An investigation of thermal characteristics of eutectic molten salt-based nanofluids

Ercole, Davide; Manca, Oronzio; Vafai, Kambiz

doi:10.1016/j.icheatmasstransfer.2017.06.022

Cited by 41 publications

(20 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the last decade, many experimental studies have reported enhancements in the specific heat of molten salts, which consist of more than two salt components in most of the studies. In general, carbonate-salt-based nanofluids exhibit a favorable specific heat enhancement regardless of the nanoparticles and the base solvent salts (as summarized by Ercole et al 31 and Razi et al 32 ). However, inconsistent results have been observed when using binary nitrate salt mixtures (NaNO 3 and KNO 3 ) as base solvents.…”

Section: Discussionmentioning

confidence: 99%

“…However, inconsistent results have been observed when using binary nitrate salt mixtures (NaNO 3 and KNO 3 ) as base solvents. Some of the studies reported an increase in the specific heat, but some observed a decrease 31,32 . In addition, the type of nanoparticle is also a significant factor affecting the specific heat of nitrate salt mixtures.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Thermal energy storage characteristics of binary molten salt nanofluids: Specific heat and latent heat

Lee

2020

Int J Energy Res

View full text Add to dashboard Cite

Summary This study aims to examine the thermal energy storage characteristics, in terms of specific heat and latent heat, of nanoparticle‐doped binary molten salt nanofluids. Two different binary molten salt mixtures, namely carbonate salts (Li2CO3 and K2CO3) and nitrate salts (NaNO3 and KNO3), were used as base solvents. Graphite nanoparticles were dispersed into the salt mixtures. The chemical compositions (molar fractions) of the two salt components were varied from hypoeutectic to hypereutectic, including eutectic compositions, to investigate their effects on the specific heat and latent heat of both the pure salts and their nanofluids. The specific heat of the carbonate salt nanofluid was enhanced, irrespective of the chemical composition, and the enhancement was proportional to the nanoparticle concentration. However, the specific heat of the nitrate salt nanofluid was decreased by the addition of 0.1 wt% of graphite nanoparticles and increased by the addition of a larger amount of 1 wt%. The latent heat of the nanofluids was enhanced by doping nanoparticles into the salt mixtures and was affected by the chemical composition of the solvent salt mixtures. The distinct behaviors of specific heat and latent heat obtained in this study were discussed based on a compressed liquid (solid‐like) layer formed near the nanoparticles. The thermal energy storage capacities of the nanofluids were estimated and compared by using their specific heat and latent heat.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Thermal energy storage characteristics of binary molten salt nanofluids: Specific heat and latent heat

Lee

2020

Int J Energy Res

View full text Add to dashboard Cite

show abstract

“…For aqueous solvents, the specific heat capacity has been reported to decrease with an increasing concentration of nanoparticles [ 20 , 21 , 22 , 23 ]:

where

is the mass fraction, c p is the specific heat capacity value, and the subscripts nf , np and f stand for nanofluid, nanoparticle and base fluid. On the other hand, an increasing number of studies have reported a radical enhancement in the specific heat capacity of non-aqueous solvent and in particular molten salt [ 24 , 25 , 26 , 27 , 28 , 29 , 30 ]. For example, the early study by Shin and Banerjee reported an enhancement up to 24% in the specific heat capacity of molten salt eutectic containing 1% SiO 2 nanoparticles [ 31 , 32 ].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Molten Salt Nanofluids for Thermal Energy Storage Application in Concentrated Solar Power Plants—Mechanistic Understanding of Specific Heat Capacity Enhancement

Shin

Banerjee

2020

Nanomaterials

View full text Add to dashboard Cite

Molten salts mixed with nanoparticles have been shown as a promising candidate as the thermal energy storage (TES) material in concentrated solar power (CSP) plants. However, the conventional method used to prepare molten salt nanofluid suffers from a high material cost, intensive energy use, and laborious process. In this study, solar salt-Al2O3 nanofluids at three different concentrations are prepared by a one-step method in which the oxide nanoparticles are generated in the salt melt directly from precursors. The morphologies of the obtained nanomaterials are examined under scanning electron microscopy and the specific heat capacities are measured using the temperature history (T-history) method. A non-linear enhancement in the specific heat capacity of molten salt nanofluid is observed from the thermal characterization at a nanoparticle mass concentration of 0.5%, 1.0%, and 1.5%. In particular, a maximum enhancement of 38.7% in specific heat is found for the nanofluid sample prepared with a target nanoparticle mass fraction of 1.0%. Such an enhancement trend is attributed to the formation of secondary nanostructure between the alumina nanoparticles in the molten salt matrix following a locally-dispersed-parcel pattern. These findings provide new insights to understanding the enhanced energy storage capacity of molten salt nanofluids.

show abstract

“…Chieruzzi et al [8] have experimentally investigated a PCM with nanoparticles concluding that the latent heat of the Nano-PCM has increased of 12%. Ercole et al [9] have found a robust correlation of the specific heat varying of temperature, nanoparticles diameters and volume concentration for PCM molten salt with Silica nanoparticles using experimental data in literature. Bayat et al [10] numerically simulated the performance of a finned heat sink with phase change material with nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on Nano-PCM in aluminum foam in latent thermal energy storages

Buonomo¹,

Ercole²,

Manca³

et al. 2018

MMC_B

Self Cite

View full text Add to dashboard Cite

Thermal storage system (TES) with phase change material (PCM) is an important device to store thermal energy. It works such a thermal buffer to reconcile the supply energy with the energy demand. It has a wide application field especially for solar thermal energy storage. The main drawback is the low value of thermal conductivity of the PCM making the system useless for the thermal engineering applications. A way to resolve this problem is to combine the PCM with a highly conductive material like metal foam and/or nanoparticles. In this paper a numerical investigation on the metal foam effects into the latent heat thermal energy storage system, based on a phase change material with nanoparticles (Nano-PCM), is accomplished. The modelled TES is a typical 70L water tank filled up with Nano-PCM with pipes to transfer thermal energy from a fluid to the Nano-PCM. The PCM is a pure paraffin wax and the nanoparticles are in aluminum oxide. The metal foam is made of aluminum with assigned values of porosity. The enthalpyporosity theory is employed to simulate the phase change of the Nano-PCM and the metal foam is modelled as a porous media. Numerical simulations are carried out using the Ansys-Fluent code. The results are shown in term of melting time, temperature at varying of time and total amount of stored energy. Keywords:thermal energy storage, Nano-PCM, foams Ren et al. [17] have numerically investigate the melting process of the PCM of a TES system with nanoparticles and Modelling, Measurement and Control B

show abstract

An investigation of thermal characteristics of eutectic molten salt-based nanofluids

Cited by 41 publications

References 26 publications

Thermal energy storage characteristics of binary molten salt nanofluids: Specific heat and latent heat

Thermal energy storage characteristics of binary molten salt nanofluids: Specific heat and latent heat

Synthesis and Characterization of Molten Salt Nanofluids for Thermal Energy Storage Application in Concentrated Solar Power Plants—Mechanistic Understanding of Specific Heat Capacity Enhancement

Numerical investigation on Nano-PCM in aluminum foam in latent thermal energy storages

Contact Info

Product

Resources

About