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.
|Number of pages||12|
|Publication status||Published - 2018|
|Event||1st Latin American Conference on Sustainable Development of Energy, Water and Environment Systems - Escola de Química, UFRJ, Rio de Janeiro, Brazil|
Duration: 28 Jan 2018 → 31 Jan 2018
Conference number: 1
|Conference||1st Latin American Conference on Sustainable Development of Energy, Water and Environment Systems|
|Location||Escola de Química, UFRJ|
|City||Rio de Janeiro|
|Period||28/01/2018 → 31/01/2018|
- Thermal energy
- Rock bed
- Thermal properties