Dynamic analysis of the performance of filled-bed cooling storage in transcritical carbon dioxide energy storage systems
In order to further improve the performance of the carbon dioxide energy storage system,the heat transfer model of carbon dioxide and filled bed at different heat transfer stages was established,and the influence law of key design parameters such as the length of the filled bed on the cold storage unit was explored.The results show that,due to the existence of the thermocline region,a large amount of cold stored in the cold storage material in the initial cycle is not utilized,resulting in a low exergy efficiency.As the number of cycles increases,the thermocline region moves backward,and the exergy efficiency of the cold storage unit increases.After 15 cycles,the cold recovery efficiency and the exergy efficiency of the refrigeration unit are stabilized at 96.10%and 82.44%.Compared with the length of the filled bed,the diameter of the filled bed has a greater influence on its temperature distribution.This study can provide theoretical guidance for the engineering application of filled beds in transcritical CO2 energy storage systems.
compressed carbon dioxide energy storagepacked bedsexergy analysiscold storage performance
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