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Optimal Design of Combined Two-Tank Latent and Metal Hydrides-Based Thermochemical Heat Storage Systems for High-Temperature Waste Heat Recovery

Author

Listed:
  • Serge Nyallang Nyamsi

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

  • Mykhaylo Lototskyy

    (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, Rudjera Boskovica 32, 21000 Split, Croatia)

Abstract

The integration of thermal energy storage systems (TES) in waste-heat recovery applications shows great potential for energy efficiency improvement. In this study, a 2D mathematical model is formulated to analyze the performance of a two-tank thermochemical heat storage system using metal hydrides pair (Mg 2 Ni/LaNi 5 ), for high-temperature waste heat recovery. Moreover, the system integrates a phase change material (PCM) to store and restore the heat of reaction of LaNi 5 . The effects of key properties of the PCM on the dynamics of the heat storage system were analyzed. Then, the TES was optimized using a genetic algorithm-based multi-objective optimization tool (NSGA-II), to maximize the power density, the energy density and storage efficiency simultaneously. The results indicate that the melting point T m and the effective thermal conductivity of the PCM greatly affect the energy storage density and power output. For the range of melting point T m = 30–50 °C used in this study, it was shown that a PCM with T m = 47–49 °C leads to a maximum heat storage performance. Indeed, at that melting point narrow range, the thermodynamic driving force of reaction between metal hydrides during the heat charging and discharging processes is almost equal. The increase in the effective thermal conductivity by the addition of graphite brings about a tradeoff between increasing power output and decreasing the energy storage density. Finally, the hysteresis behavior (the difference between the melting and freezing point) only negatively impacts energy storage and power density during the heat discharging process by up to 9%. This study paves the way for the selection of PCMs for such combined thermochemical-latent heat storage systems.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:16:p:4216-:d:399168
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    References listed on IDEAS

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    Cited by:

    1. 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.
    2. 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.
    3. 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.
    4. Katarina Tomičić-Pupek & Ilija Srpak & Ladislav Havaš & Dunja Srpak, 2020. "Algorithm for Customizing the Material Selection Process for Application in Power Engineering," Energies, MDPI, vol. 13(23), pages 1-14, December.

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