University of Economic Sciences, Campus, architect Zaha Hadid, Vienna, Austria, Europe
Researchers at the Vienna University of Technology are developing thermochemical storage systems capable of storing energy for months, years, or even decades with minimal loss. The systems, created under the EU project RESTORE, can store energy in both thermal and electrical forms and retrieve it in either form, offering a crucial solution for balancing seasonal energy supply and demand.
By using a mixture of oil and salt hydrate, the storage process involves separating water during charging and reintroducing it during discharge, achieving a high energy density of around 1.1 GJ/m³—much greater than conventional hot water systems. Prototypes ranging from one to 30 kilowatts have been developed and tested, with simulations exploring scalability to systems of up to one megawatt.
The technology is particularly promising for capturing waste heat from industrial processes or enhancing energy output from solar and geothermal plants. The ultimate goal is to integrate these storage systems into practical applications, ensuring efficient use of renewable energy year-round.
Source: Vienna University of Technology
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