Investigation of the long-term stability of quartzite and basalt for a potential use as filler materials for a molten-salt based thermocline storage concept

Martin, Claudia; Bonk, Alexander; Braun, Markus; Odenthal, Christian; Bauer, Thomas

doi:10.1016/j.solener.2018.06.090

Cited by 25 publications

(13 citation statements)

References 35 publications

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“…In the meantime, filling the storage tank with solid materials is now commonly considered in studies for CSP plants since it makes possible to the cost reduction of the TES system [Martin et al, 2018]. The optimization of thermocline behaviors at the presence of solid fillers by considering both the thermal diffusion the fluid-solid interactions is also the topic of our current work.…”

Section: Discussionmentioning

confidence: 99%

Single-tank thermal energy storage systems for concentrated solar power: Flow distribution optimization for thermocline evolution management

Lou

Fan

Luo

2020

Journal of Energy Storage

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Concentrated Solar Power (CSP) technology captures solar radiation and converts it into heat for electricity production. It has received an increasing attention because integrated thermal energy storage (TES) systems can largely enhancing the reliability and the dispatchability. Over the last decade, low-cost single storage tank based on the thermocline technology becomes an alternative to commonly-used two-tank TES system. However, the improper inlet/outlet manifolds may cause the strong mixing of hot and cold fluids and disturb the temperature stratification, resulting in reduced thermal performances of the storage tank. This study aims at solving the flow maldistribution problem in the single-tank thermocline storage system by appropriately structuring the inlet/outlet manifolds. The technical solution is based on the insertion of optimized perforated baffles in the manifolds. 2D Computational fluid dynamics simulations were performed to calculate the transient flow and temperature profiles in the storage tank during the charging and discharging operations. The optimal size distribution of orifices on the upper baffle has been determined for homogenizing passage times of the thermal front, so as to enhance the temperature stratification. A novel intermediate evaluation indicator was introduced to characterize the real-time thermal behavior, which could reduce the computational cost of the optimization problem by a factor of 6 at least. Numerical results shown that the proposed optimization algorithm could significantly improve the thermal performances, indicated by the increased values of charging/discharging efficiency, the capacity ratio and the overall efficiency, ex., the fully charging efficiency be increased by 29% by comparing the unstructured manifold geometry and the one with optimized baffles. The parametric study on certain geometry and operating factors also demonstrated that the proposed method for flow distribution optimization was robust, effective and efficient.

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Section: Discussionmentioning

confidence: 99%

Single-tank thermal energy storage systems for concentrated solar power: Flow distribution optimization for thermocline evolution management

Lou

Fan

Luo

2020

Journal of Energy Storage

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“…A number of studies mention that mass loss was observed after thermal cycling up to 1000 C under air due to the calcination, decomposition of organics, dehydration, and so on. 2,9,33 In other studies, no mass loss after thermal cycling was observed. 20,35 In the study by Grosu et al, 23 river rock and basic oxygen furnace slag samples showed minor mass loss at 170 C due to the organics decomposition and water removal.…”

Section: Change In Thermophysical and Mechanical Propertiesmentioning

confidence: 80%

“…As discussed above, mass of the samples changed after thermal cycling due to the oil penetration. A number of studies mention that mass loss was observed after thermal cycling up to 1000°C under air due to the calcination, decomposition of organics, dehydration, and so on 2,9,33 . In other studies, no mass loss after thermal cycling was observed 20,35 .…”

Section: Resultsmentioning

confidence: 99%

“…Recent studies focus on using packed-bed TES tank filled with solid packing to provide several benefits such as reducing the usage of mineral oil and molten salts as liquid, overall cost reduction potential, simple design, and environmentally friendliness. 1,2 Solid STESMs such as silica sand, natural rock, glass, steel, alumina, quartzite, and concrete were suggested as alternative low-cost STESMs instead of molten salt and mineral oil for hightemperature applications. [3][4][5] There are several studies in literature showing that such solid STESMs have good storage performance for high-temperature TES applications.…”

Section: Introductionmentioning

confidence: 99%

“…There are several studies on stability of solid STESMs for long‐term applications. Martin et al 2 investigated the long‐term stability of quartzite and basalt up to 560°C to reduce cost of molten‐salt‐based thermocline storage system by replacing a significant amount of solar salt. Quartzite and basalt were thermally stable after thermal treatment in solar salt at 560°C for 1000 hours.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Long‐term stability of sensible thermal energy storage materials developed from demolition wastes interacting with hot heat transfer fluid

Koçak

Fernández

Paksoy

2021

Intl J of Energy Research

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Summary Packed‐bed thermal energy storage (TES) system filled with low cost and sustainable sensible thermal energy storage material (STESM) is a promising option for medium–high temperature applications. STESM developed from demolition wastes are eco‐innovative and compatible with circular economy. They can be used in solar heat industrial applications up to 750°C. One of the main concerns that should be taken into consideration is the stability of STESM developed from demolition wastes in direct contact with hot heat transfer fluids (HTFs). In this study, thermal and mechanical stability of STESM developed from demolition waste were investigated using repeated heating and cooling cycles in Therminol 66 synthetic oil as HTF at 150°C for up to 500 hours. The characterization results before and after thermal cycling showed that new STESM developed from demolition wastes is thermally and mechanically stable. Also, strong oil penetration into the STESM samples improved the porosity, strength, and specific heat capacity. The specific heat capacity and mechanical strength values increased from 1330 to 1490 J/kgC and from 4 to 6 MPa, respectively. These results suggest that STESM samples developed from demolition waste can be used reliably in solar heat industrial applications for long term.

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Fundamentals of high-temperature thermal energy storage, transfer, and conversion

Bauer

2021

Ultra-High Temperature Thermal Energy Storage, Transfer and Conversion

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Investigation of the long-term stability of quartzite and basalt for a potential use as filler materials for a molten-salt based thermocline storage concept

Cited by 25 publications

References 35 publications

Single-tank thermal energy storage systems for concentrated solar power: Flow distribution optimization for thermocline evolution management

Single-tank thermal energy storage systems for concentrated solar power: Flow distribution optimization for thermocline evolution management

Long‐term stability of sensible thermal energy storage materials developed from demolition wastes interacting with hot heat transfer fluid

Fundamentals of high-temperature thermal energy storage, transfer, and conversion

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