Preliminary prospects of a Carnot-battery based on a supercritical CO2 Brayton cycle

As a part of the change towards higher usage renewable energy sources, which naturally deliver intermittently, need for storage systems is increasing. For compensation disturbance in power production due to inter-day seasonal weather changes, long-term required. In spectrum systems, one out few geographically independent possibilities use heat store electricity, so-called Carnot-batteries. This paper presents Pumped Thermal Energy Storage (PTES) system based on recuperated and recompressed supercritical CO2 Brayton cycle. It analysed if this configuration cycle, most advantageous cycles, can be favourably integrated into Carnot-battery similar high efficiency achieved, despite constraints caused by integration. The modelled PTES operates at pressure ratio 3 with low nominal 8 MPa, temperature range between 16 °C 513 °C. provides round-trip 38.9 % was designed maximum 3.5 MW electric output. research shows that an acceptable achieved Cycle employing as working fluid. However, would expected justify complexity configuration.