A detailed review on heat transfer rate, supercooling, thermal stability and reliability of nanoparticle dispersed organic phase change material for low-temperature applications

Jebasingh, B. Eanest; Arasu, A. Valan

doi:10.1016/j.mtener.2020.100408

Cited by 50 publications

(27 citation statements)

References 118 publications

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Section: Resultsmentioning

confidence: 99%

“…The values of the phase-change temperature and latent heat are comparable to those in the literature, except for the solidifying temperature. The reason may be due to the randomness of supercoiling [24]. and no other new peaks were observed, indicating that inositol was physically encapsulated by SiO2, and there was no chemical reaction between the inositol core and the SiO2 shell of the nanocapsules.…”

Section: Phase-change Properties Of the Nanocapsulesmentioning

confidence: 99%

“…The values of the phase−change temperature and latent heat are comparable to those in the literature, except for the solidifying temperature. The reason may be due to the randomness of supercoiling [24]. The decrease in the solidifying temperature is attributed to the increased seed deactivation with decreased sample size [25].…”

Section: Phase−change Properties Of the Nanocapsulesmentioning

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: Resultsmentioning

confidence: 99%

Section: Phase-change Properties Of the Nanocapsulesmentioning

confidence: 99%

Section: Phase−change Properties Of the Nanocapsulesmentioning

confidence: 99%

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Synthesis and Properties of Inositol Nanocapsules

Shan

et al. 2021

Materials

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“…The type and thickness of insulation material directly bear on the energy-saving effect and economic benefit. Hence, outer wall insulation is an important measure for building energy-saving [22][23][24][25][26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Appropriateness Evaluation of Energy Saving Techniques for External Envelope of Residential Buildings Based on Value Engineering Theory

Shen¹,

Shen²

2021

IJHT

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Appropriate technology aims to achieve the optimal comprehensive benefits. The improvement of comprehensive benefits depends on the betterment of every benefit and the overall balance between benefits. Through value engineering evaluation, this paper transforms qualitative method into a quantitative method, and uses the new method to compare the comprehensive benefits of technical schemes for energy saving of external envelope of residential buildings, laying the basis for improving technical schemes. Multiple functional indices were determined, and organized into a hierarchical structure. The relative weight of each index was calculated through analytic hierarchy process (AHP). Drawing on the principle of value engineering, function coefficient, cost coefficient, and value coefficient were calculated for examples, and subjected to empirical comparison and analysis. After that, the technical schemes were contrasted, analyzed, and improved, according to the numerical value of the value coefficient. The proposed evaluation system provides a theoretical guide for making investment decisions on energy-saving residential buildings, and avoiding blind investment.

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“…They concluded that using long fins could improve the melting time. The advantage and properties of NePCM have been further investigated in [ 37 , 38 ].…”

Section: Introductionmentioning

confidence: 99%

Melting phase change heat transfer in a quasi-petal tube thermal energy storage unit

et al. 2021

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In the present study, the thermal energy storage of a hot petal tube inside a shell-tube type Thermal Energy Storage (TES) unit was addressed. The shell is filled with the capric acid Phase Change Material (PCM) and absorbs the heat from a hot U-tube petal. The governing equations for the natural convection flow of molten PCM and phase change heat transfer were introduced by using the enthalpy-porosity approach. An automatic adaptive mesh scheme was used to track the melting interface. The accuracy and convergence of numerical computations were also controlled by a free step Backward Differentiation Formula. The modeling results were compared with previous experimental data. It was found that the present adaptive mesh approach can adequately the melting heat transfer, and an excellent agreement was found with available literature. The effect of geometrical designs of the petal tube was investigated on the melting response of the thermal energy storage unit. The phase change behavior was analyzed by using temperature distribution contours. The results showed that petal tubes could notably increase the melting rate in the TES unit compared to a typical circular tube. Besides, the more the petal numbers, the better the heat transfer. Using a petal tube could increase the charging power by 44% compared to a circular tube. The placement angle of the tubes is another important design factor which should be selected carefully. For instance, vertical placement of tubes could improve the charging power by 300% compared to a case with the tubes’ horizontal placement.

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A detailed review on heat transfer rate, supercooling, thermal stability and reliability of nanoparticle dispersed organic phase change material for low-temperature applications

Cited by 50 publications

References 118 publications

Synthesis and Properties of Inositol Nanocapsules

Synthesis and Properties of Inositol Nanocapsules

Appropriateness Evaluation of Energy Saving Techniques for External Envelope of Residential Buildings Based on Value Engineering Theory

Melting phase change heat transfer in a quasi-petal tube thermal energy storage unit

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