Abstract
As a promising energy storage technology, liquid carbon dioxide energy storage has become a hotspot due to its high energy density and less restriction by the geographical conditions. A new liquid carbon dioxide energy storage system with cold recuperator and low pressure stores is presented in this paper. Mathematical model of the system is established and parametric analysis is conducted to investigate the influences of some crucial variables on the system performance. Moreover, advanced exergy analysis is utilized to reveal the interactions among components and the system’s real improvement potential. Results demonstrate that the system embraces a 7.3% improvement of round trip efficiency compared to the system without cold recuperator. More importantly, the total volume of tanks is reduced by 32.65%. Advanced exergy analysis indicates that the interconnections between system components are not very strong. Both conventional and advanced exergy analysis suggest that the low pressure compressor should be given the first priority for optimization. The difference is that the high pressure compressor and latent cold storage is in the third and fourth place for the conventional method while it is located in the second and fifth priority in the advanced method.
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