Volume 63

Integrated Design and Parameter Analysis of Compressed Air Energy Storage System Ya Hao, Xueling Liu, Jiapeng Wu, Bo Feng

Abstract

In recent years, efficient energy storage technologies have become a key factor restricting energy transition and development. Compressed air energy storage (CAES), due to its high reliability, low cost, and minor environmental impact, has gradually emerged as a promising technology for large-scale, long-duration energy storage. To overcome site limitations and utilize geothermal energy, an integrated system combining compressed air energy storage, geothermal utilization, and an organic Rankine cycle (ORC) was proposed. The power output and heat transfer processes of the integrated system under long-term operation were simulated. Seasonal variations in compressor power consumption, power generation, and round-trip efficiency were calculated, and the enhancement effect of the ORC on system round-trip efficiency was confirmed. Furthermore, the influence mechanisms of mass flow rate and compression pressure on system performance were investigated. The results revealed that both production temperature and power generation exhibited seasonal periodic variations with gradual annual declines, while coupling with the ORC improved the round-trip efficiency of the integrated system. With increasing mass flow rate and compression pressure, the round-trip efficiency was reduced. This study provides theoretical support for the design and optimization of CAES systems utilizing hot dry rock resources and demonstrates significant application potential and research value.

Keywords Compressed air energy storage (CAES), Geothermal utilization, Organic Rankine cycle (ORC) power generation, Integrated system