Study on the influence of expansion section parameters on the performance of compressed air energy storage system

Abstract

Compressed air energy storage (CAES) gains attention because of its promising future application. In this paper, the parameters related to the expansion section, such as the heat exchanger efficiency, the high-pressure storage tank outlet air temperature and the high-pressure storage tank outlet air pressure, are selected to study their effects on the performance and setting of the CAES system. The results show that with the change in heat exchanger efficiency, air temperature and pressure at the tank outlet, the compression and expansion stage numbers are significantly affected. Because of the influence of the change of compression and expansion stage numbers, the hot water residual temperature, the efficiency of the first cycle, the efficiency after multiple cycles, and the area of the heat exchanger have changed. It can be seen that the change of expansion section parameters mainly affects the system performance by affecting the setting of compressor and expander stages.