Compact Thermal Energy Storage: Technology Position Paper

English summary

Date of publication: June 2023.

Half of the world’s final energy demand is used for heating and cooling purposes. To match the variability of renewable sources and optimize the performance of thermal systems, thermal energy storage systems are needed. Compact thermal energy storage (CTES) technologies enable the storage of heat in a more compact manner compared to water or other sensible storage technologies. Main application fields of CTES are sector coupling, energy efficiency for heating and cooling in buildings, heat recovery in industrial processes, cold storage for data centers, drying processes and seasonal thermal storage of solar energy.

A short overview is given of the development status of CTES technologies, followed by a market potential estimate for the application fields seasonal storage of solar energy (375 TWh), zeolite dishwasher (4.7 TWh), distributed power-to-heat (300 TWh), data center cooling (10 GW of demand response power in Europe), thermal comfort in buildings (not yet quantified) and industrial processes (at least 1600 TWh).

Finally, a listing of potential drivers for a successful implementation of CTES is given:

Main Activities

• The need for distributed thermal storage enables better utilization of excess renewable energy and accelerates the replacement of fossil fuels by renewables, with no additional grid infrastructure needed

• Higher volatility of arbitrage prices will translate the thermal storage added value to an energy system into monetary value

• The need for a diversification of energy supply and, therefore, an increased security of supply

• Lowering the material and component costs

These potentials are coupled to several actions that can be taken by engineers, policy makers, electricity companies, industry decision makers and professional organisations.

Link: Compact Thermal Energy Storage: Technology Position Paper

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