Thermodynamic analysis of a novel pumped thermal energy storage system with waste heat integration

Pumped thermal energy storage (PTES) system is a large-scale electricity storage technique, and the thermally integrated PTES system has been brought forward to raise the energy storage efficiency and extend feasible ways to utilize the low-grade waste heat (<100 °C). The solutions to raise the power-topower efficiency of the thermally integrated PTES system have aroused much attention worldwide. This paper presents an