The Performance of Micro Adiabatic Compressed Air Energy Storage System with Different Final Pressure of Air Storage Tank

Abstract Micro adiabatic compressed air energy storage (A‐CAES) systems have emerged as a research hotspot due to their flexible compatibility with distributed energy systems. This study establishes a thermodynamic model of a micro A‐CAES system based on a pneumatic motor (PM). The research systematically examines the influence of final gas tank pressure (Pf) within the range of 1.5–3.0 MPa on system performance, with particular focus on monitoring the response characteristics of pneumatic motor inlet pressure, air mass flow rate, and power output. Meanwhile, the expansion stage is divided into a stable operation stage and an unstable operation stage. The research results show that the final pressure of the gas storage tank affects the stable operation stage of the pneumatic motor, but has no obvious impact on the unstable operation stage. The round‐trip efficiency of the system reaches the highest value of 5.4% when Pf = 2.5 MPa; the comprehensive efficiency reaches the highest value of 26.6% when Pf = 2 MPa; and the efficiency improvement index reaches the highest value of 21.5% when Pf = 1.5 MPa. Through the economic analysis, it is found that the economic performance of this system is optimal when Pf = 2 MPa.