Experimental investigation of the thermal and mechanical stability of rocks for high-temperature thermal-energy storage
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Date
2017-10-01Type
- Journal Article
Citations
Cited 74 times in
Web of Science
Cited 77 times in
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ETH Bibliography
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Abstract
Six types of rocks of Alpine origin were investigated for their suitability for high-temperature packed-bed thermal-energy storage. The rocks were thermally cycled in laboratory furnaces between about 100 °C and 600°C with a heating rate of 2.6°C/min and assessed in terms of their specific heat capacity and porosity as well as the degree of cracking, fracturing, and disintegration. Thermal cycling was found to lead to decreases in the specific heat capacity and increases in the porosity of the rocks. These changes are explained by physical and chemical reactions such as mineral dehydration, deserpentinization, decarbonation, and the quartz-inversion reaction. Simulations of a 23MWh industrial-scale thermal-energy storage show that the decrease in the specific heat capacity does not have a significant impact on the effective storage capacity, utilization factor, and exergy efficiency. To avoid fracturing of rocks, foliated rocks and rocks rich in calcite and/or quartz, such as limestones and sandstones, are found to be unsuitable when exposed to temperatures higher than about 600°C or 573°C, respectively. Mafic rocks, felsic rocks, serpentinite, and quartz-rich conglomerates are judged to be suitable for high-temperature thermal-energy storage. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000164962Publication status
publishedExternal links
Journal / series
Applied EnergyVolume
Pages / Article No.
Publisher
ElsevierSubject
Thermal-energy storage; High temperature; Packed beds; Rocks; Specific heat capacity; PorosityOrganisational unit
03530 - Steinfeld, Aldo / Steinfeld, Aldo
03392 - Burg, Jean-Pierre (emeritus)
03484 - Mazzotti, Marco / Mazzotti, Marco
02818 - Schweiz. Erdbebendienst (SED) / Swiss Seismological Service (SED)
Funding
153776 - Design and Optimization of High-Temperature Combined Sensible/Latent-Heat Storage (SNF)
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Show all metadata
Citations
Cited 74 times in
Web of Science
Cited 77 times in
Scopus
ETH Bibliography
yes
Altmetrics