Analyze the effects of flow mode and humidity on PEMFC performance by equivalent membrane conductivity

Wei, Guanghua; Lu, Jiabin; Zhang, Qinglei; Zhu, Fengfeng; Yan, Xiaohui; Zhang, Junliang

doi:10.1002/er.4592

Cited by 11 publications

(6 citation statements)

References 31 publications

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“…It has been known that the unconsumed hydrogen discharged from the fuel cell stack carry the water vapor and liquid water (neglecting other inert gas). Assuming that the liquid water can be entirely separated by the separator, the secondary flow is wet hydrogen with a relative humidity of 100% 33 …”

Section: Ejector Designmentioning

confidence: 99%

“…Assuming that the liquid water can be entirely separated by the separator, the secondary flow is wet hydrogen with a relative humidity of 100%. 33 In the real systems, the temperature, pressure, and relative humidity usually change when the fuel cell stack works at different power conditions. Although the fixed operating conditions are used according to the above assumptions, the impact of different operating conditions on ejector performance is investigated in the section of results and discussion.…”

Section: Combination Of the Ejector And Mechanical Pump 20mentioning

confidence: 99%

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Performance investigation of a multi‐nozzle ejector for proton exchange membrane fuel cell system

et al. 2020

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Summary Due to its merit of no consuming energy, no moving part, and less requiring space, and maintenance, the ejector is one of the most promising hydrogen recirculation devices for proton exchange membrane fuel cell (PEMFC) applications. However, the prominent problem is its poor adaptability of the conventional ejector to meet the power range requirements of the PEMFC system. Thus, a multi‐nozzle ejector was investigated to widen the applicable power range of a PEMFC system. The designed multi‐nozzle ejector consists of one central nozzle (CN) and two symmetrical nozzles (SNs). The CN mode is activated under low power conditions, while the SNs mode is switched to adapt high power conditions. A 3D computational fluid dynamics (CFD) model was established to simulate the performance of ejectors, and an experimental test bench was built to validate the accuracy of the CFD model. The results indicated that the mixing chamber diameter (Dm) and throat tilt angle of SNs (αt) have a significant effect on the entrainment performance. It was found that the multi‐nozzle ejector can broaden the hydrogen supply range from 0.27 to 1.6 g/s (22‐100 kW) with the optimal combination of a Dm of 5.0 mm and αt of 8°. Nevertheless, the hydrogen supply range is 0.48 to 1.6 g/s (37‐100 kW) when using a conventional single‐nozzle ejector with a Dm of 5.0 mm. Moreover, the temperature, pressure, and relative humidity of the secondary flow have a great influence on the hydrogen entrainment ratio with the change of stack power.

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Section: Ejector Designmentioning

confidence: 99%

Section: Combination Of the Ejector And Mechanical Pump 20mentioning

confidence: 99%

Performance investigation of a multi‐nozzle ejector for proton exchange membrane fuel cell system

et al. 2020

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“…High efficiency and environmental benefits are characteristics that have made fuel cells attractive and powerful converters. Polymer membrane fuel cells (PEMFCs) are kinds of useful fuel cells that use a polymer membrane as an electrolyte . The PEMFCs have some important characteristics that make them different from the other fuel cells such as fast operation, high efficiency, and no contamination .…”

Section: Introductionmentioning

confidence: 99%

“…Polymer membrane fuel cells (PEMFCs) are kinds of useful fuel cells that use a polymer membrane as an electrolyte. 6,7 The PEMFCs have some important characteristics that make them different from the other fuel cells such as fast operation, high efficiency, and no contamination. [8][9][10][11][12][13][14] Recently, several theoretical and empirical techniques have been analyzed for PEMFCs.…”

Section: Introductionmentioning

confidence: 99%

Application of the meta‐heuristics for optimizing exergy of a HT‐PEMFC

Han

Khodaei

2020

Int J Energy Res

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Summary The aim of this study is to analyze the exergy efficiency of a high‐temperature proton exchange membrane fuel cell. To do this purpose, meta‐heuristic technique has been used. First, the model of a membrane fuel cell is simulated and the polarization diagram shows a potent agreement with empirical data. Then, a new improved version of collective animal behavior algorithm is utilized for evaluating and optimizing the thermodynamic irreversibility, exergy efficiency, and work of the fuel cell. The algorithm uses opposition‐based learning and Lévy flight for improving the algorithm's premature convergence shortcoming. The result of this study shows that by comparison with standard collective animal behavior algorithm, genetic algorithm, and empirical results, the proposed algorithm has better achievements for both terms of optimal value finding and convergence strength.

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“…Thus, reactant humidification provides the improved performance of the PEM‐FC under low humidification condition. Wei et al had studied the humidity effect and flow path on the PEM‐FC performance. They have used two different flow modes namely coflow and counter flow with different humidity conditions.…”

Section: Introductionmentioning

confidence: 99%

Effect of flow fields and humidification of reactant and oxidant on the performance of scaled‐up PEM‐FC using CFD code

Selvaraj

Rajagopal

2019

Int J Energy Res

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Summary The present study focuses on three‐dimensional two‐phase CFD investigation on scaled‐up proton exchange membrane fuel cell (PEM‐FC) for an active area of 100 cm2 with different designs of serpentine and parallel flow configuration. The humidification of hydrogen and oxygen is varied from 10% to 100% to study the PEM‐FC performance. The numerical results of polarization curves predicted in this study have been numerically validated with that of the literature for both parallel and counter serpentine flow channels with active area of 24.8‐cm2 PEM‐FC. Further upon validation, the numerical study is extended for scaled‐up PEM‐FC with active area of 100 cm2 with different flow path designs to study its performance characteristics namely polarization curves, species concentration distribution, water content in the membrane electrolyte, and proton conductivity to evaluate the fuel cell performance. The three‐dimensional CAD models are created in SOLIDWORKS 10.0 and are discretised hexahedrally using finite volume method. The various governing equations namely conservation of mass, momentum, energy, species concentration, and electrochemical equations are solved numerically with the necessary boundary conditions using the CFD code. The novel design of straight zigzag flow path shows the better performance output over the other designs investigated which is having a higher power density of 0.3711 W/cm2 for 100% relative humidity of reactant and oxidant.

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Analyze the effects of flow mode and humidity on PEMFC performance by equivalent membrane conductivity

Cited by 11 publications

References 31 publications

Performance investigation of a multi‐nozzle ejector for proton exchange membrane fuel cell system

Performance investigation of a multi‐nozzle ejector for proton exchange membrane fuel cell system

Application of the meta‐heuristics for optimizing exergy of a HT‐PEMFC

Effect of flow fields and humidification of reactant and oxidant on the performance of scaled‐up PEM‐FC using CFD code

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