Particle circulation loops in solar energy capture and storage: Gas–solid flow and heat transfer considerations

Zhang, Huili; Benoit, Hadrien; Gauthier, Daniel J.; Degrève, Jan; Baeyens, Jan; López, Inmaculada Pérez; Hémati, Mehrdji; Flamant, Gilles

doi:10.1016/j.apenergy.2015.10.005

Cited by 89 publications

(49 citation statements)

References 66 publications

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“…Gas or air is used as an HTF for very-high-temperature storage systems; however, storage is not possible at these temperatures, but there is a possibility to use gas turbines or Stirling engines at these temperatures. 29…”

Section: Tes Classificationsmentioning

confidence: 99%

“…At present, for novel HTFs, powders are used as HTFs to carry the heat to a storage medium and are applicable for the higher‐efficiency power generation cycles and high‐temperature storages. Gas or air is used as an HTF for very‐high‐temperature storage systems; however, storage is not possible at these temperatures, but there is a possibility to use gas turbines or Stirling engines at these temperatures …”

Section: Introductionmentioning

confidence: 99%

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Review on solar thermal energy storage technologies and their geometrical configurations

Suresh

Saini

2020

Int J Energy Res

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Summary Because of the unstable and intermittent nature of solar energy availability, a thermal energy storage system is required to integrate with the collectors to store thermal energy and retrieve it whenever it is required. Thermal energy storage not only eliminates the discrepancy between energy supply and demand but also increases the performance and reliability of energy systems and plays a crucial role in energy conservation. Under this paper, different thermal energy storage methods, heat transfer enhancement techniques, storage materials, heat transfer fluids, and geometrical configurations are discussed. A comparative assessment of various thermal energy storage methods is also presented. Sensible heat storage involves storing thermal energy within the storage medium by increasing temperature without undergoing any phase transformation, whereas latent heat storage involves storing thermal energy within the material during the transition phase. Combined thermal energy storage is the novel approach to store thermal energy by combining both sensible and latent storage. Based on the literature review, it was found that most of the researchers carried out their work on sensible and latent storage systems with the different storage media and heat transfer fluids. Limited work on a combined sensible‐latent heat thermal energy storage system with different storage materials and heat transfer fluids was carried out so far. Further, combined sensible and latent heat storage systems are reported to have a promising approach, as it reduces the cost and increases the energy storage with a stabilized outflow of temperature from the system. The studies discussed and presented in this paper may be helpful to carry out further research in this area.

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Section: Tes Classificationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Review on solar thermal energy storage technologies and their geometrical configurations

Suresh

Saini

2020

Int J Energy Res

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“…Concentrated Solar Power (CSP) uses heliostats to focus solar irradiation onto a receiver where a heat transfer fluid (HTF) is used as heat collector and carrier [1][2][3] . Although currently more expensive than other renewable energy sources such as photovoltaic cells and wind turbines, improvements can reduce operating costs and make CSPs more competitive by exploiting their advantages of possible hybridization, high efficiency, ease of thermal energy storage, and good scale-up potential [1][2][3][4][5] . The key to further economies is to operate at higher temperatures, allowing higher power conversion efficiencies and higher storage temperatures with increased energy storage density 3 .…”

Section: Introductionmentioning

confidence: 99%

“…The key to further economies is to operate at higher temperatures, allowing higher power conversion efficiencies and higher storage temperatures with increased energy storage density 3 . This fostered the development of using particle suspensions as HTF [1][2][3][4][5] . The increased thermodynamic efficiency will moreover ttps://doi.org/10.1063/1.5117650 reduce the heliostat field and energy storage, recognized as more efficient and less expensive.…”

Section: Introductionmentioning

confidence: 99%

The fluidized bed air heat exchanger in a hybrid Brayton-cycle solar power plant

Kong

Zhang

et al. 2019

AIP Conference Proceedings

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This is an author's version published in: http://oatao.univ-toulouse.fr/24239 The fluidized bed air heat exchanger in a hybrid Brayton-cycle solar power plant.Abstract. Using group A particle suspensions as heat transfer fluid in concentrated solar power plants leads to higher efficiency and lower costs. Combined cycle power generation becomes possible with e.g. a topping Brayton air turbine cycle and an advanced steam power block as bottoming cycle. This hybrid combined cycle solar tower power plant will be tested on a 3 MWth pilot-scale at the CNRS-Themis solar tower (France) with the receiver, hot powder storage and air Brayton turbine. The suspension will exit the receiver at a nominal outlet temperature of 750-800°C. Hot powders will be stored and will subsequently exchange heat with the turbine air. The outlet temperature of the air heat exchanger (625 to 700 °C) will considerably determine the hybrid operation (reducing the possibly used fossil fuel boost) and the heat exchanger design is of paramount importance. The air heat exchanger will be a baffled cross-flow fluidized bed. Air will be heated in an in-bed finned-tube bundle. Air will be fed at 5.8 bar and ~ 270°C. The hydrodynamics and heat transfer characteristics of the air heat exchanger were experimentally investigated towards bubble properties and heat trasnfer coefficient. The bed to tube heat transfer coefficient was measured for different pipe geometries at bed temperatures up to 700 °C, exceeding 2 kW/m 2 K for a twin-bore finned tube but only about 650 W/m²K for the bare tube of equal outside diameter. The heat transfer coefficient from the tube wall to the turbulent air flow inside the tube (~ 325 W/m 2 K) determines the design. NEPTUNE_CFD software was used to perform 3D-numerical simulations of the fluidized bed hydrodynamics via an Eulerian n-fluid approach. Simulation and experimental results were in very fair agreement, stressing the capability of mathematical models to predict the behaviour of a cross-flow bubbling fluidized bed.

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“…The development of solid particle receivers in Concentrated Solar Power (CSP) applications is gaining much interest [1][2][3][4]. Among particle receivers, dense gas-solid fluidized suspensions have been recently proposed as heat transfer fluid (HTF) and thermal energy storage media [3][4][5][6][7][8] thanks to their excellent thermal properties, namely bed-to-wall heat transfer coefficient (several hundreds of W/m 2 K) and effective thermal diffusivities (0.001-0.1m 2 /s) associated with convective transfer due to bubble-induced and gross bed solids circulation [9][10][11]. Both these features may be optimized by proper selection of fluidized solids type and size and fluidization regime.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamics of compartmented fluidized beds under uneven fluidization conditions

et al. 2017

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Fluidized beds may be conveniently applied to demanding thermal and thermochemical processes thanks to their inherently good thermal performances: bed-to-surface heat transfer coefficients, effective thermal diffusivities. Collection and thermal storage of solar radiation in Concentrated Solar Power (CSP) systems is one challenging example of this application. Thermal properties may be further enhanced by non-conventional design and operation of fluidized beds based on uneven or unsteady (pulsed) fluidization. A novel concept of solar receiver for CHP (combined heat and power) generation consisting of a compartmented dense gas fluidized bed has been proposed to effectively accomplish collection of incident solar radiation, heat transfer to the working fluid of the thermodynamic cycle and thermal energy storage. This application, like others of the same kind, poses the objective of achieving controlled compartmentation of a large scale fluidized bed by selectively promoting fluidization in some regions while keeping others in a fixed state. This task may be accomplished by means of a compartmented windbox, without physical partitioning or internals immersed in the bed. This study addresses this problem by investigating the hydrodynamics of a near-2D dense gas-fluidized bed operated at ambient conditions and equipped with a compartmented fluidizing gas distributor. The hydrodynamics was characterized by pressure measurement at different locations in the bed to mark the onset of local fluidization and to map the extension and location of fluidized and de-fluidized regions in the bed for different choices of operating conditions. An important follow-up of the study is the analysis of the dynamics of the bubble and emulsion phase in an unevenly fluidized bed. Dynamical patterns of bubble and emulsion phases have been scrutinized by analysis of space-and time-resolved void fraction profiles obtained by electrical capacitance measurements.Altogether results indicate that a perfectly compartmented fluidized bed cannot be obtained simply using a compartmented windbox. However a proper choice of fluidizing gas partitioning between the compartments enables good control of the local fluidization conditions, of gas cross-flow between the compartments, of large-scale solids circulation.

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Particle circulation loops in solar energy capture and storage: Gas–solid flow and heat transfer considerations

Cited by 89 publications

References 66 publications

Review on solar thermal energy storage technologies and their geometrical configurations

Review on solar thermal energy storage technologies and their geometrical configurations

The fluidized bed air heat exchanger in a hybrid Brayton-cycle solar power plant

Hydrodynamics of compartmented fluidized beds under uneven fluidization conditions

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