Thermodynamic modeling and performance analysis for micro adiabatic compressed air energy storage system
The arrangement of micro adiabatic compressed air energy storage(A-CAES)system is flexible and suitable for typical distributed energy systems.By accurately modelling a typical device of the miniature A-CAES system based on pneumatic motors,a thermodynamic model that can reflect its system performance is constructed.The experimental bench of the A-CAES system is built,and the average error rate between the simulation model and the experiment is around 5.38%,which verifies the reliability of the model.The round-trip efficiency and comprehensive efficiency of the system are 4.81%and 27.23%,respectively,verifying the necessity of the existence of thermal energy storage devices in the A-CAES system.The effects of compression level and compression ratio on the system performance are analyzed by using this model.The results show that,as the compression level increases,the round-trip efficiency and comprehensive efficiency of the system both increase,and the optimal efficiency of the system can reach 6.10%and 35.81%,respectively.Taking the combination of compression ratios of 2,3,and 5 as an example,reasonable distribution of compression ratios can improve the round-trip efficiency and overall efficiency of the system by 1.27%and 4.38%,respectively.
microadiabatic compressed air energy storagethermodynamic modelingefficiency