Quantifying the nanoparticles concentration in nano-PCM

Venkateshwar, Kumar; Joshy, Naveen; Simha, H.; Mahmud, Shohel

doi:10.1007/s11051-019-4716-x

Cited by 26 publications

(7 citation statements)

References 17 publications

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“…The reason for this phenomenon is that the amount of the specific surface area of small nanoparticles is greater than that of large sizes and thus a greater mass of nanoparticles is included in the same volume and their mass per volume is subsequently higher. Furthermore, it has been reported in the literature that the precipitation of the nanoparticles can be efficaciously limited by using smaller sizes 33 …”

Section: Resultsmentioning

confidence: 99%

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Enhancing thermophysical properties of phase change material via alumina and copper nanoparticles

Jafarian

Gracia

Omid

et al. 2021

Intl J of Energy Research

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Summary The usage of phase change materials (PCMs) in thermal energy storage (TES) systems has been a promising approach in recent years. An accurate estimation of their thermophysical properties is a key factor in their optimal and efficient performance in TES systems. In this study, aluminum oxide (Al2O3) and copper (Cu) nanoparticles were incorporated in paraffin wax as a PCM to enhance its thermophysical properties. The effects of the nanoparticle type, mass fraction, and its size on the specific heat, density, thermal conductivity, and TES density of the nanocomposites, were investigated. A field emission scanning electron microscope (FESEM) was used to study their morphology. The experiments were based on three factors, nanoparticle type (Al2O3 and Cu), nanoparticle mass fraction (1%, 3%, and 6%), and nanoparticle size (30, 70, and 110 nm), while pure paraffin wax was applied as the control sample. The addition of nanoparticles to paraffin has been proven to be a promising technique. The results showed that the specific heat changes of the NePCMs have not been influenced by the factors under consideration. Also, higher mass fractions and smaller sizes of nanoparticles resulted in higher densities in NePCMs. Moreover, the thermal energy storage density of NePCMs increased at higher loading and smaller size of the nanoparticles. The improvement in thermal conductivity is especially significant if the smallest nanoparticle size with mass fractions of 3% and 6% is used. An improvement in thermal conductivity of up to 72% has been achieved at a mass fraction of 6% of 30 nm copper nanoparticles. Finally, the NePCM containing 6% mass fraction and 30 nm size of the nanoparticle (A6S and C6S) were selected as optimal NePCMs.

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Section: Resultsmentioning

confidence: 99%

“…Furthermore, it has been reported in the literature that the precipitation of the nanoparticles can be efficaciously limited by using smaller sizes. 33…”

Section: Densitymentioning

confidence: 99%

Enhancing thermophysical properties of phase change material via alumina and copper nanoparticles

Jafarian

Gracia

Omid

et al. 2021

Intl J of Energy Research

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“…At the same time, the dispersion effect of relatively small nanoparticles in the PCM is better, and sedimentation is does not easily occur. Venkateshwar et al 113 found through experimental research that the decrease in the size of nanoparticles increases the ratio of the surface area to volume of nanoparticles, thereby reducing the ratio of surface force to physical force. In addition, the shape of nanoparticles will also affect the ratio of surface area to volume.…”

Section: Role Of Additives and Comparativementioning

confidence: 99%

“…Therefore, it is necessary to add a large amount of nanoparticles to the material, but it will reduce the latent heat of the PCM, which limits the application of the nanoparticles, and the sedimentation of the nanoparticles may occur after multiple cycles. 122 Venkateshwar et al 113 found that the higher the initial concentration of nanoparticles, the higher the corresponding number of nanoparticles per unit, and the smaller the distance between particles, which makes nanoparticles more prone to cluster around settlement. Adsorption of nanomaterials in porous media can effectively reduce the permeability and reduce the occurrence of settlement.…”

Section: Role Of Additives and Comparativementioning

confidence: 99%

Comparative Analysis of Additives for Increasing Thermal Conductivity of Phase Change Materials: A Review

Zhang

et al. 2022

Energy Fuels

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The use of cold storage devices to store energy at low peaks of power usage and release it at peaks is an economic measure. It is also one of the main means to solve the imbalance between electricity shortages during the day and abundance at night. Adding cold storage balls equipped with phase change materials (PCMs) into water cold storage devices can utilize the sensible heat of water and the latent heat of PCMs for cold storage, which has a high energy storage density and can provide cold water with a suitable temperature. PCMs can be divided into organic phase change materials (OPCMs) and inorganic phase change materials (IPCMs), but both have defects. Adding additives or other materials to them to form composite phase change materials (CPCMs) can obtain suitable thermal properties. In the process of material application, some PCMs have problems of poor thermal conductivity (TC) and liquid leakage. The use of additives such as expanded graphite (EG), metal foam, and nanoparticles is a better solution to the above problems. In recent years, many scholars have researched PCMs and additives for increasing thermal conductivity (AITC). However, there is still a lack of detailed comparison among EG, metal foam, and nanoparticles. This article will introduce the PCMs used in the temperature zone (TZ) of cold storage air-conditioning systems (CSASs) and analyze their advantages, disadvantages, and improvement methods. This paper will focus on the latest research on the effect of additives such as nanoparticles, EG, and metal foam on the TC of PCMs. It will also compare the special effects of AITC in preventing supercooling, preventing phase separation, preventing leakage of liquid PCMs, and flame retarding. The future research directions of AITC will be discussed.

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“…Nanofluids have a high potential to replace conventional heat transfer fluids in thermal systems due to higher thermal conductivity and increased surface‐area‐to‐volume ratio of the constituent nanoparticles. Even though a significant increase in the number of published information is found regarding the use of nanofluids in convective and boiling heat transfer applications, Venkateshwar et al 3 reported that the sedimentation of nanoparticles adversely affects the application of nanofluid in heat transfer systems. Heat pipes are passive heat transfer devices that utilize phase change mechanisms for high heat flux removal.…”

Section: Introductionmentioning

confidence: 99%

Thermal performance enhancement studies using graphite nanofluid for heat transfer applications

2020

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Enhanced boiling heat transfer using nanofluids is highly relevant due to its potential applications in thermal management of systems producing large heat fluxes. However, the sedimentation of nanoparticles limits their application in heat transfer systems. So, the preparation of a stable nanofluid remains a big research challenge. The stability issues arise due to the large difference in the density of nanoparticle and the base fluid. Graphite nanoparticle is selected in this study, as it has 4.5 times lower density than copper and comparable thermal conductivity. An experimental study is conducted to evaluate the suitability of graphite nanofluid in mesh wick heat pipes, which are devices that utilize boiling and condensation principles to transfer high heat fluxes. Thermal transport properties and boiling heat transfer characteristics showed enhancement and the effect of nanofluid on the device level thermal performance is thoroughly assessed. Experimental results are compared with the published literature. A reduction in thermal resistance by 32.5% and an improvement in the heat transfer coefficient by 48.02% in comparison with base fluid clearly indicate the superiority of the graphite nanofluid for heat transfer applications.

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Quantifying the nanoparticles concentration in nano-PCM

Cited by 26 publications

References 17 publications

Enhancing thermophysical properties of phase change material via alumina and copper nanoparticles

Enhancing thermophysical properties of phase change material via alumina and copper nanoparticles

Comparative Analysis of Additives for Increasing Thermal Conductivity of Phase Change Materials: A Review

Thermal performance enhancement studies using graphite nanofluid for heat transfer applications

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