Volume 60

Therm economic analysis of subcritical compressed carbon dioxide energy storage system Xingpeng Yan, Kaiyue Zheng , Chuangang Bai , Xiaohu Yang , Zhan Liu

Abstract

Compressed carbon dioxide energy storage has received widespread attention as an effective solution to address the intermittency of renewable energy sources. This article proposes a novel compressed carbon dioxide energy storage system with a flexible gas warehouse compartment, which stores carbon dioxide at ambient temperature and pressure. A mathematical model is established and a parameter analysis is conducted to evaluate the thermodynamic and economic performance of the proposed system. The results indicate that increasing the mechanical efficiency of the compressor and expander can achieve lower electricity costs and higher round-trip efficiency. By reducing the pinch temperature of the heat exchanger, higher round-trip efficiency and lower electricity costs can be achieved.

Keywords Compressed carbon dioxide energy storage system, pinch temperature difference, mechanical efficiency