Thermal energy storage technologies for concentrated solar power – A review from a materials perspective

Palacios, Anabel; Barreneche, Camila; Navarro, María Elena; Ding, Yulong

doi:10.1016/j.renene.2019.10.127

Cited by 254 publications

(94 citation statements)

References 66 publications

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“…The research results show that constant-phase bed storages achieve similar efficiencies to phase-change bed storages, however, they are characterized by a lower investment cost [5]. They are used in solar power plants [6], in buildings for room heating or for the drying of premises [7], as a part of solar dryers [8], in greenhouses to ensure the right temperature for plants [9], as waste heat storages, or in cooperation with the Organic Rankine Cycle [10]. In such installations, air dominates as the working medium [11], and other working factors, such as e.g., synthetic heat transfer fluid that is based on eutectic mixtures, are less frequently analysed [12].…”

Section: Introductionmentioning

confidence: 89%

Experimental Determination of the Influence of Shape on the Heat Transfer Process in a Crushed Granite Storage Bed

Nemś¹

2020

Energies

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The article presents the problem of modelling the charging of a constant-phase bed storage in the first hours of the process. The places of errors in the heat transfer calculations for the packed beds were indicated. Granite in the shape of spheres and crushed rocks, with a characteristic dimension of 50 mm, was used for the experimental tests. The material was subjected to tomographic examination and then used as a storage material. The charging process was carried out for three flow rates: 0.006, 0.008 and 0.010 m3/s. After three hours of testing, the temperature of the outlet air for the granite sphere as the storage material was the same as for the granite crushed rock. However, the biggest differences occurred after 1 h of charging. They were equal to: 40.4% for the flow rate of 0.006 m3/s, 22.0% for the flow rate of 0.008 m3/s, and 18.5% for the flow rate of 0.010 m3/s. The differences were greater than the uncertainty of the measurements. As a result, different temperatures of the storage material were obtained. After three hours, they were equal to: 25.2%, 12.3% and 8.6% for the lowest, medium, and highest airflow, respectively. The conducted heat transfer analysis and the relationship Nu = f(Re) was determined. The influence of the calculated and actual surface of the crushed rock on the heat exchange process was explained. For all the tested air flow rates through the bed, higher thermal parameters were obtained for the crushed rock than for the sphere. The maximum differences in the Nu number were: 222.6%, 151.4% and 161.3% for the flow of 0.006, 0.008 and 0.010 m3/s, respectively. This means that the description of the heat exchange process in the piled beds would require a parameter that takes into account the geometry of the storage material.

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Section: Introductionmentioning

confidence: 89%

Experimental Determination of the Influence of Shape on the Heat Transfer Process in a Crushed Granite Storage Bed

Nemś¹

2020

Energies

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“…The material research on molten salt related aspects is diverse. Some review and overview publications on molten salt and other storage materials are available [2,[5][6][7][8][9][10]. Tab.…”

Section: Molten Salt As Heat Transfer and Storage Mediummentioning

confidence: 99%

“…Comparison of two‐tank molten salt storage system in CSP with alternative technologies using other storage materials and HTFs 2, 10, 80–84:…”

Section: Commercial Molten Salt Storage Systems In Concentrating Solamentioning

confidence: 99%

Molten Salt Storage for Power Generation

Bauer

Odenthal

Bonk

2021

Chemie Ingenieur Technik

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Storage of electrical energy is a key technology for a future climate‐neutral energy supply with volatile photovoltaic and wind generation. Besides the well‐known technologies of pumped hydro, power‐to‐gas‐to‐power and batteries, the contribution of thermal energy storage is rather unknown. At the end of 2019 the worldwide power generation capacity from molten salt storage in concentrating solar power (CSP) plants was 21 GWhel. This article gives an overview of molten salt storage in CSP and new potential fields for decarbonization such as industrial processes, conventional power plants and electrical energy storage.

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“…An example of this is the great advances made in the efficiency of solar energy by using thermal energy storage (TES) systems. At present, more than 70% of concentrated solar power (CSP) projects have integrated TES systems 2 , and such power plants reached an installed capacity of 4.5 GW at the end of 2019 3 . Due to the importance of the storage systems for the viability of CSP technology, it is necessary to keep on improving them by increasing both their energy efficiency and their capacity of continuously generating electricity, without forgetting their competitiveness from an economic point of view.…”

Section: Introductionmentioning

confidence: 99%

Understanding the abnormal thermal behavior of nanofluids through infrared thermography and thermo-physical characterization

Svobodova-Sedlackova

Calderón

Barreneche

et al. 2021

Sci Rep

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Nanofluids (NFs) are colloidal suspensions of nanoparticles (NPs) within a base fluid. Unlike conventional mixtures, NFs exhibit dramatically enhanced properties, such as an abnormal increase in heat capacity at low concentration of NPs (e.g., Cp values 30% higher than the base material value). Understanding the thermo-physical behavior of NFs is essential for their application as thermal energy storage systems. In this study, we analyze a sodium nitrate ionic system containing 1 wt%, 3 wt% and 7 wt% of SiO2 NPs with different techniques like infrared thermography, infrared spectroscopy and differential scanning calorimetry (DSC) in order to shed light on the mechanism behind the increase of Cp. The themographies reveal the presence of a colder layer on top of the NF with 1 wt% of NPs whereas this layer does not appear at higher concentrations of NPs. The IR spectrum of this foamy top layer evidences the high amount of SiO2 bonds suggesting the clustering of the NPs into this layer linked by the nitrate ions. The linking is enhanced by the presence of hydroxyls in the NPs’ surface (i.e., hydroxilated NPs) that once mixed in the NF suffer ionic exchange between OH− and NO3− species, leading to O2–Si–O–NO2 species at the interface where a thermal boundary resistance or Kapitza resistance appears (RT = 2.2 m2 K kW−1). Moreover, the presence of an exothermic reactive processes in the calorimetry of the mixture with 1 wt% of NPs evidences a reactive process (ionic exchange). These factors contribute to the heat capacity increase and thus, they explain the anomalous behavior of the heat capacity in nanofluids.

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Thermal energy storage technologies for concentrated solar power – A review from a materials perspective

Cited by 254 publications

References 66 publications

Experimental Determination of the Influence of Shape on the Heat Transfer Process in a Crushed Granite Storage Bed

Experimental Determination of the Influence of Shape on the Heat Transfer Process in a Crushed Granite Storage Bed

Molten Salt Storage for Power Generation

Understanding the abnormal thermal behavior of nanofluids through infrared thermography and thermo-physical characterization

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