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The Impact of Active and Passive Thermal Management on the Energy Storage Efficiency of Metal Hydride Pairs Based Heat Storage

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  • Serge Nyallang Nyamsi

    (South African Institute for Advanced Materials Chemistry, University of the Western Cape, Private Bag X17, Bellville 7535, South Africa)

  • Ivan Tolj

    (Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, University of Split, R Boskovica 32, 21000 Split, Croatia)

Abstract

Two-tank metal hydride pairs have gained tremendous interest in thermal energy storage systems for concentrating solar power plants or industrial waste heat recovery. Generally, the system’s performance depends on selecting and matching the metal hydride pairs and the thermal management adopted. In this study, the 2D mathematical modeling used to investigate the heat storage system’s performance under different thermal management techniques, including active and passive heat transfer techniques, is analyzed and discussed in detail. The change in the energy storage density, the specific power output, and the energy storage efficiency is studied under different heat transfer measures applied to the two tanks. The results showed that there is a trade-off between the energy storage density and the energy storage efficiency. The adoption of active heat transfer enhancement (convective heat transfer enhancement) leads to a high energy storage density of 670 MJ m −3 (close to the maximum theoretical value of 755.3 MJ m −3 ). In contrast, the energy storage efficiency decreases dramatically due to the increase in the pumping power. On the other hand, passive heat transfer techniques using the bed’s thermal conductivity enhancers provide a balance between the energy storage density (578 MJ m −3 ) and the energy efficiency (74%). The utilization of phase change material as an internal heat recovery medium leads to a further reduction in the heat storage performance indicators (142 MJ m −3 and 49%). Nevertheless, such a system combining thermochemical and latent heat storage, if properly optimized, can be promising for thermal energy storage applications.

Suggested Citation

  • Serge Nyallang Nyamsi & Ivan Tolj, 2021. "The Impact of Active and Passive Thermal Management on the Energy Storage Efficiency of Metal Hydride Pairs Based Heat Storage," Energies, MDPI, vol. 14(11), pages 1-24, May.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:11:p:3006-:d:559973
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    References listed on IDEAS

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    1. Li, Xiaolei & Xu, Ershu & Song, Shuang & Wang, Xiangyan & Yuan, Guofeng, 2017. "Dynamic simulation of two-tank indirect thermal energy storage system with molten salt," Renewable Energy, Elsevier, vol. 113(C), pages 1311-1319.
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    3. Paskevicius, M. & Sheppard, D.A. & Williamson, K. & Buckley, C.E., 2015. "Metal hydride thermal heat storage prototype for concentrating solar thermal power," Energy, Elsevier, vol. 88(C), pages 469-477.
    4. Zhao, Bing-chen & Cheng, Mao-song & Liu, Chang & Dai, Zhi-min, 2017. "Cyclic thermal characterization of a molten-salt packed-bed thermal energy storage for concentrating solar power," Applied Energy, Elsevier, vol. 195(C), pages 761-773.
    5. Serge Nyallang Nyamsi & Mykhaylo Lototskyy & Ivan Tolj, 2020. "Optimal Design of Combined Two-Tank Latent and Metal Hydrides-Based Thermochemical Heat Storage Systems for High-Temperature Waste Heat Recovery," Energies, MDPI, vol. 13(16), pages 1-18, August.
    6. Serge Nyallang Nyamsi & Ivan Tolj & Mykhaylo Lototskyy, 2019. "Metal Hydride Beds-Phase Change Materials: Dual Mode Thermal Energy Storage for Medium-High Temperature Industrial Waste Heat Recovery," Energies, MDPI, vol. 12(20), pages 1-27, October.
    7. Corgnale, Claudio & Hardy, Bruce & Motyka, Theodore & Zidan, Ragaiy & Teprovich, Joseph & Peters, Brent, 2014. "Screening analysis of metal hydride based thermal energy storage systems for concentrating solar power plants," Renewable and Sustainable Energy Reviews, Elsevier, vol. 38(C), pages 821-833.
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    Cited by:

    1. Ziwei Chen & Beini He & Xidong Wang, 2023. "Advanced Utilization Technologies of Secondary Energy and Resources from Energy-Intensive Industries," Energies, MDPI, vol. 16(7), pages 1-3, March.
    2. Serge Nyallang Nyamsi & Ivan Tolj & Michał Jan Gęca, 2022. "Dehydrogenation of Metal Hydride Reactor-Phase Change Materials Coupled with Light-Duty Fuel Cell Vehicles," Energies, MDPI, vol. 15(9), pages 1-18, April.

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