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Article

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

1
South African Institute for Advanced Materials Chemistry, University of the Western Cape, Private Bag X17, Bellville 7535, South Africa
2
Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, University of Split, R Boskovica 32, 21000 Split, Croatia
*
Author to whom correspondence should be addressed.
Academic Editor: Adrian Ilinca
Energies 2021, 14(11), 3006; https://doi.org/10.3390/en14113006
Received: 2 April 2021 / Revised: 12 May 2021 / Accepted: 19 May 2021 / Published: 22 May 2021
(This article belongs to the Section B4: Hydrogen Energy)
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. View Full-Text
Keywords: heat storage; metal hydride; active and passive heat management; energy storage efficiency; energy storage density heat storage; metal hydride; active and passive heat management; energy storage efficiency; energy storage density
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MDPI and ACS Style

Nyamsi, S.N.; Tolj, I. The Impact of Active and Passive Thermal Management on the Energy Storage Efficiency of Metal Hydride Pairs Based Heat Storage. Energies 2021, 14, 3006. https://doi.org/10.3390/en14113006

AMA Style

Nyamsi SN, Tolj I. The Impact of Active and Passive Thermal Management on the Energy Storage Efficiency of Metal Hydride Pairs Based Heat Storage. Energies. 2021; 14(11):3006. https://doi.org/10.3390/en14113006

Chicago/Turabian Style

Nyamsi, Serge N., and Ivan Tolj. 2021. "The Impact of Active and Passive Thermal Management on the Energy Storage Efficiency of Metal Hydride Pairs Based Heat Storage" Energies 14, no. 11: 3006. https://doi.org/10.3390/en14113006

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