Screening of sugar alcohols and their binary eutectic mixtures as phase change materials for low-to-medium temperature latent heat storage. (Ⅰ): Non-isothermal melting and crystallization behaviors

Shao, Xuefeng; Wang, Chao; Yang, Yongjian; Feng, Biao; Zhu, Zhengwu; Wang, Wujun; Zeng, Yi; Fan, Li‐Wu

doi:10.1016/j.energy.2018.07.081

Cited by 77 publications

(62 citation statements)

References 45 publications

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“…The difference between the melting temperature, solidifying temperature, latent heat of melting and solidifying of the inositol obtained in the present study and those reported in the literature is 0.4 °C, 10 °C, 0.9 kJ/kg and 0.6 kJ/kg, respectively. As a result, the supercooling degree, which is defined as Δ T = T m − T s , exhibited a difference of 9.6 °C between the present result and that in the literature [ 21 ]. The values of the phase-change temperature and latent heat are comparable to those in the literature, except for the solidifying temperature.…”

Section: Resultscontrasting

confidence: 70%

“…Although the limited studies demonstrate the possibility of encapsulation of sugar alcohols, to the best of our knowledge, no study has been reported on the synthesis of inositol MPCMs/NPCMs. Inositol has a high latent heat of 224.5 kJ/kg and a melting temperature of 261.8 °C [ 21 ], which makes a promising PCM for various medium temperature applications such as solar thermal energy storage. Moreover, synthesis conditions have great impacts on the phase-change performance of MPCMs/NPCMs.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Properties of Inositol Nanocapsules

Shan

et al. 2021

Materials

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Sugar alcohols are phase−change materials with various advantages but may suffer from leakage during applications. In this study, inositol nanocapsules were synthesized at various conditions, including the amount of precursors and the time for adding the precursors. The effects of synthesis conditions on the properties of the nanocapsules were studied. The morphology, chemical composition, microstructure, phase−change characteristics and size distribution of the nanocapsules were investigated by scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FT−IR), transmission electron microscope (TEM), differential scanning calorimeter (DSC) and a zeta potential analyzer. The results confirm that inositol was well−encapsulated by an SiO2 shell. The shell thickness increased, while the supercooling degree of the nanocapsules decreased with increasing time for adding the precursors. In order to obtain nanocapsules with good morphology and phase−change characteristics, the time for adding the precursors should increase with the amount of precursors. The nanocapsules with the best properties exhibited high melting enthalpy, encapsulation ratio and energy storage efficiency of 216.0 kJ/kg, 83.1% and 82.1%, respectively. The size of the nanocapsules was remarkably affected by the triethoxysilane (TES) amount.

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Section: Resultscontrasting

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Synthesis and Properties of Inositol Nanocapsules

Shan

et al. 2021

Materials

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“…This aspect is due to the fact that there was no liquid-solid transition in the cooling phase of the previous cycle. The same results were also obtained by other authors during the cooling phase of the DSC measurements [19,23,24,38,45]. In particular, Shao et al [19] carried out three consecutive tests and showed that no endothermic peaks were detected in the heating phase of the second and third tests.…”

Section: Thermodynamic and Transport Properties Of Xylitolsupporting

confidence: 82%

“…It is important to note that SAs can show the phenomenon of supercooling, that is, the latent heat stored in the liquid PCM is released during solidification at a temperature that is lower than the melting point. The supercooling degree of SAs, that is, the difference between the melting and crystallization temperatures, can be more or less severe [18][19][20] and is influenced by many factors such as the volume size of the sample, the presence of impurities, the container characteristics, and the cooling conditions [21,22]. Supercooling is usually considered a drawback, since it prevents the use of SAs as short-term TESs in different applications [18].…”

Section: Introductionmentioning

confidence: 99%

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Experimental Analysis of Nucleation Triggering in a Thermal Energy Storage Based on Xylitol Used in a Portable Solar Box Cooker

et al. 2021

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Sugar alcohols have interesting thermodynamic properties that make them good options as heat storage materials (HSMs) to be used in solar cookers. Among sugar alcohols, xylitol is affected by severe supercooling that can significantly alter its usefulness in thermal energy storage (TES) systems. To overcome the supercooling issue, in this work the thermal behavior of a xylitol-based TES installed in a portable solar box cooker was investigated experimentally. The solar cooker has a 4.08 concentration ratio and the TES is a double-pot system filled with 2.5 kg of commercial-grade xylitol. The TES includes a manual mixing device that can be used to trigger the nucleation of xylitol. The effectiveness of the TES system with and without triggering was assessed through several outdoor tests, divided into heating and cooling phases, using silicone oil as absorbing media. It was found that the average load cooling time, in the temperature range of the test fluid from 110 to 80∘C, increased by about 346% when the solar cooker was equipped with the xylitol-triggered TES. The mixing device can therefore be considered an effective solution for regarding xylitol as an actual and performing phase change material.

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Long‐Term Infrared Stealth by Sandwich‐Like Phase‐Change Composites at Elevated Temperatures via Synergistic Emissivity and Thermal Regulation

Jing,

Liu,

Wang

2023

Adv Funct Materials

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The rapid development of infrared surveillance technologies has attracted great attention for scientists to design advanced functional materials with prominent infrared stealth and thermal camouflage effectiveness. In the current study, a sandwich‐like functional composite based on a crosslinked polyimide aerogel, a meso‐erythritol (mE)‐based phase‐change composite, and an MXene film has been developed to achieve long‐term thermal camouflage at elevated temperatures. In this composite system, the lower aerogel layer can act as a barrier to insulate heat transfer through its layer‐stacking structure under ultralow directional thermal conduction. The introduction of the middle phase‐change composite layer ensures that the composite system obtains a dynamical temperature‐regulation capability through sensible and latent heat absorption of mE as a phase change material, while the upper MXene layer provides a very low emissivity surface for the system. As a result, the developed composite achieves a significant reduction in the thermal radiation temperature of a high‐temperature target. Moreover, the MXene film exhibits good electromagnetic interference shielding effectiveness, making the sandwich‐like composite obtain a thermal camouflage capability in various complicated scenarios. This work provides a promising approach for the design of advanced functional materials to realize long‐term infrared stealth and thermal camouflage of high‐temperature targets in security protection and counter‐surveillance.

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Screening of sugar alcohols and their binary eutectic mixtures as phase change materials for low-to-medium temperature latent heat storage. (Ⅰ): Non-isothermal melting and crystallization behaviors

Cited by 77 publications

References 45 publications

Synthesis and Properties of Inositol Nanocapsules

Synthesis and Properties of Inositol Nanocapsules

Experimental Analysis of Nucleation Triggering in a Thermal Energy Storage Based on Xylitol Used in a Portable Solar Box Cooker

Long‐Term Infrared Stealth by Sandwich‐Like Phase‐Change Composites at Elevated Temperatures via Synergistic Emissivity and Thermal Regulation

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