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Cooling Design for PEM Fuel-Cell Stacks Employing Air and Metal Foam: Simulation and Experiment

Author

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  • Ali A. Hmad

    (Department of Mechanical Engineering, University of Detroit Mercy, 4001 W. McNichols Rd., Detroit, MI 48221, USA)

  • Nihad Dukhan

    (Department of Mechanical Engineering, University of Detroit Mercy, 4001 W. McNichols Rd., Detroit, MI 48221, USA)

Abstract

A new study investigating the cooling efficacy of air flow inside open-cell metal foam embedded in aluminum models of fuel-cell stacks is described. A model based on a commercial stack was simulated and tested experimentally. This stack has three proton exchange membrane (PEM) fuel cells, each having an active area of 100 cm 2 , with a total output power of 500 W. The state-of-the-art cooling of this stack employs water in serpentine flow channels. The new design of the current investigation replaces these channels with metal foam and replaces the actual fuel cells with aluminum plates. The constant heat flux on these plates is equivalent to the maximum heat dissipation of the stack. Forced air is employed as the coolant. The aluminum foam used had an open-pore size of 0.65 mm and an after-compression porosity of 60%. Local temperatures in the stack and pumping power were calculated for various air-flow velocities in the range of 0.2–1.5 m/s by numerical simulation and were determined by experiments. This range of air speed corresponds to the Reynolds number based on the hydraulic diameter in the range of 87.6–700.4. Internal and external cells of the stack were investigated. In the simulations, and the thermal energy equations were solved invoking the local thermal non-equilibrium model—a more realistic treatment for airflow in a metal foam. Good agreement between the simulation and experiment was obtained for the local temperatures. As for the pumping power predicted by simulation and obtained experimentally, there was an average difference of about 18.3%. This difference has been attributed to the poor correlation used by the CFD package (ANSYS) for pressure drop in a metal foam. This study points to the viability of employing metal foam for cooling of fuel-cell systems.

Suggested Citation

  • Ali A. Hmad & Nihad Dukhan, 2021. "Cooling Design for PEM Fuel-Cell Stacks Employing Air and Metal Foam: Simulation and Experiment," Energies, MDPI, vol. 14(9), pages 1-19, May.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:9:p:2687-:d:550122
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    References listed on IDEAS

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    Cited by:

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    2. Wei Wang & Liang Ding & Fangming Han & Yong Shuai & Bingxi Li & Bengt Sunden, 2022. "Parametric Study on Thermo-Hydraulic Performance of NACA Airfoil Fin PCHEs Channels," Energies, MDPI, vol. 15(14), pages 1-15, July.
    3. Hossein Pourrahmani & Hamed Shakeri & Jan Van herle, 2022. "Thermoelectric Generator as the Waste Heat Recovery Unit of Proton Exchange Membrane Fuel Cell: A Numerical Study," Energies, MDPI, vol. 15(9), pages 1-21, April.
    4. Aidar Khairullin & Aigul Haibullina & Alex Sinyavin & Denis Balzamov & Vladimir Ilyin & Liliya Khairullina & Veronika Bronskaya, 2022. "Heat Transfer in 3D Laguerre–Voronoi Open-Cell Foams under Pulsating Flow," Energies, MDPI, vol. 15(22), pages 1-26, November.

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