Nucleation Triggering of Highly Undercooled Xylitol Using an Air Lift Reactor for Seasonal Thermal Energy Storage

Duquesne, Marie; Barrio, Elena Palomo del; Godin, Alexandre

doi:10.3390/app9020267

Cited by 22 publications

(20 citation statements)

References 22 publications

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“…This storage concept has been demonstrated for a solar heating system [12,13] and showed potential for compact thermal energy storage systems in buildings [14]. Recently, Duquesne et al reported Xylitol [15] and Puupponen et al reported micro-structured polyol-polystyrene composites [16] as further promising materials with stable supercooling properties. To investigate the stability of PCM with stable supercooling (type B tests), dedicated test procedures are required.…”

Section: Introductionmentioning

confidence: 99%

Experimental Devices to Investigate the Long-Term Stability of Phase Change Materials under Application Conditions

et al. 2020

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An important prerequisite to select a reliable phase change material (PCM) for thermal energy storage applications is to test it under application conditions. In the case of solid–liquid PCM, a large amount of thermal energy can be stored and released in a small temperature range around the solid–liquid phase transition. Therefore, to test the long-term stability of solid–liquid PCM, they are subjected to melting and solidification processes taking into account the conditions of the intended application. In this work, 18 experimental devices to investigate the long-term stability of PCM are presented. The experiments can be divided into thermal cycling stability tests, tests on PCM with stable supercooling, and tests on the stability of phase change slurries (PCS). In addition to these experiments, appropriate methods to investigate a possible degradation of the PCM are introduced. Considering the diversity of the investigated devices and the wide range of experimental parameters, further work toward a standardization of PCM stability testing is recommended.

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Section: Introductionmentioning

confidence: 99%

Experimental Devices to Investigate the Long-Term Stability of Phase Change Materials under Application Conditions

et al. 2020

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“…The crystallization occurred at the surface of the small drops generated at the liquid surface, when the primitive bubbles exploded into daughter bubbles. Duquesne et al [9] observed that mechanical agitation of a 400 ml xylitol sample contained in a glass beaker started to nucleate in only 5 s of mixing throughout the agitated region with an undercooling of 45ºC.…”

Section: Introductionmentioning

confidence: 99%

Triggering and acceleration of xylitol crystallization by seeding and shearing: Rheo-optical and rheological investigation

Delgado

Navarro

Lázaro

et al. 2021

Solar Energy Materials and Solar Cells

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The present study investigates the triggering and acceleration of xylitol crystallization for its use as a short-term TES. The combined effect of seeding and the action of shear on xylitol crystallization at a supercooled temperature has been investigated by direct observations under shear (rheo-optical approach) and by rheometry. The initial seed is an agglomerate of crystals of xylitol. In addition to the more classical erosion and rupture mechanisms leading to the dispersion of crystals, shear has shown to induce the detachment of crystalline dust adhered to the initial seed into the supercooled xylitol. These crystal fragments then serve as sites for secondary nucleation and subsequent crystallization. Rheo-optical observations have allowed the determination of shear conditions to control the size of crystals by dispersion. A second part has been dedicated to the effect of shear on crystallization of xylitol by seeding by means of rheology. The measurements, although not reproducible, clearly show that seeding in presence of shear (for the investigated conditions) is very efficient to trigger and accelerate the crystallization of xylitol. Post-mortem DSC and XRPD analyses of the final crystallized seeded and sheared samples have not shown any effect on the xylitol crystallinity degree.

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“…Additionally, when crystallization takes place, it usually happens at low rates, which limits the discharging power obtained. To overcome such issues, different methods to crystallize polyols from their melt have been studied during the last years: seeding, mechanical stirring, local cooling, additives, and ultrasound-assisted crystallization [ 6 , 7 ]. However, those that have only local effects make them inefficient to counterbalance the slow crystal growth of many polyols.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigations on Electric-Field-Induced Crystallization in Erythritol

et al. 2021

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The objective of this experimental study was to develop a method to induce crystallization of sugar alcohols using an electric field for its future implementation in latent heat thermal energy storage systems. To better understand the mechanisms behind this approach, the first step of this work was dedicated to the replication, continuation, and consolidation of promising results on erythritol reported by another research group. In the second step, a second experimental configuration, previously used to electrically control the supercooling of other phase change materials, was tested with the same sugar alcohol. For both configurations, the influence of the type of current (DC and AC at different frequencies), its amplitude, and time of exposure were studied. However, none of these tests allowed influencing the crystallization of erythritol. Even if surprising at first glance, the difficulty in reproducing experiments and interpreting the results is not new in the field of electric-field-induced crystallization, as shown in particular by the abundant literature reviews concerning water. Currently, to the best of our knowledge, we consider that electric fields could be an attractive option to initiate and accelerate the crystallization of erythritol, but this solution must be considered with caution.

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Nucleation Triggering of Highly Undercooled Xylitol Using an Air Lift Reactor for Seasonal Thermal Energy Storage

Cited by 22 publications

References 22 publications

Experimental Devices to Investigate the Long-Term Stability of Phase Change Materials under Application Conditions

Experimental Devices to Investigate the Long-Term Stability of Phase Change Materials under Application Conditions

Triggering and acceleration of xylitol crystallization by seeding and shearing: Rheo-optical and rheological investigation

Experimental Investigations on Electric-Field-Induced Crystallization in Erythritol

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