Organic phase change materials confined in carbon-based materials for thermal properties enhancement: Recent advancement and challenges

Tong, Xuan; Li, Nianqi; Zeng, Min; Wang, Qiuwang

doi:10.1016/j.rser.2019.03.031

Cited by 163 publications

(52 citation statements)

References 164 publications

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“…To overcome the liquid leakage and low thermal conductive defects of organic PCMs, the shape-stable phase change materials (ss-PCMs) were prepared using the porous matrixes as the supports of organic PCMs 10 , 11 . There are many types of matrixes were used to prepare ss-PCMs, including mesoporous carbon 12 , meso-porous silica 11 , graphene 13 , carbon nanotubes 14 , metal foams 5 , etc.…”

Section: Introductionmentioning

confidence: 99%

Shape-stabilized phase change material with highly thermal conductive matrix developed by one-step pyrolysis method

Chen

et al. 2021

Sci Rep

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Metal microspheres doping porous carbon (MMPC), which was prepared using in-situ pyrolysis reduction strategy, could enhance the thermal conductivity of shape-stabilized phase change material (ss-PCM) prepared by MMPC as the matrix. However, in previous studies that were reported, the preparation of MMPC needed to synthesize porous carbon by pyrolysis firstly, and then porous carbon adsorbed metal ions was pyrolyzed again to obtain MMPC, which was tedious and energy-prodigal. In this study, a one-step pyrolysis strategy was developed for the synthesis of MMPC through the pyrolyzation of wheat bran adsorbed copper ions, and the copper microspheres doping wheat bran biochar (CMS-WBB) was prepared. The CMS-WBB was taken as the supporter of stearic acid (SA) to synthesize the ss-PCM of SA/CMS-WBB. The study results about the thermal properties of SA/CMS-WBB demonstrated that the introduction of copper microspheres could not only improve the thermal conductivity of SA/CMS-WBB, but also could increase the SA loading amount of wheat bran biochar. More importantly, the CMS-WBB could be obtained by only one-step pyrolysis, which greatly simplified the preparation process and saved energy consumption. Furthermore, the raw material of wheat bran is a kind of agricultural waste, which is abundant, cheap and easy to obtain. Hence, the SA/CMS-WBB synthesized in this study had huge potentialities in thermal management applications, and a simplified method for improving the thermal properties of ss-PCMs was provided.

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Section: Introductionmentioning

confidence: 99%

Shape-stabilized phase change material with highly thermal conductive matrix developed by one-step pyrolysis method

Chen

et al. 2021

Sci Rep

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“…A widely diffused class of PCM is that of latent heat PCMs, where thermal energy is stored/released by melting/solidification transition/s. Composite PCMs are another class of PCM, partly overlapped to Latent Heat-PCMs (LH-PCMs), defined as composite materials made of two phases: The active phase, which guarantees good latent thermal energy storage properties, and the passive phase, which must avoid phase changes during the entire range of working temperatures [1,3,4,5,6,7,8,9]. In the following paper, the focus will be on C-PCM in which the active phase is an LH-PCM and the passive phase has principally the thermal conductivity enhancement role.…”

Section: Introductionmentioning

confidence: 99%

“…Further, in some cases, other structural or functional properties need to be associated with C-PCMs [3]. Examples of these C-PCM include the addition of graphene or graphite to polymeric PCMs [1,3,8,10], PCM impregnation into porous high-melting materials [1,3], micro-encapsulation [1,4], metallic alloys made by immiscible phases [5,6,7] can be adopted in PCM-based components. Considering high length scale C-PCMs, this can vary significantly from submicrometric to micrometric to hundreds of micrometers, to millimetric size (as shown in Figure 1).…”

Section: Introductionmentioning

confidence: 99%

Methods to Characterize Effective Thermal Conductivity, Diffusivity and Thermal Response in Different Classes of Composite Phase Change Materials

2019

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The phase change materials (PCMs) used in devices for thermal energy storage (TES) and management are often characterized by low thermal conductivity, a limit for their applicability. Composite PCMs (C-PCM), which combine active phase (proper PCM) with a passive phase with high conductivity and melting temperature have thus been proposed. The paper deals with the effect of length-scale on thermal characterization methods of C-PCM. The first part of the work includes a review of techniques proposed in the scientific literature. Up to now, special focus has been given to effective thermal conductivity and diffusivity at room or low temperature, at which both phases are solid. Conventional equipment has been used, neglecting length-scale effect in cases of coarse porous structures. An experimental set-up developed to characterize the thermal response of course porous C-PCMs also during active phase transition at high temperature is then presented. The setup, including high temperature-heat flux sensors and thermocouples to be located within samples, has been applied to evaluate the thermal response of some of the above C-PCMs. Experimental test results match Finite Elements (FE) simulations well, once a proper lattice model has been selected for the porous passive phase. FE simulations can then be used to estimate temperature difference between active and passive phase that prevents considering the C-PCM as a homogeneous material, to describe it by effective thermo-physical properties. In the engineering field, under these conditions, the design steps for TES systems design cannot be simplified by considering C-PCMs as homogeneous materials in FE codes.

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“…[9][10][11][12] Methods for LHS performance enhancement include extending heat transfer surface, [13][14][15][16][17][18][19] improving process uniformity 7,20 and enhancing PCM conductivity. [9][10][11][12] Methods for LHS performance enhancement include extending heat transfer surface, [13][14][15][16][17][18][19] improving process uniformity 7,20 and enhancing PCM conductivity.…”

Section: Introductionmentioning

confidence: 99%

“…In order to improve the performance of latent heat storage systems, researchers have conducted a large number of studies. [9][10][11][12] Methods for LHS performance enhancement include extending heat transfer surface, [13][14][15][16][17][18][19] improving process uniformity 7,20 and enhancing PCM conductivity. [21][22][23][24][25][26][27][28][29] Lohrasbi et al 13 and Kabbara et al 14 used axially fins and radially fins, respectively, to extend the heat transfer surface area.…”

mentioning

confidence: 99%

Conduction paths of backbones for thermal enhancement of nanocomposite phase change materials

Zhou

Zhao

et al. 2019

Int J Energy Res

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Thermal energy storage (TES) based on phase change materials (PCMs) has become a research hot spot due to its high energy storage density and maintained operating temperature during the phase change. However, as PCM has a poor thermal conductivity that can be as low as 0.2~0.5 W/m·K, the charging/discharging processes of PCM modules are significantly restrained, which severely affects the application of the TES technology in industrial sectors. This study concerns the improvement of the effective thermal conductivity of composite PCM formed by adding nanoparticles with high thermal conductivity into different PCMs. A theoretical model is established to reveal the intrinsic mechanism for the promotion of thermal conductivity of composite PCM consisting of nanoparticles. The results show that aggregation and interfacial thermal resistance are the main reasons for the change of the thermal conductivity. By forming effective conduction paths composed of backbones in the composite PCM, the average thermal conductivity can be improved significantly, which can be as high as 10~50 W/m·K with a wide range of volume fraction of the additives.

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Organic phase change materials confined in carbon-based materials for thermal properties enhancement: Recent advancement and challenges

Cited by 163 publications

References 164 publications

Shape-stabilized phase change material with highly thermal conductive matrix developed by one-step pyrolysis method

Shape-stabilized phase change material with highly thermal conductive matrix developed by one-step pyrolysis method

Methods to Characterize Effective Thermal Conductivity, Diffusivity and Thermal Response in Different Classes of Composite Phase Change Materials

Conduction paths of backbones for thermal enhancement of nanocomposite phase change materials

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