Experimental and numerical investigation of a pilot-scale thermal oil packed bed thermal storage system for CSP power plant

Bruch, Arnaud; Fourmigué, Jean-François; Couturier, Raphaël

doi:10.1016/j.solener.2014.03.019

Cited by 124 publications

(54 citation statements)

References 32 publications

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“…Furthermore, this system has already been investigated for molten salt and thermal oil [41], [38]. Compared to the direct two tank system the amount of sodium can be significantly reduced.…”

Section: Resultsmentioning

confidence: 99%

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Assessment of thermal energy storage options in a sodium-based CSP plant

Niedermeier

Flesch

Marocco

et al. 2016

Applied Thermal Engineering

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Section: Resultsmentioning

confidence: 99%

“…The void fraction is set to 0.25, similar to [8], [41]. In a review of Singh et al [42] void fractions of 0.136 to 0.67 are listed depending on the storage material.…”

Section: Storage Medium Costmentioning

confidence: 99%

Assessment of thermal energy storage options in a sodium-based CSP plant

Niedermeier

Flesch

Marocco

et al. 2016

Applied Thermal Engineering

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“…Some of them are based on the two-phase Schumann model whose solutions are two temperature equations (one for the solid and one for the fluid) obtained mainly by numerical methods [6,7,8,9]. However, when the fluid is a liquid, an effective single-phase storage medium can be assumed and, in this case, the temperature equation can be obtained either by simple numerical methods [10] or by using analytical functions [11,12,13,14,15].…”

Section: Introductionmentioning

confidence: 99%

Study of thermocline development inside a dual-media storage tank at the beginning of dynamic processes

Esence

Bayón²,

Bruch

et al. 2017

AIP Conference Proceedings

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Operating results of a thermocline thermal energy storage included in a parabolic trough mini power plant AIP Conference Proceedings 1850, 080010 (2017) Abstract. This work presents some of the experimental results obtained during a test campaign performed at the STONE facility of CEA-Grenoble in collaboration with CIEMAT-PSA supported by both the SFERA-II and the STAGE-STE project. This installation consists of a thermocline tank with thermal oil and rock/sand filler and the tests aimed to study the development of the temperature profile inside the tank at the beginning of charge/discharge processes. The investigation of how this profile is created and which is its dependence on the experimental parameters is crucial for predicting the behavior of a dual-media thermocline tank. Tests have been performed for dynamic processes from initial states with constant uniform temperature or with a thermal gradient already present due to a partial thermocline zone extraction in the former process. Tests at different fluid velocities and temperatures have been carried out as well, in order to evaluate the influence of operating conditions. When a dynamic process of charge or discharge is started, the development of the thermal front is very sharp and localized at tank top or bottom if initial tank temperature is uniform, whereas it is less pronounced if the test begins from a non-thermally uniform initial state. In terms of operating conditions, it has been observed that the development of the thermocline thermal front is independent not only of the fluid velocity but also of its temperatures, within the working ranges here considered. Due to these experimental results, it will be possible to improve simulation models for thermocline tanks and hence to predict their behavior more accurately, especially when they are implemented in annual simulations of CSP plants.

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“…In this model, a cylindrical system geometry was assumed and the effect of heat loss from lateral walls for charging temperatures of 1200 • C was evaluated, assuming both fluid and the solid thermophysical properties to be temperature-independent. Packed bed systems with different HTFs such as molten salt or thermal oil were also investigated, including a pilot-scale oil/rock thermocline TES system which was numerically and experimentally studied [22]. A one-dimensional model based on two energy equations was developed and validated with experimental data for both single and multiple charge/discharge phases.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Research Activity on a Packed Bed TES System

et al. 2016

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This paper presents the results of experimental and numerical research activities on a packed bed sensible thermal energy storage (TES) system. The TES consists of a cylindrical steel tank filled with small alumina beads and crossed by air used as the heat transfer fluid. Experimental tests were carried out while varying some operating parameters such as the mass flow rate, the inlet-outlet temperature thresholds and the aspect ratio (length over diameter). Numerical simulations were carried out using a one-dimensional model, specifically developed in the Matlab-Simulink environment and a 2D axisymmetric model based on the ANSYS-Fluent platform. Both models are based on a two-equation transient approach to calculate fluid and solid phase temperatures. Thermodynamic properties were considered to be temperature-dependent and, in the Computational Fluid Dynamics (CFD) model, variable porosity of the bed in the radial direction, thermal losses and the effective conductivity of the alumina beads were also considered. The simulation results of both models were compared to the experimental ones, showing good agreement. The one-dimensional model has the advantage of predicting the axial temperature distribution with a very low computational cost, but it does not allow calculation of the correct energy stored when the temperature distribution is strongly influenced by the wall. To overcome this problem a 2D CFD model was used in this work.

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Experimental and numerical investigation of a pilot-scale thermal oil packed bed thermal storage system for CSP power plant

Cited by 124 publications

References 32 publications

Assessment of thermal energy storage options in a sodium-based CSP plant

Assessment of thermal energy storage options in a sodium-based CSP plant

Study of thermocline development inside a dual-media storage tank at the beginning of dynamic processes

Experimental and Numerical Research Activity on a Packed Bed TES System

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