Effect of nanoparticles on heat capacity of nanofluids based on molten salts as PCM for thermal energy storage

Chieruzzi, Manila; Cerritelli, Gian F.; Miliozzi, Adio; Kenny, J. M.

doi:10.1186/1556-276x-8-448

Cited by 317 publications

(144 citation statements)

References 53 publications

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“…to the DSC measurements and the SEM images, it may be concluded that the homogeneous dispersion of the nanoparticles favorably influences the specific heat enhancement of the nanofluids. Regarding the enhanced specific heat of molten salt nanofluids, the higher heat capacity of the nanoparticles, the interfacial thermal resistance at the solid-liquid interface, and the formation of the compressed liquid layer near the nanoparticles were proposed as mechanisms contributing to the increase of the specific heat [19,23,45].…”

Section: Resultsmentioning

confidence: 99%

“…Needleshaped structures and network-like structures are often shown in research papers concerning the specific heat of molten salt nanofluids [23,45]. It is reasonable to consider that the special structures are relevant to the specific heat increase.…”

Section: Resultsmentioning

confidence: 99%

“…have been performed to identify the mechanism underlying the specific heat increase in the molten salt nanofluids [18][19][20][21][22]. 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].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…About the latent heat enhancement, there is lack of information. However, some studies performed by University of Perugia reported an increase of 15% mainly with silica-alumina nanoparticles in nitrate mixture [22] and also in KNO 3 as molten salt having a melting point of 334°C (the latent heat increased by 12%). In both studies, the NEPCMs were produced in water solution [23].…”

Section: Heat Storage Materialsmentioning

confidence: 98%

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

Self Cite

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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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“…Therefore, thermal engineering is needed in process of mixing nanoparticles into PCM without reducing heat capacity of PCM. Mixing nanoparticle with PCM has been conducted by many researchers to increase latent heat [8,9] and heat capacity [10].…”

Section: Introductionmentioning

confidence: 99%

New method of thermal cycling stability test of phase change material

et al. 2017

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Abstract. Phase Change Material (PCM) is the most promising material as thermal energy storage nowadays. As thermal energy storage, examination on endurance of material for long-term use is necessary to be carried out. Therefore, thermal cycling test is performed to ensure thermal stability of PCM. This study have found a new method on thermal cycling test of PCM sample by using thermoelectric as heating and cooling element. RT 22 HC was used as PCM sample on this thermal cycling test. The new method had many advantages compared to some references of the same test. It just needed a small container for PCM sample. The thermoelectric could release heat to PCM sample and absorb heat from PCM sample uniformly, respectively, was called as heating and cooling process. Hence, thermoelectric had to be supported by a relay control device to change its polarity so it could heat and cool PCM sample alternately and automatically. On the other hand, the thermoelectric was cheap, easy to be found and available in markets. It can be concluded that new method of thermal cycling test by using thermoelectric as source of heating and cooling can be a new reference for performing thermal cycling test on PCM.

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Effect of nanoparticles on heat capacity of nanofluids based on molten salts as PCM for thermal energy storage

Cited by 317 publications

References 53 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

New method of thermal cycling stability test of phase change material

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