Thermo-economic assessment of metallic high-temperature latent heat storage system

The promising prospects of high-temperature latent heat storage (HT-LHS) systems are accentuated by their advantages, including significant energy storage density, superior energetic efficiency, quasi-isothermal functionality, and seamless integration with renewable energy systems such as 3 rd Gen Concentrated Solar Plant and Thermophotovoltaic systems. This study evaluates the thermo-economic performance of a proposed HT-LHS system having silicon as phase change material (PCM). A single thermal cell and a complete LHS system (consisting of several thermal cells) integrated with the supercritical CO 2 cycle are considered for the thermal and economic analyses, respectively. Furthermore, the charging performance of an equivalent thermal cell is compared with a specific Li-ion cell. Notably, a single thermal cell’s gravimetric and volumetric energy densities surpass those of the specific Li-ion cell by approximately fourfold. Moreover, the charging time of the equivalent thermal cell, with minimal heat flow, is notably shorter than that of the Li-ion cell with comparable capacity. In terms of the levelized cost of electricity (LCoE), the HT-LHS technology demonstrates a significantly lower price of 9.547 Rs/kWh when storing 200 MWh of energy. Sensitivity analysis of LCoE reveals the opposite effect of loan repayment years (LOY) compared to other economic parameters. LCoE varies by 23.1%,16.43%,14.4%, and 8.06% by changing Return on equity (ROE), interest rate on the loan (IOL), Operation and maintenance cost, and discount rate from −40% to 40%.