Hybrid modeling and efficiency analysis of the scroll compressor used in micro compressed air energy storage system

Abstract

A simple, yet accurate hybrid model of scroll compressor (SC) used in micro-compressed air energy storage system (MCAES) is put forward in this paper. The modeling process starts with basic thermodynamic and fundamental physical principles but captures only few key operational characteristic parameters to predict the exhaust temperature, exhaust flow rate and the input torque of the SC, and then the appropriate input and output variables are selected according to the control demands of the system. Compared to the existing models, the hybrid model is more streamlined, and is better to meet the control requirements of the system, considering both accuracy and practicability. The developed model is identified and corrected based on both the experimental data and manual. The testing results show that the maximum error between the predicted results and the experimental data is less than 10%, indicating that the model can predict the system performance accurately. Finally, further efficiency analysis is advanced based on the proposed hybrid model, and the optimal operation range of the compression process is suggested. The hybrid model proposed in this paper lays the foundation for the subsequent capacity design, performance analysis and optimization control of MCAES.