High-Temperature Thermal Energy Storage for electrification and district heating

Research output: Contribution to conferencePaper – Annual report year: 2018Researchpeer-review

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The present work describes development of a High Temperature Thermal Energy Storage (HT-TES) system based on rock bed technology.

A selection of rocks was investigated by thermal analysis in the range 20-800 ˚C. Subsequently, a shortlist was defined primarily based on mechanical and chemical stability upon thermal cycling. The most promising material consists of basalt, diabase, and magnetite, whereas the less suited rocks contain larger proportions of quartz and mica.

An HT-TES system, containing 1.5 m3 of rock pieces, was constructed. The rock bed was heated to 600 ˚C using an electric heater to simulate thermal charging from wind energy. After complete heating of the rock bed it was left fully charged for hours to simulate actual storage conditions. Subsequently the bed discharging was performed by leading cold air through the rock bed whereby the air was heated and led to an exhaust.

The results showed that HT-TES has a role to play in future, sustainable energy systems. A cost benefit analysis based on projected electricity prices for the Scandinavian region in 2035 showed that a business case is achievable.

Original languageEnglish
Publication date2018
Number of pages12
Publication statusPublished - 2018
Event1st Latin American Conference on Sustainable Development of Energy, Water and Environment Systems - Escola de Química, UFRJ, Rio de Janeiro, Brazil
Duration: 28 Jan 201831 Jan 2018
Conference number: 1


Conference1st Latin American Conference on Sustainable Development of Energy, Water and Environment Systems
LocationEscola de Química, UFRJ
CityRio de Janeiro
Internet address

    Research areas

  • Thermal energy, Rock bed, Storage, Minerals, Thermal properties, Economy

ID: 147556281