首页|Performance analysis of a novel isothermal compressed carbon dioxide energy storage system
Performance analysis of a novel isothermal compressed carbon dioxide energy storage system
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NETL
NSTL
Elsevier
Isothermal compressed gas energy storage (I-CGES) systems are widely recognized for their simplicity and high cycle efficiency. However, challenges such as limited energy storage density and suboptimal thermodynamic performance remain. In this study, an innovative isothermal compressed carbon dioxide energy storage (I-CCES) system is proposed, which utilizes a dual-liquid piston structure and uses carbon dioxide as the working medium, taking full advantage of the superior thermal conductivity of carbon dioxide. A comprehensive model is developed to evaluate the system performance, and the main indexes include energy storage density, round-trip efficiency and compression/expansion efficiency. The effects of ambient temperature, pressure parameters and flow rate were systematically analyzed. The results show that the system has an energy storage density of 0.404 kWh/m3, round-trip efficiency of 58.24 % and an indicated efficiency of 74.48 % under the design parameters. By optimizing the ambient temperature (296.15-300.15 K), minimum pressure (2.0-3.0 MPa) and maximum pressure (5.0-6.0 MPa), the round-trip efficiency and energy storage density can be increased to 64.54 % and 0.409 kWh/m3, respectively. It is noteworthy that the flow rate variation has a negligible effect on the efficiency, which emphasizes the robustness of the system under dynamic operating conditions.
Energy storageIsothermal compressionCarbon dioxideLiquid pistonSystem performanceAIR
NETL
NSTL
Elsevier
