General Role: Ice slurry development expertise and supervision
Specific technologies in charge of: Ice slurry development using the supercooling method.
Main goal of the project: The low-temperature reservoir (LTR) is a key component of CO2-based Pumped Thermal Energy Storage (PTES) systems. The key metrics for a LTR are the capital cost, operation and maintenance (O&M) cost and tight approach temperature. For the baseline 25 MWe – 100 MWe CO2-based PTES system the target capital cost is less than $240/kWe, O&M cost of less than $0.001/kWhe and approach temperature of less than 3oC.
Extended Summary: The overall goal of the project is to create and validate the design of LTR for 25 – 100 MWe 10-hour CO2-based PTES system operation. Three LTR technologies: (i)Ice-on-Coil (IOC), (ii)Ice-Phobic Heat Exchanger (IHEX) technology (a passive Ice-Slurry Generator (ISG)) and, (iii)Super-cooler Heat Exchanger (SCHE) technology (also a passive Ice-Slurry Generator (ISG)), which are currently widely being considered for PTES applications, will be designed, fabricated, and tested as part of current program at power capacities of 10 kW. Due to sheer scale and cost of building an LTR for commercial-scale PTES system, a scalable laboratory-scale LTR will be built and tested in CO2 environment for performance evaluation. Sufficient instrumentation will be utilized to validate that the subscale LTR meet the expectations developed during the design process.
Figure. Semi-welded supercooler for CO2 applications tested at SPF.
Duration: 2022-2025
Project Partners:
Web: https://www.echogen.com/energy-storage/etes-system-overview/
Funding Agency: U.S Department of Energy (DOE)
