Energy storage system based on transcritical CO2 cycles and geological storage

Editorial: SDEWES science - The path to a sustainable carbon neutral world

“…This is followed by electrochemical energy systems, batteries, with a discharge capacity limited to about 40 MW [132,133], at a development level ranging from TRL 9 to systems whose prototype or components have been tested in relevant environments (TRL 5). At a lower level of development but with a discharge capacity similar to that of thermal systems [134,135], are thermochemical systems, where the technology components have only been tested at the laboratory level (TRL 3-4). In terms of efficiency, mechanical systems would range from 60-80% [136,137], followed by 50-90% for thermal systems [138].…”

Diffusivity of CO2 in H2O: A Review of Experimental Studies and Molecular Simulations in the Bulk and in Confinement

“…Conventional geothermal systems that use H 2 O for the transmission of heat suffer from the drawback of fluid loss that has a significant negative economic effect. Dense-phase CO 2 has thermal characteristics that allow it to transfer large quantities of heat, while at the same time having better physical characteristics (e.g., lower viscosity, higher compressibility, and expansibility). , Therefore, CO 2 has been considered for utilization in the process of geothermal energy by extracting heat from the ground. − Such a process combines heat recovery from the subsurface, while the working fluid (e.g., CO 2 ) losses can be considered as a part of CCS. In this way, value is added to the heat recovery process instead of considering it a financial loss, as occurs when using H 2 O as the working fluid.…”