13 results on '"Bruch, Arnaud"'
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2. Industrial scale cTES cold thermal energy storage: Demonstrator in La Africana CSP power plant and evaluation of benefits - SOLWARIS project.
- Author
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Bruch, Arnaud, Patchigolla, Kumar, Asfand, Faisal, Turner, Peter, Monte, Luis Millán, Douard, Sylvie, and Richter, Christoph
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HEAT storage , *POWER plants , *COOLING systems , *CONSTRUCTION planning , *WATER consumption , *BATTERY storage plants - Abstract
A 1000 m3 prototype of cold Thermal Energy Storage cTES is currently under design to be installed on the condenser cooling circuit of La Africana CSP power plant in Spain. This high TRL prototype is a proof-of-concept of the cTES concept at large scale, in real environment and real operations. The design step is almost completed and the engineering step has already begun. Construction is planned to be performed in 2020 and commissioning may start at the end of 2020. In parallel, benefits of the integration of cTES as additional cooling system has been evaluated fir the specific case of La Africana power plant, for both electricity production and water consumption. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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3. Industrial-Scale Prototype of cTES for Water Consumption Reduction and Power Block Efficiency Improvement - SOLWATT PROJECT.
- Author
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Bruch, Arnaud, Patchigolla, Kumar, Asfand, Faisal, Millán Monte, Luis, Peón Menéndez, Rogelio, Douard, Sylvie, and Bourdon, Delphine
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WATER consumption , *HEAT storage , *SOLAR stills , *PROTOTYPES , *COOLING of water , *CONDENSERS (Vapors & gases) - Abstract
SOLWATT project started in May 2018 and involve 9 partners (4 research organizations CEA, CIEMAT, CRANFIELD UNIVERSITY and DLR- and 5 industrial partners TSK, BRIGHTSOURCE, FENIKS, RIOGLASS and TECKNIKER). SOLWATT project is devoted to the reduction of water consumption in CSP power plant. For this purpose, mirror field cleaning, turbine condenser cooling and water recovery are considered. Present paper is devoted more particularly to the cTES industrial prototype (cold thermal energy storage) used to reduce the water consumption related to condenser cooling. The cTES is based on a single-media thermocline storage used to partially or totally store the heat flow from the condenser when ambient temperatures are too high. Storage discharge is performed during the night. A 1000 m3 cTES prototype will be designed and constructed in the 50 MWe La Africana CSP power plant. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
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4. Cold Thermal Energy Storage cTES for Optimized Cooling of CSP Power Plant Power Block – WASCOP Project.
- Author
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Bruch, Arnaud, Bourdon, Delphine, Camus, Adrien, Dumas, Christophe, and Chouvel-Saye, Alexandre
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SOLAR power plants , *HEAT storage , *POWER plants , *COOLING , *SOLAR energy , *TURBINE efficiency , *LOW temperatures - Abstract
The WASCOP (Water Saving for Concentrated Solar Power) project is an EU project dedicated to water saving in CSP power plants. Among the different technologies and aspects considered in the project, the concept of cold thermal energy storage (cTES) has been developed. cTES is considered in addition to the cooling system and used when ambient temperature is too high and may lead to turbine efficiency and electricity production reductions. In these conditions, heat from the condenser is partially stored in the cTES and evacuated trough the available cooler when ambient temperature is lower, typically during the night. A prototype of cTES has been built in the CEA site of Cadarache. Preliminary commissioning has been performed. Final commissioning is expected to be done before Spring 2019 and experimental tests will be made during Summer 2019. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
5. Numerical Induced Thermal Stresses on Walls of Thermocline Storage Tank.
- Author
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Sassine, Nahia, Donzé, Frédéric-Victor, Bruch, Arnaud, and Harthong, Barthélémy
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WALLS ,STORAGE tanks ,THERMAL stresses ,HEAT storage ,TEMPERATURE lapse rate ,DISCRETE element method - Abstract
Thermal Energy Storage (TES) systems are central elements of various types of power plants operated using renewable energy sources. Packed bed TES can be considered as a cost–effective solution in concentrated solar power plants (CSP). Such a device is made up of a tank filled with a granular bed through which heat-transfer fluid circulates. However, in such devices, the thermal stresses may accumulate from cycle to another due to differential thermal dilatation between filler and tank walls, leading to plastic deformations in the tank shell and the failure of the tank might happen. This paper aims at studying the evolution of tank wall stresses over thermal cycles, taking into account both thermal and mechanical loads, with a numerical model based on the discrete element method (DEM). A higher thermal expansion coefficient is used for the wall compared to the granular medium, allowing the settlement of particles during the loading phases, then an increase of induced stresses during the unloading phases due to the wall contraction against the settled particles. Simulations were performed to study two different thermal configurations: (i) the tank is heated homogenously along its height or (ii) with a vertical gradient of temperature. Then, the resulting loading stresses applied on the tank are compared as well the response of the tank wall. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
6. Thermocline Energy Storage: Influence of Fluid Distribution into Porous Media.
- Author
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Bellenot, Grégoire, Bentivoglio, Fabrice, Marty, Philippe, Bruch, Arnaud, and Coudrais-Duhamel, Michel
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POROUS materials ,ENERGY storage ,HEAT storage ,STORAGE tanks ,HEAT ,GRANULAR materials - Abstract
Thermocline energy storage is a way to store thermal energy by keeping two distinct zone of temperature in a tank, separated by a thin transition zone. Some applications use a granular porous media, filling the storage tank, through which passes the heat-transfer fluid. Most of scientific papers concerning this kind of technology assume that an ideal distribution of the fluid into the porous media is a homogeneous distribution over the diameter of the tank. On the other side, a recent numerical study concludes that a non-homogeneous distribution leads to better storage performances. Considering theses contradictory statements and the limited number of studies concerning the impact of distribution over thermal storage performances, a numerical simulation model is developed to investigate. This model is validated with data from the experimental device existing in CEA, in cases without distribution issues. Planned modifications of the experimental device for investigation of fluid’s distribution and validation of the model in such cases are presented. [ABSTRACT FROM AUTHOR]
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- 2019
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7. Extended Modeling of Packed-bed Sensible Heat Storage Systems.
- Author
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Esence, Thibaut, Bruch, Arnaud, Fourmigué, Jean-François, and Stutz, Benoit
- Subjects
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HEAT storage , *PARTICLES , *SINGLE-phase flow , *THERMODYNAMIC equilibrium - Abstract
An original modeling approach for packed-bed heat storage systems based on the combination of an intra-particle conduction model and a single-phase model is presented. The intra-particle conduction approach enables to model the solid phase whatever the dimensionless Biot number of the particles of the packed bed. The single-phase model approach is used when a part of the packed bed consists of very small particles like sand. This approach assumes thermal equilibrium between the fluid and the small particles. In addition, an energy equation dedicated to the tank wall enables to model small storage systems in which the influence of the wall is significant. The resulting one-dimensional three phase model has been validated with the liquid/solid and the gas/solid heat storage systems of the French Atomic Energy Commission (CEA). Since the model has been validated on two very different setups with various cyclic operating conditions, it is likely to enable accurate and affordable modeling of a wide range of packed-bed heat storage configurations. [ABSTRACT FROM AUTHOR]
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- 2018
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8. Numerical Analysis of Granular Bed Behavior in Thermocline Storage Tank and Bed/Wall Interactions.
- Author
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Sassine, Nahia, Donzé, Frédéric-Victor, Bruch, Arnaud, and Harthong, Barthélémy
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HEAT storage ,SOLAR power plants ,RENEWABLE energy sources ,THERMAL stresses ,GRANULAR materials - Abstract
Thermal Energy Storage (TES) systems are central elements of various types of power plants operated using renewable energy sources. Packed bed TES can be considered as a cost-effective solution in concentrated solar power plants (CSP). Such a device is made up of a tank filled with a granular bed through which heat-transfer fluid circulates. However, in such devices, the thermal stresses may accumulate from cycle to another due to differential thermal dilatation between filler and tank walls, leading to plastic deformations in the tank shell and the failure of the tank might happen. This paper aims at studying the evolution of tank wall stresses over granular bed thermal cycles, taking into account both thermal and mechanical loads, with a numerical model based on the discrete element method (DEM). Simulations were performed to study two different thermal configurations: (i) the tank is heated homogenously along its height or (ii) with a vertical gradient of temperature. Then, the resulting loading stresses applied on the tank are compared as well the response of the internal granular material. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
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9. Experimental Investigation of the Solid Filler Influence in Thermocline Storage Systems through the Comparison of Two Different Setups.
- Author
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Esence, Thibaut, Fasquelle, Thomas, Bruch, Arnaud, and Falcoz, Quentin
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HEAT transfer fluids ,THERMOCLINES (Oceanography) ,HEAT storage ,SOLID-liquid interfaces ,FLUIDS - Abstract
Two liquid/solid thermocline heat storage systems are compared. Both setups have similar size and operate with thermal oil as heat transfer fluid but one consists of a packed bed of alumina spheres with a void fraction of 0.485, while the other consists of a packed bed of rock and sand with a void fraction of 0.270. A dimensionless approach based on the thermal front velocity (i.e. the velocity of the thermocline) and the discharge efficiency is used to compare the thermal behavior of the two setups. The comparison shows that the dimensionless behavior of both systems is very similar and seems insensitive to the operating conditions in the range tested (temperature level and fluid flow). This dimensionless approach is therefore promising to analyze and size thermocline heat storage systems. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
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10. A versatile one-dimensional numerical model for packed-bed heat storage systems.
- Author
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Esence, Thibaut, Bruch, Arnaud, Fourmigué, Jean-François, and Stutz, Benoit
- Subjects
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HEAT storage , *PACKED bed reactors , *SOLAR power plants , *PARTICLE size determination , *HEAT transfer - Abstract
Abstract Thanks to their versatility and their relatively low cost, packed-bed sensible heat storage systems are promising for various applications like in concentrated solar power plants, adiabatic compressed energy storage and pumped thermal energy storage. A versatile one-dimensional numerical model able to describe many packed-bed configurations is developed and presented. This model is able to treat liquid and gaseous heat transfer fluids, and packed bed with a monomodal or a bimodal particle size repartion, i.e. consisting of a mixture of large and small solid particles (such as rocks and sand). This configuration is commonly encountered in the literature due to the advantages it procures. The model is compared and validated with specific experimental data and results from the literature covering wide ranges of configurations and operating conditions: several heat transfer fluids (molten salts, thermal oil, air), solid materials (rocks, sand, ceramics), fluid velocities, temperature levels and packed bed configurations are successfully tested. This shows the versatility of the developed model. The influence of the fluid velocity on heat losses, thermal diffusion and fluid/solid heat exchange are analysed. It enables to determine the optimal velocity which maximizes the performance of the storage system. Highlights • Description of a versatile numerical model for packed-bed heat storage systems. • Relevant approaches and correlations to compute a priori heat transfer coefficients. • Validation of the model in various configurations with experimental data. • Utilization of the model to investigate the fluid velocity influence. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
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11. Rock-Bed Thermocline Storage: A Numerical Analysis of Granular Bed Behavior and Interaction with Storage Tank.
- Author
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Sassine, Nahia, Donzé, Frédéric-Victor, Bruch, Arnaud, and Harthong, Barthélemy
- Subjects
HEAT storage ,SOLAR power plants ,THERMOCLINES (Oceanography) ,NUMERICAL analysis ,STORAGE tanks ,HEAT transfer - Abstract
Thermal Energy Storage (TES) systems are central elements of various types of power plants operated using renewable energy sources. Packed bed TES can be considered as a cost-effective solution in concentrated solar power plants (CSP). Such a device is made up of a tank filled with a granular bed through which heat-transfer fluid circulates. However, in such devices, the tank might be subjected to catastrophic failure induced by a mechanical phenomenon known as thermal ratcheting. Thermal stresses are accumulated during cycles of loading and unloading until the failure happens. This paper aims at studying the evolution of tank wall stresses over granular bed thermal cycles, taking into account both thermal and mechanical loads, with a numerical model based on the discrete element method (DEM). Simulations were performed to study two different thermal configurations: (i) the tank is heated homogenously along its height or (ii) with a vertical gradient of temperature. Then, the resulting loading stresses applied on the tank are compared as well the response of the internal granular material. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
12. A review on experience feedback and numerical modeling of packed-bed thermal energy storage systems.
- Author
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Esence, Thibaut, Bruch, Arnaud, Molina, Sophie, Stutz, Benoit, and Fourmigué, Jean-François
- Subjects
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ELECTRONIC feedback , *HEAT storage , *POWER resources , *HEAT transfer , *SOLAR energy - Abstract
Solar thermal energy is a clean, climate-friendly and inexhaustible energy resource. It is therefore promising to cope with fossil fuel depletion and climate change. Thermal storage enables to make this intermittent energy resource dispatchable, reliable on demand and more competitive. Nowadays, most of the concentrated solar power plants equipped with integrated thermal storage systems use the two-tank molten salt technology. Despite its relative simplicity and efficiency, this technology is expensive and requires huge amounts of nitrate salts. In the short to medium term, packed-bed thermal energy storage with either liquid or gaseous heat transfer fluid is a promising alternative to reduce storage costs and hence improve the development of solar energy. To design reliable, efficient and cost-effective packed-bed storage systems, this technology, which involves many physical phenomena, has to be better understood. This paper aims to sum up some key aspects about design, operation, and performances of packed-bed storage systems. In the first part, most representative setups and their experience feedback are presented. The controllability of packed-bed storage systems and the special influence of thermal stratification are pointed out. In the second part, the various numerical models used to predict packed-bed storage performances are reviewed. In the last part, some useful correlations enabling to quantify the main physical phenomena involved in packed-bed operation and modeling are presented and compared. The correlations investigated enable to calculate fluid/solid and fluid/wall heat transfer coefficients, effective thermal conductivity and pressure drop in packed beds. [ABSTRACT FROM AUTHOR]
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- 2017
- Full Text
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13. Experimental study and numerical modelling of high temperature gas/solid packed-bed heat storage systems.
- Author
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Esence, Thibaut, Desrues, Tristan, Fourmigué, Jean-François, Cwicklinski, Grégory, Bruch, Arnaud, and Stutz, Benoit
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HIGH temperatures , *HEAT storage , *NUCLEAR energy , *HEAT , *BASALT , *POROUS materials - Abstract
Two pilot-scale regenerative heat storage systems have been tested by the French Alternative Energies and Atomic Energy Commission (CEA). The first one is a 1.1-MWh th structured packed bed consisting of ceramic plates forming corrugated channels. The second one is a 1.4-MWh th granular packed bed consisting of basaltic rocks enclosed by refractory walls. The two regenerators were tested over a hundred of thermal cycles between 80 °C and 800 °C with different fluid mass flows. Both systems showed their ability to store heat efficiently and to provide thermal energy at a stable temperature for the most part of the discharge process. The granular packed bed exhibited large transverse thermal heterogeneities due to flow channelling in the corners of the cross section. However, this phenomenon appears not to have degraded significantly the thermal performances, and the average one-dimensional thermal behaviour of the system may be assessed by the surface weighted average of the temperature over the bed cross section. Compared to the granular packed bed, the structured bed showed comparable thermal performances while inhibiting flow heterogeneities and reducing by up to 54% the average pressure drop. Furthermore, at the end of the test campaign, the packed beds were observed and compared from a mechanical point of view. The thermal results were successfully simulated over numerous charge/discharge cycles by using a one-dimensional numerical model. This is significant since the discrepancies between experimental and numerical results are likely to accumulate from a cycle to the other. The model considers the packed beds as continuous and homogeneous porous media but takes the conduction resistances within the solid filler and the walls into account. The pressure drop of the beds was computed using a correlation developed from a previous CFD study for the structured packed bed, and the Ergun equation for the granular packed bed. Compared to experimental data, these correlations enabled to estimate the order of magnitude and the evolution trend of the pressure drop with an average deviation ranging from −7.2% to +61.9%. For the granular packed bed, these deviations are ascribed to the flow heterogeneities and the shape of the rocks which are not taken into account in the Ergun equation. • Experimental testing of two pilot-scale gas/solid packed-bed heat storage systems. • Investigation of the cycling behaviour with various mass flows. • Ability of the tested storages to provide useful heat at constant temperature. • Successful simulation of the results thanks to a one-dimensional numerical model. • Average one-dimensional behaviour of the storage almost unaffected by significant flow channelling. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
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