Comprehensive analytical model of energy and exergy performance of the thermal energy storage

Determining the performance of heat storage units is essential to reliably determine the capability of entire energy storage systems, as several energy loss and dissipation phenomena can significantly degrade its final efficiency. Previous scientific works has not focused on the detailed treatment o...

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Bibliographic Details
Published in:Energy (Oxford) 2023-11, Vol.283, p.128783, Article 128783
Main Authors: Ochmann, J., Rusin, K., Bartela, Ł.
Format: Article
Language:English
Subjects:
Adiabatic compressed air energy storage
Analytical mode
Heat transfer in packed bed
Thermal energy storage
Variable operating parameters
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Summary:Determining the performance of heat storage units is essential to reliably determine the capability of entire energy storage systems, as several energy loss and dissipation phenomena can significantly degrade its final efficiency. Previous scientific works has not focused on the detailed treatment of the heat storage tank and its impact on the functioning of other system components. The work emphasizes the presentation of a in-house numerical model of Thermal Energy Storage filled with rock material. The comprehensive numerical model has been presented that also takes into account the variable operating parameters of the compressor and air expander. The multivariate nature of the model used makes it possible to estimate the influence of individual factors on the final efficiency of the system. The calculations made it possible to determine the potential of a system with a capacity of 175 MWh using post-mining shafts. The long-term energy efficiency of the system was 57.47%, with a heat storage energy efficiency of 91.96% and an exergy efficiency of 82.93%. Implementation of the model has the potential to provide more accurate estimations of the potential of proposed energy systems using heat storage. •The article presents the author's novel TES tank calculation algorithm.•Different correlations per Nusselt number were used depending on the operation stage.•The long-term performance of the TES tank has been investigated.•After 30 cycles, the energy efficiency was 91.96% and the exergy efficiency was 82.93%.•Heat accumulation in the wall and insulation of the tank was taken into account.
ISSN:0360-5442
DOI:10.1016/j.energy.2023.128783