Number of compressed air energy storage system and optimal configuration of heat exchanger

The theory of energy storage, heat storage, and energy release is established by applying the thermodynamics theory on the basis of the working principle of the compressed air storage system for heat storage, and the correctness of the basic model is verified via experiments. The relationship between the numbers of compression and expansion stages and the influence law between the number of stages and the efficiency of the heat exchanger are analyzed. The results show that the optimum matching heat exchanger efficiency is between 0.90-0.85 and 68%-71.8% when the compression/expansion level is 2, 3, and 4. When the compression/expansion series is 5, 6, and 7, the matching heat exchanger performance is between 0.85-0.75, and its efficiency can reach 68.1%-68.9%. When the compression/expansion series is 8 and 9, the matching heat exchanger performance is between 0.8 and 0.75, and its efficiency can reach 68% to 68.2%. Moreover, the optimal match between the number of stages and the efficiency of the heat exchanger is obtained. Analytical models and research results provide a basis for designing efficient forms of compressed air storage systems.