A partially underground rock bed thermal energy storage with a novel air flow configuration

Knobloch, Kai; Muhammad, Yousif; Costa, Marta Soler; Moscoso, Fabrizio Mayta; Bahl, Christian; Alm, Ole; Engelbrecht, Kurt

doi:10.1016/j.apenergy.2022.118931

Cited by 29 publications

(9 citation statements)

References 28 publications

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“…The results of the measurement of mechanical strain at the concrete outer shell [52] showed highest strains at the storage top but are below the recommended limits for reinforced concrete. This is also observed from the lack of any cracks in the concrete housing.…”

Section: System-level Changesmentioning

confidence: 57%

“…The combination of a conical frustum and hemispherical shaped housing gives a droplet-like shape. The system has been intensively tested in single as well as consecutive cycles [52]. Being classified as an unpressurized gas/solid packed-bed storage, the system uses atmospheric air as the HTF and rocks as the storage medium.…”

Section: Design Conceptmentioning

confidence: 99%

“…When consecutive cycles were measured, cycles included a dwell time of 10 min at the highest temperature. Please note that no thermal conductivity measurements (literature values for diabase between 0 and 1000 °C range from 1 to 2.5 W m −1 K −1 [53]) were performed since a good stratification inside the packed bed [52] and no indication for a degradation over the investigated operation time were observable.…”

Section: Characterization Techniquesmentioning

confidence: 99%

“…Fig.2. Air flow schematic of the rock TES system[52]. The storage is depicted with a cut view from above.…”

mentioning

confidence: 99%

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Degradation of a rock bed thermal energy storage system

Knobloch

Ulrich²,

Bahl³

et al. 2022

Applied Thermal Engineering

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Section: System-level Changesmentioning

confidence: 57%

Section: Design Conceptmentioning

confidence: 99%

Section: Characterization Techniquesmentioning

confidence: 99%

“…Fig.2. Air flow schematic of the rock TES system[52]. The storage is depicted with a cut view from above.…”

mentioning

confidence: 99%

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Degradation of a rock bed thermal energy storage system

Knobloch

Ulrich²,

Bahl³

et al. 2022

Applied Thermal Engineering

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“…Numerous studies on RTES have been conducted and reported, experimentally [17][18][19] and numerically. 11,[20][21][22] Despite extensive studies that have been reported, further research and development is necessary to ensure the maturity and wide adoption of this technology.…”

Section: Introductionmentioning

confidence: 99%

Progress on rock thermal energy storage (RTES): A state of the art review

Amiri

Ermagan

Kurnia

et al. 2023

Energy Science & Engineering

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Thermal energy is one of the most widely encountered energy forms in our daily life. To ensure efficient utilization and conversion of this energy, the balance between supply and demand needs to be maintained. For this purpose, thermal energy storage is required. There are various thermal energy storage systems available; one of the most basic is sensible thermal energy storage which includes rock thermal energy storage (RTES). This rock‐based energy storage has recently gained significant attention due to its capability to hold large amounts of thermal energy, relatively simple storage mechanism and low cost of storage medium. Accordingly, numerous studies have been conducted to elucidate the basic flow and heat transfer mechanism and to evaluate the performance of this energy storage. The major technical challenges hindering the wide adoption of this technology are the enormous pressure drop across the storage and nonoptimal heat transfer from the heat transfer fluid to the storage medium and vice versa. These issues will directly and indirectly affect the overall cost (capital, operational, and maintenance costs) of the system. To eliminate this issue and assist further development of this technology, it is crucial to compile and extract important findings from these previous studies, identify the challenge and research gap, and draw guidelines for the upcoming research and development. At the moment, this kind of compilation does not exist. Hence, this paper is prepared with the primary objective to comprehensively review the current technology and development of RTES and to propose a potential way forward based on the pain point identified. Discussion on the nontechnical aspect such as policy and regulations as well as community awareness will also be outlined and discussed.

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