The efficiency of the liquefied carbon dioxide energy storage system is directly affected by the performance of the cold storage packed bed. To investigate the dynamic characteristics of the cold storage packed bed during operation
a model validation was firstly conducted through comparison with experimental data. Subsequently
finite element simulations were utilized to examine the impact of operating conditions on the local thermal non-equilibrium model of the cold storage packed bed. Results indicate that total efficiency can be improved by selecting an appropriate cold storage termination temperature. In both of initial and routine cycles
the utilization rates for cold storage and cold release decrease as the cold storage termination temperature increases
with the maximum overall efficiencies reaching 74.17% and 90.96% in the two operational scenarios
respectively. However
the trends in total efficiencies and utilization rates of cold storage and cold release in relation to the cold storage termination temperature are inconsistent. Therefore
when choosing a higher cold storage termination temperature to enhance the overall efficiency
the corresponding influence of decline in utilization rates for cold storage and cold release should be taken into account.
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references
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