A thermocline thermal energy storage system with filler materials for concentrated solar power plants: Experimental data and numerical model sensitivity to different experimental tank scales

Hoffmann, Jean-François; Fasquelle, Thomas; Goetz, V.; Py, Xavier

doi:10.1016/j.applthermaleng.2016.01.110

Cited by 127 publications

(50 citation statements)

References 31 publications

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“…A preliminary validation of the model described in Section has been presented by Niedermeier et al In the absence of currently available experimental data with LMs, published experiments with solar salt and thermal oil, as given in previous studies, have been used. Good agreement with the experimental data has been obtained, with minor differences attributed to uncertainties and challenges in the experiments, as well as simplifications of the mathematical model to reduce computational effort, e.g., constant physical properties.…”

Section: Reference Scenariomentioning

confidence: 99%

Thermodynamic Analysis of High‐Temperature Energy Storage Concepts Based on Liquid Metal Technology

et al. 2019

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Within the thermal energy storage (TES) initiative NAtional Demonstrator for IseNtropic Energy storage (NADINE), three projects have been conducted, each focusing on TES at different temperature levels. Herein, technical concepts for using liquid metal technology in innovative high‐temperature TES systems are dealt with. This approach implies some challenges; first, the unit costs are relatively large which makes a reduction of the mass inventory necessary. Second, the high thermal diffusivity, which is beneficial in any heat exchanger unit, reduces the efficiency in a single‐tank TES due to the fast degradation of the thermocline. These limitations can be overcome using a nonexpensive solid filler material, and, if properly designed, similar performance as in state‐of‐the‐art molten salt systems can be obtained, while maintaining the advantage of operating at temperatures well beyond their upper limit. Optimization strategies are presented for a reference case including transient behavior of the whole system. The sensitivity of multiple parameters, e.g., porosity, particle size, and influence of storage capacity regarding the discharge efficiency, is investigated.

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Section: Reference Scenariomentioning

confidence: 99%

Thermodynamic Analysis of High‐Temperature Energy Storage Concepts Based on Liquid Metal Technology

et al. 2019

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“…The storage model concerns heat exchange between the different components of the storage tank, Thereby, it allows the prediction of the thermocline behavior, and hence the evaluation of the performances for both quartzite and magnetite coupled with different heat transfer fluids commonly used in this field. Dual phase model is adopted [8] [9]. It is based on heat and mass balance and considers that the packed-bed contained in the storage tank as continuous mediums, formed by two distinct systems: the HTF designed by "f"', the TESM "s" and the metallic wall designed by "p".…”

Section: A Mathematical Modelmentioning

confidence: 99%

“…It consists of thermocline packed-bed single tank filled of rapeseed oil as HTF and quartzite as TESM. More details or specifications in reference [8] [26]. The confrontation between experimental and numerical results is presented in Fig.…”

Section: E Model Validationmentioning

confidence: 99%

Numerical Assessement of Energy Storage Performances of Magnetite and Quartzite for CSP Storage Applications

Baba¹,

Mers²,

Ajdad³

et al. 2019

Proceedings of the 13th International Renewable Energy Storage Conference 2019 (IRES 2019)

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this paper pinpoints the thermal energy storage performances of two TESM, quartzite as classic thermal energy storage material commonly used in CSP and magnetite as emerged thermal energy storage filler material. The TES performances included charge, discharge and cycle efficiencies (utilization rate). In the first place, the developed numerical code for thermocline energy storage is presented and validated. Subsequently, and for both filler materials, the thermocline behavior and TES performances during charging and discharging process are examined. These performances are investigated for two potential scenarios: the first one considers the same storage tank size and the same discharge period. While, the second one, concerned sized storage tank for each combination HTF/TESM. Different heat transfer fluids are utilized involving natural oils, synthetic oils and molten salt. The obtained results showed that no significant difference of the zone thickness between the two materials. Moreover, we noted that quartzite presents slightly higher charge discharge and storage efficiencies. However, magnetite, for the same storage tank size and the same discharge time, magnetite is able to restore a great amount of energy. Furthermore, magnetite requires less storage tank volume. More important, we deduced that the TES performances are not impacted only by the TESM properties but they are also driven by the HTF nature and that molten salts are largely more efficient.

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“…They are mainly focused on the quality of the heat transfers between the HTF and the storage material, both of these elements exhibiting variations in properties depending on temperature. The fact that thermocline systems are always in a transient state implies dynamic modelling [12][13][14][15][16]. The second aspect studied is the influence of the storage material.…”

Section: Introductionmentioning

confidence: 99%

Flexibility and robustness of a high-temperature air/ceramic thermocline heat storage pilot

Ferber

Falcoz

Minh

et al. 2019

Journal of Energy Storage

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A high-temperature air/ceramic thermocline packed-bed heat storage pilot was designed and built to measure the effects of operating parameters and quality of the heat resource on its performance, with a horizontal duct of square section. The influence of inlet air flow rate during the discharging phase and the impact of a degraded inlet heat resource during the charging phase were studied. The results revealed that the horizontal orientation of the bed didn't generate a thermal radial gradient. Results also show that the overall cycle efficiency is weakly affected by the changes in the operating conditions. Thermocline heat storage is surprisingly well-suited to managing resource instabilities. It forms a robust, flexible high temperature storage system applicable for industrial use to recover and deliver erratically produced waste heat.

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A thermocline thermal energy storage system with filler materials for concentrated solar power plants: Experimental data and numerical model sensitivity to different experimental tank scales

Cited by 127 publications

References 31 publications

Thermodynamic Analysis of High‐Temperature Energy Storage Concepts Based on Liquid Metal Technology

Thermodynamic Analysis of High‐Temperature Energy Storage Concepts Based on Liquid Metal Technology

Numerical Assessement of Energy Storage Performances of Magnetite and Quartzite for CSP Storage Applications

Flexibility and robustness of a high-temperature air/ceramic thermocline heat storage pilot

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