Analysis of the thermal ratcheting phenomenon in packed-bed thermal energy storage using Discrete Element Method

Mitterlehner, Thomas; Kartnig, Georg; Haider, Markus

doi:10.5937/fme2002427m

Cited by 15 publications

(3 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The observation of surface dust can also be related to the expansion, additionally to the suspicion that it is a consequence of the oxidation processes. An experimental characterization of such surface dust, localization of debris from degraded rocks (either by inspecting the rock bed bottom or by filtering the outlet air) as well as detailed models using the Discrete Element Method (DEM) [54] or measurement of rock acoustics [50] can help to further assess the challenges related to thermal ratcheting in rock beds. However, the diabase seems well suited to high-temperature TES since its small grain sizes allow heating to a higher temperature before the rock undergoes permanent strain and fracture, in line with literature reporting the unsuitability of coarse-grained rocks [46].…”

Section: Discussionmentioning

confidence: 99%

Degradation of a rock bed thermal energy storage system

Knobloch

Ulrich²,

Bahl³

et al. 2022

Applied Thermal Engineering

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 99%

Degradation of a rock bed thermal energy storage system

Knobloch

Ulrich²,

Bahl³

et al. 2022

Applied Thermal Engineering

View full text Add to dashboard Cite

“…The thermal and stress responses during the standard operational cycles of a packedbed TES system, as well as methods for their analysis, represent current issues of interest. These topics have primarily been addressed through the development of theoretical models, based on Discrete Element Methodology (DEM) [25,27], with limited experimental investigations conducted thus far. To the best of our knowledge, concerning packed bed thermal storage, there is only one experimental study presented by Dreiβigacker et al over a 0.9 m 3 tank filled with ceramic spherical particles [28].…”

Section: Introductionmentioning

confidence: 99%

Characterization of the Ratcheting Effect on the Filler Material of a Steel Slag-Based Thermal Energy Storage

Garitaonandia,

Arribalzaga,

Miguel

et al. 2024

Energies

View full text Add to dashboard Cite

Thermocline thermal energy storage systems play a crucial role in enhancing energy efficiency in energy-intensive industries. Among available technologies, air-based packed bed systems are promising due to their ability to utilize cost-effective materials. Recently, one of the most intriguing filler materials under study is steel slag, a byproduct of the steel industry. Steel slag offers affordability, ample availability without conflicting usage, stability at temperatures up to 1000 °C, compatibility with heat transfer fluids, and non-toxicity. Previous research demonstrated favorable thermophysical and mechanical properties. Nonetheless, a frequently overlooked aspect is the endurance of the slag particles, when exposed to both mechanical and thermal stresses across numerous charging and discharging cycles. Throughout the thermal cyclic process, the slag within the tank experiences substantial loads at elevated temperatures, undergoing thermal expansion and contraction. This phenomenon can result in the deterioration of individual particles and potential damage to the tank structure. However, assessing the extended performance of these systems is challenging due to the considerable time required for thermal cycles at a relevant scale. To address this issue, this paper introduces a specially designed fast testing apparatus, providing the corresponding testing results of a real-scale system over 15 years of operation.

show abstract

“…In recent years, thermally induced deformations of sands have been reported to play a central role in the failure of silos 21,22 , to represent a threat for thermal energy storage tanks 1,2,23,[6][7][8]24 , to induce unwanted settlement of geothermal technologies [25][26][27][28][29] , and to trigger continuous changes in the morphology of landforms 30 . However, despite the ubiquity of sands and the foregoing observations, the mechanics of sands subjected to thermal cycling presently remains poorly characterized and understood.…”

Section: Introductionmentioning

confidence: 99%

Thermal ratcheting in granular materials with irregular particle shapes

Pan¹,

Gong²,

Loria³

2023

Preprint

View full text Add to dashboard Cite

Granular materials with irregular particle shapes, such as sands, undergo a myriad of temperature variations in natural and engineered systems. However, the impacts of cyclic temperature variations on the mechanics of granular materials remain poorly understood. In this context, little is known about the mechanical response of such materials to cyclic temperature variations for central variables that characterize granular systems: particle shapes, applied stress levels, relative densities, and temperature amplitudes. This paper presents advanced laboratory experiments to explore the impacts of cyclic temperature variations on the mechanics of sands. The results show that cyclic temperature variations applied to sands induce thermal ratcheting: the cumulative growth of irreversible bulk deformations of such materials due to microstructural rearrangements caused by thermal expansions and contractions of constituting particles. The deformations of granular materials caused by thermal ratcheting strongly depend on particle shape, stress level, relative density, and temperature amplitude. These deformations are limited for individual thermal cycles but accumulate and become significant for multiple thermal cycles. Thermal ratcheting leads to substantial compaction in sands and other granular materials, which can affect various natural and engineered systems.

show abstract

Analysis of the thermal ratcheting phenomenon in packed-bed thermal energy storage using Discrete Element Method

Cited by 15 publications

References 6 publications

Degradation of a rock bed thermal energy storage system

Degradation of a rock bed thermal energy storage system

Characterization of the Ratcheting Effect on the Filler Material of a Steel Slag-Based Thermal Energy Storage

Thermal ratcheting in granular materials with irregular particle shapes

Contact Info

Product

Resources

About