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Open AccessArticle

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

1
Bordeaux INP, CNRS, I2M Bordeaux, ENSCBP, 16 avenue Pey Berland, 33607 Pessac CEDEX, France
2
CIC EnergiGUNE, Parque Tecnológico de Álava, Albert Einstein, 48. Edificio CIC, 01510 Miñano, Álava, Spain
3
Université de Bordeaux, CNRS, I2M Bordeaux, Esplanade des Arts et Métiers, F-33405 Talence CEDEX, France
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(2), 267; https://doi.org/10.3390/app9020267
Received: 21 December 2018 / Revised: 8 January 2019 / Accepted: 11 January 2019 / Published: 14 January 2019
(This article belongs to the Special Issue Clean Energy and Fuel (Hydrogen) Storage)
Bio-based glass-forming materials are now considered for thermal energy storage in building applications. Among them, Xylitol appears as a biosourced seasonal thermal energy storage material with high potential. It has a high energy density and a high and stable undercooling, thus allowing storing solar energy at ambient temperature and reducing thermal losses and the risk of spontaneous nucleation (i.e., the risk of losing the stored energy). Generally when the energy is needed, the discharge triggering of the storage system is very difficult as well as reaching a sufficient power delivery. Both are indeed the main obstacles for the use of pure Xylitol in seasonal energy storage. Different techniques have been hence considered to crystallize highly undercooled Xylitol. Nucleation triggering of highly undercooled pure Xylitol by using an air lift reactor has been proven here. This method should allow reaching performances matching with building applications (i.e., at medium temperatures, below 100 °C). The advantages of this technique compared to other existing techniques to activate the crystallization are discussed. The mechanisms triggering the nucleation are investigated. The air bubble generation, transportation of nucleation sites and subsequent crystallization are discussed to improve the air injection operating conditions. View Full-Text
Keywords: energy discharge; bubbles burst; bubbles transportation; crystal growth rates; undercooling energy discharge; bubbles burst; bubbles transportation; crystal growth rates; undercooling
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MDPI and ACS Style

Duquesne, M.; Palomo Del Barrio, E.; Godin, A. Nucleation Triggering of Highly Undercooled Xylitol Using an Air Lift Reactor for Seasonal Thermal Energy Storage. Appl. Sci. 2019, 9, 267.

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