Preparation and thermophysical properties of nanoparticle-in-paraffin emulsion as phase change material

Ho, Ching-Jenq; Gao, Junkai

doi:10.1016/j.icheatmasstransfer.2009.01.015

Cited by 334 publications

(106 citation statements)

References 25 publications

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“…Therefore, the thermal properties of nano-enhanced PCMs with different sizes, geometries and volume fractions of nanometer-sized materials should be measured in order to determine the best mixture. The thermal properties of nano-enhanced PCMs can be characterized by using a wide range of techniques and some commonly used techniques [7,33,[37][38][39][40][41] are summarized in Table 1.…”

Section: Materials Thermal Characterizationmentioning

confidence: 99%

“…Paraffin has demonstrated very good storage performance in various applications and is one of the most commonly used organic PCMs [7,13,41]. A number of studies have used various nanometer-sized materials to improve the thermal conductivity of paraffin.…”

Section: Nano-enhanced Pcms With Paraffin As the Base Fluidmentioning

confidence: 99%

“…The heat conduction and differential scanning calorimeter (DSC) experiments showed that, among the four types of particles, paraffin mixed with titania provided better heat conduction and thermal storage performance. Ho and Gao [41] investigated the thermo-physical properties of paraffin with alumina nanoparticles. It was shown that the thermal conductivity and dynamic viscosity of the mixture increased nonlinearly with the increase of the mass fraction of alumina nanoparticles.…”

Section: Nano-enhanced Pcms With Paraffin As the Base Fluidmentioning

confidence: 99%

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Nano-enhanced phase change materials for improved building performance

Lin

Sohel

2016

Renewable and Sustainable Energy Reviews

148

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Nano-enhanced phase change materials (PCMs) have attracted increasing attention to address one of the key barriers (i.e. low thermal conductivity) to the wide adoption of PCMs in many industrial applications. This paper discusses the generic problem and key issues associated with appropriately using this new class of materials in buildings for effective thermal management and improved energy performance. An overview on major recent development and application of nano-enhanced PCMs as thermal energy storage media is provided. A case study based on a PCM ceiling ventilation system integrated with solar photovoltaic thermal (PVT) collectors is then performed to evaluate the potential benefits due to the dispersion of copper nanoparticles into the PCM base fluid of RT24. The results showed that this nano-enhanced PCM has higher melting and solidification rates than that of the pure PCM. Compared to the use of the pure PCM, 8.3% more heat was charged in and 25.1% more heat was discharged from the nano-enhanced PCM under the three winter test days. More research is needed to understand the fundamental mechanisms behind the PCM thermal conductivity enhancement through the dispersion of nanometer-sized materials and to investigate how these mechanisms drive building performance enhancement. Abstract: Nano-enhanced phase change materials (PCMs) have attracted increasing attention to address one of the key barriers (i.e. low thermal conductivity) to the wide adoption of PCMs in many industrial applications. This paper discusses the generic problem and key issues associated with appropriately using this new class of materials in buildings for effective thermal management and improved energy performance. An overview on major recent development and application of nano-enhanced PCMs as thermal energy storage media is provided. A case study based on a PCM ceiling ventilation system integrated with solar photovoltaic thermal (PVT) collectors is then performed to evaluate the potential benefits due to the dispersion of copper nanoparticles into the PCM base fluid of RT24. The results showed that this nano-enhanced PCM has higher melting and solidification rates than that of the pure PCM. Compared to the use of the pure PCM, 8.3% more heat was charged in and 25.1% more heat was discharged from the nano-enhanced PCM under the three winter test days. More research is needed to understand the fundamental mechanisms behind the PCM thermal conductivity enhancement through the dispersion of nanometer-sized materials and to investigate how these mechanisms drive building performance enhancement.

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Section: Materials Thermal Characterizationmentioning

confidence: 99%

Section: Nano-enhanced Pcms With Paraffin As the Base Fluidmentioning

confidence: 99%

Section: Nano-enhanced Pcms With Paraffin As the Base Fluidmentioning

confidence: 99%

See 1 more Smart Citation

Nano-enhanced phase change materials for improved building performance

Lin

Sohel

2016

Renewable and Sustainable Energy Reviews

148

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“…The result showed that the thermal conductivities of the paraffin/nickel foam and the paraffin/copper foam composites were nearly three and 15 times larger than that of pure paraffin. Metal oxide fillers have also been used to improve the thermal conductivity of paraffin PCMs, but the enhancement is not significant [10][11][12][13]. For example, Wang et al [10] dispersed Al 2 O 3 nanoparticles with mass fractions of 1-5 wt % into paraffin (Tm = 52-56 • C) to prepare the composites.…”

Section: Introductionmentioning

confidence: 99%

Synergistically-Enhanced Thermal Conductivity of Shape-Stabilized Phase Change Materials by Expanded Graphite and Carbon Nanotube

Liu

Yang

2017

Applied Sciences

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Featured Application: This work faces applications in energy-saving buildings. The involved shape-stabilized phase change material is a promising material used in walls or floors of buildings to regulating the room temperature in a comfortable range, taking advantage of clean and sustainable solar energy or off-peak electricity. Abstract:The thermal conductivity of expanded graphite plate (EGP) and/or multi-wall carbon nanotube (MWCNT)-filled, shape-stabilized, phase change material (SSPCM), based on paraffin, high-density polyethylene (HDPE), and styrene-butadiene-styrene copolymer (SBS), was investigated. The results demonstrated that both EGP and MWCNT increased the thermal conductivity of the SSPCM. EGP showed a greater thermal conductivity improvement than MWCNT. The conductivity of EGP-filled SSPCM reached 0.574 W/mK at 9 wt %, while that of MWCNT was just 0.372 W/mK at the same loading. Furthermore a series of EGP/MWCNT hybrid fillers were prepared and introduced into the SSPCM, and a synergistic effect was observed between the two fillers. When the EGP/MWCNT ratio was 8:2, the most significant thermal conductivity enhancement to the SSPCM was obtained. The thermal conductivity was 0.674 W/mK, 288% that of the SSPCM and 117% that of 9 wt % EGP-filled SSPCM. The SEM photos showed that a bridging of two-dimensional (2D) planar EGP by flexible one-dimensional (1D) MWCNT was constructed. The so-formed EGP-MWCNT network favored heat transfer along it and led to a decreased thermal interface resistance due to the increased EGP-MWCNT junctions.

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“…Ho and Gao [4] recently examined the thermophysical characteristics of PCM, including density, dynamic viscosity, thermal conductivity, and latent heat of fusion; their results indicated that the dynamic viscosity of paraffin was enhanced by adding aluminum particles. Xiao and Zhang [5] found that the addition of aluminum particles effectively decreased the charging and discharging times on the solidification and melting of paraffin present in a solar collector.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Integrated Solar Collector with Spherical Capsules PCM Affected by Additive Aluminum Powder

Ghuol

Sopian

Abdullah

2016

Journal of Thermodynamics

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This research aims to study, analyze, design, and construct a solar air heater combined with an appropriate phase-change material (PCM) unit. This solar air heater is analogous to a collector integrating a thermal storage unit and a solar thermal collector. In this study, such single-pass solar air heater in amalgamation with PCM was constructed, and several tests were conducted on this device. During the experiments for the solar collector with PCM (spherical capsules), the temperature varied between 30 ∘ C and 35 ∘ C, and the air mass flow rate ranged between 0.03 and 0.09 kg/s. Results confirmed the predicted experimental findings. With the use of paraffin wax-aluminum composite, the thermal storage efficiency of the constructed solar air heater reached a maximum value of 71% at 0.05 kg/s mass flow rate, its charging time decreased by almost 70%, and its cooling rate increased. The thermal storage efficiency of the compound composite was 76.8% at 0.07 kg/s mass flow rate. The results also indicated that the time of charging decreased by almost 60% with the use of paraffin wax-aluminum composite.

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Preparation and thermophysical properties of nanoparticle-in-paraffin emulsion as phase change material

Cited by 334 publications

References 25 publications

Nano-enhanced phase change materials for improved building performance

Nano-enhanced phase change materials for improved building performance

Synergistically-Enhanced Thermal Conductivity of Shape-Stabilized Phase Change Materials by Expanded Graphite and Carbon Nanotube

Enhancement of Integrated Solar Collector with Spherical Capsules PCM Affected by Additive Aluminum Powder

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