Effective thermal conductivity and thermal contact resistance of gas diffusion layers in proton exchange membrane fuel cells. Part 2: Hysteresis effect under cyclic compressive load

Sadeghi, Ehsan; Djilali, Ned; Bahrami, Majid

doi:10.1016/j.jpowsour.2010.07.051

Cited by 69 publications

(48 citation statements)

References 20 publications

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“…More recently, also the effect of load cycling -i.e. cycles of increasing compression up to a maximum value and releasing compression to 0 -was investigated and steady-state (in the investigated case reached after 5 cycles) properties were determined (Sadeghi et al, 2010). Further, it was found that residual water in the GDL leads to a significant increase of through-plane thermal conductivity (Burheim et al, 2010;Burheim et al, 2011).…”

Section: D Structurementioning

confidence: 99%

Computation of Thermal Conductivity of Gas Diffusion Layers of PEM Fuel Cells

Pfrang¹,

Veyret²,

Tsotridis³

2011

Convection and Conduction Heat Transfer

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Section: D Structurementioning

confidence: 99%

Computation of Thermal Conductivity of Gas Diffusion Layers of PEM Fuel Cells

Pfrang¹,

Veyret²,

Tsotridis³

2011

Convection and Conduction Heat Transfer

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“…The PTL used in a PEMFC system today is typically much more 288 elastic [44] conductivity with high precision [20]. In this perspective we can only expect that the present study will 307 obtain some qualitative results when it comes to determining the thermal conductivity of CLs containing 308 liquid water.…”

mentioning

confidence: 90%

Thermal conductivity and temperature profiles in carbon electrodes for supercapacitors

Burheim

Aslan

Atchison

et al. 2014

Journal of Power Sources

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7In this study thermal conductivities of Polymer Electrolyte Membrane Fuel Cell (PEMFC) Catalyst Layers 8 (CLs) were measured. The CLs were fabricated on a thin copper metal film, varied in composition and 9 measured both when dry and in the presence of residual water. In order to demonstrate and evaluate the 10 impact and relevance of the measurements, a 1-D thermal model was developed. 11It was found that dry CLs, and CLs containing very small water content, had thermal conductivity values water up to 70 moles of water per mole of sulphonic group, it was observed that the water only had an effect 14 on the thermal conductivity with values much higher than those reported as the capacity of the ionomer. 15The literature suggests, depending on the CL, that the ionomer of a CL can carry up to around 10 moles 16 of water per sulphonic group and that water content beyond this level is carried otherwise. We found that When considering wet porous transport layers (PTL) and moderately humidified CL, the PEMFC maximum 24 internal temperature difference increased by 33% when compared to the commonly assumed measured 25 thermal conductivities. Considering that the CL constitute less than 10% of the total PEMFC thickness 26 * Corresponding author; measurements and modelling. * * Corresponding author; catalyst layer sample preparation and development.

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“…The thermal conductivity of the GDLs has strong influence on the membrane temperature and hence on activation losses or the current distribution, indicating a significant role played by lateral heat conduction [55]. In recent years a number of researchers have investigated the GDL thermal conductivity [52,53,[55][56][57][58][59][60][61].…”

Section: Heat Generationmentioning

confidence: 99%

“…As compression increases, the thermal contact resistance decreases resulting in a sharp increase in the thermal conductivity of both treated and untreated carbon paper. Sadeghi et al studied the effects of cyclic compression on the GDL thermal and structural properties under vacuum conditions [59]. The load cycling in the experiments was continued until the loading and unloading data coincided.…”

Section: Heat Generationmentioning

confidence: 99%

“…Detailed knowledge on the in-situ temperature distribution in a PEMFC is essential for water and thermal management and optimization of the cell performance and durability. Although the measured through-plane thermal conductivities can be used in models to predict the temperature distribution across the PEMFC, the information on the in-plane thermal conductivities are essential to improve the accuracy of the models and to reduce discrepancies with the experimental data [59]. The heat transfer due to the release of latent heat during condensation is enhanced by the flow of vapour from the reaction sites and its condensation in the GDL.…”

Section: Heat Generationmentioning

confidence: 99%

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Review on management, mechanisms and modelling of thermal processes in PEMFC

Bvumbe¹,

Bujło²,

Tolj³

et al. 2016

Hydrogen and Fuel Cells

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Abstract:In an effort to reduce the environmental impact of the energy sector that is mostly based on fossil fuels, researchers are looking for a clean alternative of our existing energy sources. Hydrogen Energy and Fuel Cells, and in particular Polymer Electrolyte Membrane Fuel Cells (PEMFCs) have emerged as a leading candidate for transportation as well as stationary and portable applications. Due to the irreversibility of the electrochemical reactions and ohmic heating in the fuel cell components, the PEMFC produces a significant amount of heat and this heat has to be removed in order to avoid cell or stack overheating. In this paper, a review of the key heat transfer mechanisms and the various cooling strategies that are available for heat removal from PEMFCs are presented. Due to the interrelated nature and difficulty of conducting in-situ thermal measurements on the operating PEMFCs, computational modelling provides a fast and efficient way of designing PEMFC cooling systems and understanding the heat transfer mechanisms. Therefore PEMFC thermal modelling is also highlighted together with present challenges and potential areas for further research and development works.

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Effective thermal conductivity and thermal contact resistance of gas diffusion layers in proton exchange membrane fuel cells. Part 2: Hysteresis effect under cyclic compressive load

Cited by 69 publications

References 20 publications

Computation of Thermal Conductivity of Gas Diffusion Layers of PEM Fuel Cells

Computation of Thermal Conductivity of Gas Diffusion Layers of PEM Fuel Cells

Thermal conductivity and temperature profiles in carbon electrodes for supercapacitors

Review on management, mechanisms and modelling of thermal processes in PEMFC

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