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Thermodynamic analysis of a novel energy storage system based on compressed CO 2 fluid
Author(s) -
Zhang XinRong,
Wang GuanBang
Publication year - 2017
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.3732
Subject(s) - compressed air energy storage , energy storage , brayton cycle , exergy , process engineering , renewable energy , supercritical fluid , thermal energy storage , computer data storage , exergy efficiency , engineering , environmental science , mechanical engineering , power (physics) , thermodynamics , computer science , electrical engineering , heat exchanger , physics , operating system
Summary Because of rapidly growing renewable power capacity, energy storage system is in urgent need to cope with the reliability and stability challenges. CO 2 has already been selected as the working fluid, including thermo‐electrical energy storage or electrothermal energy storage systems and compressed CO 2 energy storage (CCES) systems. In this paper, a CCES system based on Brayton cycle with hot water as the heat storage medium is proposed and analyzed. Thermodynamic model of the system is established for energy and exergy analysis. Sensitivity analysis is then conducted to reveal effects of different parameters on system performances and pursue optimization potential. At a typical transcritical operation condition, round trip efficiency is 60% with energy density of 2.6 kWh/m 3 . And for the typical supercritical operation condition, the round trip efficiency can reach 71% with energy density of 23 kWh/m 3 . High round trip efficiency and energy density, which is comparable with those of compressed air energy storage systems, thermo‐electrical energy storage (electrothermal energy storage) systems, and other CCES systems, lead to promising prospect of the proposed system. Copyright © 2017 John Wiley & Sons, Ltd.