In this work, a Carnot Battery energy storage system based on organic flash cycle is constructed. And the thermodynamic performance of the system with two working fluids (i-Pentane and cyclopentane) is investigated. The results showed that with the increase of flash evaporation temperature, the system round-trip efficiency, thermodynamic efficiency and energy storage density exhibited a trend of first increasing and then decreasing. The performance of system with i-Pentane is better than that of system with cyclopentane. Meanwhile, the proportion of saturated steam decreases. The performance of system is affected significantly when the isentropic efficiency of the compressor and turbine increases.
Keywords Carnot battery, flash cycle, round-trip efficiency, thermodynamic performance