Effect of nanoparticle dispersion on specific heat capacity of a binary nitrate salt eutectic for concentrated solar power applications

Dudda, Bharath; Shin, Donghyun

doi:10.1016/j.ijthermalsci.2013.02.003

Cited by 205 publications

(95 citation statements)

References 16 publications

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“…Chieruzzi et al enhanced the specific heat of a binary nitrate (NaNO 3 -KNO 3 ) by dispersing various nanoparticles (Al 2 O 3 , SiO 2 , TiO 2 , and SiO 2 -Al 2 O 3 ) [23,24]. The enhanced specific heat of the molten salt nanofluids was explained in various ways, e.g., electron microscope images and molecular dynamics simulation [25][26][27][28][29][30]. Furthermore, a fundamental experimental study into thermal property variations of carbonate salt mixtures was performed using a differential scanning calorimeter (DSC) [31].…”

Section: Introductionmentioning

confidence: 99%

Anomalous Increase in Specific Heat of Binary Molten Salt-Based Graphite Nanofluids for Thermal Energy Storage

Kim¹,

Jo²

2018

Applied Sciences

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An anomalous increase of the specific heat was experimentally observed in molten salt nanofluids using a differential scanning calorimeter. Binary carbonate molten salt mixtures were used as a base fluid, and the base salts were doped with graphite nanoparticles. Specific heat measurements of the nanofluids were performed to examine the effects of the composition of two salts consisting of the base fluid. In addition, the effect of the nanoparticle concentration was investigated as the concentration of the graphite nanoparticles was varied from 0.025 to 1.0 wt %. Moreover, the dispersion homogeneity of the nanoparticles was explored by increasing amount of surfactant in the synthesis process of the molten salt nanofluids. The results showed that the specific heat of the nanofluid was enhanced by more than 30% in the liquid phase and by more than 36% in the solid phase at a nanoparticle concentration of 1 wt %. It was also observed that the concentration and the dispersion homogeneity of nanoparticles favorably affected the specific heat enhancement of the molten salt nanofluids. The dispersion status of graphite nanoparticles into the salt mixtures was visualized via scanning electron microscopy. The experimental results were explained according to the nanoparticle-induced compressed liquid layer structure of the molten salts.

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Section: Introductionmentioning

confidence: 99%

Anomalous Increase in Specific Heat of Binary Molten Salt-Based Graphite Nanofluids for Thermal Energy Storage

Kim¹,

Jo²

2018

Applied Sciences

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“…It was shown that the stored heat of molten salts as NaNO 3 -KNO 3 [22] and KNO 3 [23] is increased with the addition of 1.0 wt.% of SiO 2 -Al 2 O 3 and SiO 2 . Mixing of nanoparticles and the salt mixture at high temperature in a twin screw microcompounder [21].…”

Section: Heat Storage Materialsmentioning

confidence: 99%

Heat Exchange Analysis on Latent Heat Thermal Energy Storage Systems Using Molten Salts and Nanoparticles as Phase Change Materials

Miliozzi¹,

Liberatore²,

Nicolini³

et al. 2018

Advancements in Energy Storage Technologies

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The increase of carbon dioxide emissions is the most important contributor to climate change. A better use of produced energy, increasing systems efficiency and using renewable sources, can limit them. A key technological issue is to integrate a thermal energy storage (TES). It consists in stocking thermal energy through the heating/cooling of a storage material for future needs. Among various technologies, latent heat TES (LHTES) provides high energy storage density at constant temperature during melting/solidification of storage media. The bottleneck in the use of typical PCMs is their low thermal conductivity. To improve the heat exchange between heat transfer fluid and PCM, three methods are possible and here experimentally analyzed: conductivity systems enhancements; convective flows promotion in liquid phase; and improvement of PCM thermal properties including small amounts of nanoparticles. CFD models were used to evaluate physical phenomena that are crucial for optimized LHTES systems design. The study of the heat exchange mode allowed some useful indications to achieve an optimized LHTES, taking advantage by convective flows and conductivity promotion systems. The use of NEPCM, to maximize the stored energy density and realize compact systems, makes necessary the improvement of its thermal diffusivity. These will be the future research topics.

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“…Shin and Banerjee [15] reported anomalous enhancement of specific heat (14.5% increase) of SiO 2 /chloride nanofluid prepared from barium chloride, sodium chloride, calcium chloride and lithium chloride along with silicon dioxide. Dudda and Shin [16] studied the specific heat capacity using DSC for four different nanomaterials containing binary nitrate salt (NaNO 3 and KNO 3 ) and found that the specific heat capacity was enhanced with an increase in the nanoparticle size. The results obtained in this study are significant and have shown an increase in the specific heat capacity of the green-synthesised nanofluids containing AuNP.…”

Section: Thermal Properties Of Nanofluidsmentioning

confidence: 99%

Gold nanofluids synthesised using antioxidant catechin, its characterisation and studies on nucleation

Krishnaswamy

Orsat

2015

Journal of Experimental Nanoscience

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Nanofluids are a new class of fluids where nanosized solid particles are dispersed in a liquid medium. This study aims to experimentally investigate the production of gold nanofluids using catechin (CAT), a polyphenolic compound. The characterisation of the green-synthesised nanoparticles using UVÀvisible spectrophotometer, differential scanning calorimeter, dielectric spectroscopy, and transmission electron microscopy, attempts to generate information to understand the properties of greensynthesised gold nanofluids. Four nanofluids were prepared by varying their concentrations between CAT and tannic acid to form gold nanoparticles (AuNP) in water. The gold nanofluids exhibited interesting thermal, surface plasmon resonance, and dielectric properties. The formation of the AuNP was studied using two different methods using transmission electron microscope and they exhibited interesting growth patterns within 1 minute. These results are significant as they shed light on the importance of the onset of the AuNP formation.

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Effect of nanoparticle dispersion on specific heat capacity of a binary nitrate salt eutectic for concentrated solar power applications

Cited by 205 publications

References 16 publications

Anomalous Increase in Specific Heat of Binary Molten Salt-Based Graphite Nanofluids for Thermal Energy Storage

Anomalous Increase in Specific Heat of Binary Molten Salt-Based Graphite Nanofluids for Thermal Energy Storage

Heat Exchange Analysis on Latent Heat Thermal Energy Storage Systems Using Molten Salts and Nanoparticles as Phase Change Materials

Gold nanofluids synthesised using antioxidant catechin, its characterisation and studies on nucleation

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