Thermodynamic analysis of a copper-based chemical looping combustion system with integrated energy storage for combined cooling, heating, and power

Abstract

In this study, a novel combined cooling, heating, and power (CCHP) system integrating a copper-based chemical looping combustion-driven Brayton cycle, a liquid natural gas (LNG) regasification unit, and a compressed carbon dioxide energy storage (CCES) is introduced. Through the development of a thermodynamic model, the system's performance benefits and exergy flow distribution are explained, followed by a detailed parametric analysis. The results indicate that the proposed system's round-trip efficiency, energy storage density, and discharge time surpass those of the standalone CCES unit by factors of 1.59, 17.63, and 3.25, respectively. The system achieves a thermal efficiency of 72.34 % and an exergy efficiency of 40.54 %, accompanied by concurrent changes in the cooling and heating power with the electrical output. Exergy analysis identifies the reactors as the primary contributor to exergy loss, followed by the heat exchanger1 during charge and the condenser during discharge. The parameter analysis reveals that all the considered parameters during discharge rationally regulate the heating and cooling power while modulating the electric power, whereas the compressor inlet parameters during charge can realize a reasonable power regulation only in a collaborative way. Meanwhile, each collaborative parameter demonstrates a maximum threshold value, characterized by a well-fitted dimensionless equation.