneration processes, and pointed out that the latent effectiveness difference between the air-side and the solution-side is can be neglected.…”

Section: Introductionmentioning

confidence: 99%

Influences of the mixed LiCl-CaCl2 liquid desiccant solution on a membrane-based dehumidification system: Parametric analysis and mixing ratio selection

Bai¹,

Zhu²,

Chu³

et al. 2019

Energy and Buildings

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The membrane-based liquid desiccant dehumidification system has high energy efficiency without the traditional liquid system carry-over problem. The performance of such a system strongly depends on solution's temperature and concentration, which have direct relationship to the solution surface vapour pressure. Compared with the pure liquid desiccant solution, the mixed liquid desiccant solution has lower surface vapour pressure, better system performance and lower material cost. In this paper, the performance of a flat-plate membrane-based liquid desiccant dehumidification system with the mixed solution (LiCl and CaCl2) is investigated through theoretical and experimental approaches. A mathematical model is established to predict the system performance, while the electrolyte non-random two-liquid (NRTL) method is applied to calculate the mixed solution properties. The influences of the solution mixing ratio, temperature and concentration are evaluated, and it is found that the regeneration heat can be dramatically reduced by either applying a high concentration solution or increasing CaCl2 content in the mixed solution. Compared with the pure LiCl solution system, the mixed solution system COP can be improved up to 30.23% by increasing CaCl2 content for a 30% concentration solution. The optimum mixing ratio varies with the solution concentration. For the mixed LiCl-CaCl2 solution, the system highest COPs appear at the mixing ratios of 3:1, 2:1 and 1:1 for 20%, 30% and 40% concentrations respectively.

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“…They focused on the effects of different 97 operating parameters on the system overall energy performance and revealed that the system 98 COP at the design condition is 0.68, while the sensible heat ratio (the ratio of the sensible to 99 total energy removed from the supply air) is in the range of 0.3 to 0.5 under different climatic, operating and design conditions. Vali et al [17] developed a numerical model to evaluate the performance of a counter-cross LAMEE by considering effect of the system design parameters, such as aspect ratio and entrance ratio. They found that the effectiveness is in the range between the effectiveness of pure counter-flow and pure cross-flow LAMEEs with the same membrane area, and the counter-cross-flow LAMEE would have the same performance as a counter-flow LAMEE when the membrane area of practical design is increased by 10%.…”

Section: Introductionmentioning

confidence: 99%

“…As discussed previously, many experimental studies have been carried out to investigate the performance of the membrane-based system [3,[12][13][14][15]30]. A few studies evaluate the performance of liquid desiccant system numerically [12][13][14][15][16][17] by examining the effects of several operating and design parameters on the effectiveness of LAMEE or the overall energy performance. Several numerical investigations [18-20, 31, 32] used models that solve momentum equation and continuity equation to obtain velocity field, energy and mass equation to obtain concentration and temperature distributions.…”

Section: Introductionmentioning

confidence: 99%

Parametric analysis of a cross-flow membrane-based parallel-plate liquid desiccant dehumidification system: Numerical and experimental data

Bai

Zhu

Chen

et al. 2018

Energy and Buildings

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Operating parameters of a membrane-based parallel-plate liquid desiccant dehumidification system are investigated in this paper. The liquid desiccant and air are in a cross-flow arrangement, and separated by semi-permeable membranes to avoid carry-over problem. A numerical model is developed to simulate the system performance, and validated by experimental and analytical results. Impacts of main operating parameters on the system performance (i.e. sensible, latent and total effectiveness) are evaluated, which include dimensionless parameters (i.e. solution to air mass flow rate ratio * and number of heat transfer units ), solution properties (i.e. concentration and temperature ) and inlet air conditions (i.e. temperature , and relative humidity , ). It is found that * and are two of the most important parameters influencing the system effectiveness. Even though the system performance can be improved by * and , its increasing gradient is limited when * and exceed 1 and 4 respectively. Decreasing solution temperature does not make a great improvement to the system performance, however, increasing solution concentration is a good approach to enhance the latent effectiveness without influencing the sensible effectiveness. The system shows the broad adaptability in various weather conditions, and has the ability to provide relative stable state supply air.

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Numerical modeling of fluid flow and coupled heat and mass transfer in a counter-cross-flow parallel-plate liquid-to-air membrane energy exchanger

Cited by 52 publications

References 32 publications

Numerical Simulation of Gas Exchange in Fresh-keeping Transportation Containers with a Controlled Atmosphere

Numerical Simulation of Gas Exchange in Fresh-keeping Transportation Containers with a Controlled Atmosphere

Influences of the mixed LiCl-CaCl2 liquid desiccant solution on a membrane-based dehumidification system: Parametric analysis and mixing ratio selection

Parametric analysis of a cross-flow membrane-based parallel-plate liquid desiccant dehumidification system: Numerical and experimental data

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