Advanced exergy analysis of a Joule-Brayton pumped thermal electricity storage system with liquid-phase storage

Abstract Pumped thermal electricity storage is a thermo-mechanical energy technology that has emerged as promising option for large-scale (grid) because of its lack geographical restrictions and relatively low capital costs. This paper focuses on 10 MW Joule-Brayton pumped system with liquid stores performs detailed conventional advanced exergy analyses this system. Results the analysis recuperated indicate expander during discharge associated maximum destruction rate (13%). The further reveals that, amongst components studied, cold heat exchanger highest share (95%) avoidable rate, while charge same component (64%) endogenous rate. Thus, offers largest potential improvement in overall exergetic efficiency. A quantitative performance demonstrates increasing isentropic efficiency compressor turbine from 85% to 95% significantly increases modified 37% 57%. Similarly, by effectiveness decreasing pressure loss factor all exchangers, 0.90 0.98 2.5% 0.5% respectively, 34% 54%. results provide novel insight into innovation, research development technology.