Experimentation of a High Temperature Thermal Energy Storage Prototype Using Phase Change Materials for the Thermal Protection of a Pressurized Air Solar Receiver

Verdier, D.; Ferrière, Alain; Falcoz, Quentin; Siros, Frédéric; Couturier, Raphaël

doi:10.1016/j.egypro.2014.03.112

Cited by 21 publications

(14 citation statements)

References 6 publications

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“…High-temperature differences (e.g., ∆T >50°C) are expected in using a LHTES system, particularly for protection purposes when a fast response is required, e.g. protecting the receiver from high temperatures as proposed by Verdier et al [5].…”

Section: Introductionmentioning

confidence: 99%

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Numerical study of melting process of a high-temperature phase change material including natural convection and turbulence

Riahi¹,

Saman²,

Bruno³

et al. 2017

Int. J. CMEM

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The design and optimisation of a latent heat thermal storage system require knowledge of flow, heat and mass transfer during the melting (charging) and solidification (discharging) processes of hightemperature phase change materials (PCMs). Using fluent, numerical modeling was performed to study the impact of natural convection and turbulence in the melting process of a high-temperature PCM in a latent heat storage system with Ra = 10 12. Numerical calculation was conducted, considering a two dimensional symmetric grid of a dual-tube element in a parallel flow shell and tube configuration where the heat transfer fluid passes through the tube and PCM fills the shell. Three melting processes of PCM were considered; pure conduction, conduction and natural convection, and finally the latter with turbulence. The first study showed a one dimensional melt front, evolving parallel to the tube, which results in lower peak temperatures and temperature gradients, higher heat transfer area for a longer period of time, however lower heat transfer rate due to natural convection being ignored. The second study presented a two dimensional melt front which evolves mainly perpendicular to the tube, shrinking downward, resulting in the loss of heat transfer area and higher peak temperatures and temperature gradient, however, the higher rate of heat transfer rate due to the creation of convection cells which facilitate mass and heat transfer. Including turbulence led to a higher mixing effect due to the higher velocity of convection cells, resulting in a more uniform process with lower peak temperature and temperature gradients and higher heat transfer rate. In a melting process with Ra>10 11 , including convection and turbulence impact provides more realistic data of flow, mass and heat transfer.

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Section: Introductionmentioning

confidence: 99%

“…In other numerical work, Verdier et al [5] studied the charging and discharging process in a rectangular LHTES system, with a high-temperature difference between the heat source and sink, e.g. ∆T = 200°C.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of melting process of a high-temperature phase change material including natural convection and turbulence

Riahi¹,

Saman²,

Bruno³

et al. 2017

Int. J. CMEM

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“…Given that Q and f l (t) vary with time, another thermal variable (W/m 3 ) that describes the time integral of the heat source term Q is introduced below: = (3) According to "phase field method" validated by Calvet et al [6] and the formula derivation by D.Verdier et al [7], the equation below can be used:…”

Section: Modelingmentioning

confidence: 99%

“…To simplify the computation of the model, the parameter β, which represents the synthesis of many parameters, is kept constant with the average value 0.0001K −1 s −1 [7]. Some Parameter Values for Simulation.…”

Section: Modelingmentioning

confidence: 99%

Geometry optimization of a latent heat thermal energy storage unit using RT27

Shen¹,

Neveu²,

Shu³

et al. 2016

Proceedings of the 2016 5th International Conference on Environment, Materials, Chemistry and Power Electronics

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Abstract. Geometry optimization of a latent heat thermal energy storage (TES) unit using RT27 is investigated to figure out an optimal shape which obtains the best heat transfer property. A 2D model of the TES unit is built for numerical analysis and simulation. By applying constructal method for calculation, the optimal shape factor is around 0.15. And 11 configurations are selected for comsol simulation, aiming at validating the constructal optimization procedure and analyzing the heat transfer process. According to the data analysis of the liquid fraction and heat flux from simulation results, the optimal shape factor is also around 0.15. In addition, it's found that boundary effect makes a big difference on the heat transfer process and the existence of the optimal shape factor can be validated in theory.

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“…Among various PCM powder evaluated in their study, it was revealed that erythritol is the most promising. Verdier et al [11] experimentally investigated the PCM thermal energy storage to Hybrid Solar Gas Turbine (HSGT) systems for smoothing of temperature variation. In their study, the main goal is to keep the outlet air temperature from the collector above 650 C.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of phase change materials thermal capacitor for pipe flow

Kurnia

Sasmito

2017

MATEC Web Conf.

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Abstract. This study addresses the performance of phase change material as thermal capacitor. A computational fluid dynamics (CFD) model is developed to take into account the conjugate heat transfer between water as the heat transfer fluid (HTF) and PCM as thermal capacitor. A pulsating inlet temperature with constant inlet velocity is prescribed to represent temperature variation. The performance of thermal capacitor is evaluated by closely monitoring outlet temperature and comparing it with inlet temperature to examine the reduction in temperature fluctuation. To intensify heat transfer between HTF and PCM, extended surfaces (fins) are installed on PCM side. The results indicate that PCM thermal capacitor can reduce temperature fluctuation by ~ 1 C. This reduction can be improved further when extended surface is installed with ~ 1.5 C reduction in temperature fluctuation is achieved. Moreover, it is found that the maximum temperature is delayed at the outlet due to slow conjugate heat transfer between HTF and PCM. Inlet velocity is found to have considerable influence of the temperature fluctuation reduction: Slower inlet velocity results in a better temperature fluctuation reduction. This study is expected to serve as a guideline in designing PCM-based thermal capacitor.

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Experimentation of a High Temperature Thermal Energy Storage Prototype Using Phase Change Materials for the Thermal Protection of a Pressurized Air Solar Receiver

Cited by 21 publications

References 6 publications

Numerical study of melting process of a high-temperature phase change material including natural convection and turbulence

Numerical study of melting process of a high-temperature phase change material including natural convection and turbulence

Geometry optimization of a latent heat thermal energy storage unit using RT27

Numerical investigation of phase change materials thermal capacitor for pipe flow

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