Increased thermal conductivity of liquid paraffin-based suspensions in the presence of carbon nano-additives of various sizes and shapes

Yu, Zi‐Tao; Fang, Xin; Fan, Li‐Wu; Wang, Xiao; Xiao, Yao; Zeng, Yi; Xu, Xu; Hu, Ya-Cai; Cen, Kefa

doi:10.1016/j.carbon.2012.10.059

Cited by 171 publications

(53 citation statements)

References 21 publications

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“…As shown in Table 3, the thermal conductivity of CA-MA-PA PCM/xG composites with a mass fraction of 5 % were increased by 14 % by xG-F and 12 % by xG-A. By comparison, Yu et al (2013) reported that the thermal conductivity of pure paraffin at 65 °C was k = 0.1504 W/ (m K) and that addition of multi-walled carbon nanotubes caused only a marginal increase in the absolute value of thermal conductivity of 0.012 W/(m K) at the highest loading of 4 wt%.…”

Section: Thermal Conductivity Of Composite Pcm Compositesmentioning

confidence: 92%

Effects of various types of graphite on the thermal conductivity and energy storage properties of ternary eutectic fatty acid-based composite as phase change material

Jebasingh¹

2016

Renewables

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Energy is the greatest challenge facing the environment. Energy efficiency can be improved by energy storage by management of distribution networks, thereby reducing cost and improving energy usage efficiency. This research investigated the energy efficiency achieved by adding various types of graphite (e.g., flake and amorphous) to organic-based ternary eutectic mixtures like capric acid (CA)-myristic acid (MA)-palmitic acid (PA)-based composite phase change materials (PCMs) under the assistance of ultrasonication to improve thermal properties for thermal energy storage. The graphite was surface modified under a Fresnel lens by using concentration of solar rays, then exfoliation of flake graphite by solar irradiation (xG-F) and exfoliation of amorphous graphite by microwave irradiation (xG-A). For each type of graphite exfoliation, ternary eutectic mixtures with mass concentrations of 5 wt% were prepared. The structure, thermal energy storage properties, and thermal stability of the composite PCM were investigated. Thermal conductivity of the samples in the liquid phase was measured using the transient line source method (KD2Pro). The thermal conductivity was increased by loading xG while energy storage properties were slightly decreased. Furthermore, CA-MA-PA + 5 % xG-F has a slightly modified phase change temperature and enthalpy of melting (T m = 17.5 °C; ΔH m = 143.7 J/g) and freezing (T f = 6.7 °C; ΔH f = 125.5 J/g); this PCM showed higher thermal conductivity of 0.170 W/(m K), representing an increase of up to 114 % relative to the parent material. On the basis of the above results, xG-A was cheaper than xG-F, but they decrease the energy storage capacity according to DSC results obtained at 2 °C/min. CA-MA-PA/xG-F has more potential for use in low temperature energy storage applications.

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Section: Thermal Conductivity Of Composite Pcm Compositesmentioning

confidence: 92%

Effects of various types of graphite on the thermal conductivity and energy storage properties of ternary eutectic fatty acid-based composite as phase change material

Jebasingh¹

2016

Renewables

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“…Fan et al [62] and Yu et al [63] examined the effect of suspending small quantities of carbon nanofillers, including short and long multi-walled carbon nanotubes, carbon nanofibers and graphene nanoplatelets (GNPs), in paraffin wax. It was shown that, compared to the base fluid, the thermal conductivity of the mixture dispersed with a 10% weight faction of GNPs increased up to 164% owning to the reduced thermal interface resistance [62].…”

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

confidence: 99%

Nano-enhanced phase change materials for improved building performance

Lin

Sohel

2016

Renewable and Sustainable Energy Reviews

168

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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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“…Moreover, for the NFPCM with a volume fraction of 0.6 %, there is an appreciable increase in heat transfer with a reduction of 33.64 % in the solidification time. Yu et al [26] investigated the effect of addition of pristine and carboxyl-functionalized short MWCNTs, long MWCNTs, carbon nanofibers, and graphene nanoplatelets (GNPs) on thermal conductivity and viscosity of liquid PW. It was shown that the GNPs have much greater potential in thermal conductivity enhancement than the other carbon nanomaterials.…”

Section: Introductionmentioning

confidence: 99%

Enhanced thermal conductivity of n-octadecane containing carbon-based nanomaterials

2015

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Increased thermal conductivity of liquid paraffin-based suspensions in the presence of carbon nano-additives of various sizes and shapes

Cited by 171 publications

References 21 publications

Effects of various types of graphite on the thermal conductivity and energy storage properties of ternary eutectic fatty acid-based composite as phase change material

Effects of various types of graphite on the thermal conductivity and energy storage properties of ternary eutectic fatty acid-based composite as phase change material

Nano-enhanced phase change materials for improved building performance

Enhanced thermal conductivity of n-octadecane containing carbon-based nanomaterials

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