A review on encapsulation techniques for inorganic phase change materials and the influence on their thermophysical properties

Milián, Yanio E.; Gutiérrez, Andrea; Grágeda, Mario; Ushak, Svetlana

doi:10.1016/j.rser.2017.01.159

Cited by 404 publications

(159 citation statements)

References 87 publications

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“…98,99 For low-and medium-temperature solar energy utilization, PCM storage containers for SACS can be divided into bulk storage and (small volume) encapsulation storage. 101 Encapsulated PCMs are generally used for microencapsulation and nanoencapsulation with diameters smaller than 1 cm and 1 mm, respectively. It can be further divided into the following: plate, multitube, concentric tube, shell-andtube, and spiral tube.…”

Section: Classification Of Containersmentioning

confidence: 99%

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Review of latent thermal energy storage systems for solar air‐conditioning systems

et al. 2019

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Solar air conditioning is an important approach to satisfy the high demand for cooling given the global energy situation. The application of phase-change materials (PCMs) in a thermal storage system is a way to address temporary power problems of solar air-conditioning systems. This paper reviews the selection, strengthening, and application of PCMs and containers in latent thermal storage system for solar air-conditioning systems. The optimization of PCM container geometry is summarized and analyzed. The hybrid enhancement methods for PCMs and containers and the cost assessment of latent thermal storage system are discussed. The more effective heat transfer enhancement using PCMs was found to mainly involve micro-nano additives. Combinations of fins and nanoadditives, nanoparticles, and metal foam are the main hybrid strengthening method. However, the thermal storage effect of hybrid strengthening is not necessarily better than single strengthening. At the same time, the latent thermal storage unit has less application in the field of solar airconditioning systems, especially regarding heat recovery, because of its cost and thermal storage time. The integration of latent thermal storage units and solar air-conditioning components, economic analysis of improvement technology, and quantitative studies on hybrid improvement are potential research directions in the future.

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Section: Classification Of Containersmentioning

confidence: 99%

“…150 Therefore, a spherical shape is the common shape for encapsulation. 101,152,153 Hence, they are important design factors for capsules. 101,152,153 Hence, they are important design factors for capsules.…”

Section: Encapsulation Storage For a Small Volumementioning

confidence: 99%

Review of latent thermal energy storage systems for solar air‐conditioning systems

et al. 2019

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“…In contrary, the addition of conductive fillers and flame‐retardants has reduced the disadvantages of OPCMs. However, these efforts would certainly lessen the energy storage density of PCMs due to the presence of inactive mass . At present, nanoconfinement technologies have attracted a lot of interest and present a new opportunity for considerable refinement in the thermophysical properties of PCMs while sustaining their energy storage capacity .…”

Section: Introductionmentioning

confidence: 99%

The micro‐/nano‐PCMs for thermal energy storage systems: A state of art review

et al. 2019

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Summary With advancement in technology—nanotechnology, various thermal energy storage (TES) materials have been invented and modified with promising thermal transport properties. Solid‐liquid phase change materials (PCMs) have been extensively used as TES materials for various energy applications due to their highly favourable thermal properties. The class of PCMs, organic phase change materials (OPCMs), has more potential and advantages over inorganic phase change materials (IPCMs), having high phase change enthalpy. However, OPCMs possess low thermal conductivity as well as density and suffer leakage during the melting phase. The encapsulation technologies (ie, micro and nano) of PCMs, with organic and inorganic materials, have a tendency to enhance the thermal conductivity, effective heat transfer, and leakage issues as TES materials. The encapsulation of PCMs involves several technologies to develop at both micro and nano levels, called micro‐encapsulated PCMs (micro‐PCM) and nano‐encapsulated PCMs (nano‐PCM), respectively. This study covers a wide range of preparation methods, thermal and morphological characteristics, stability, applications, and future perspective of micro‐/nano‐PCMs as TES materials. The potential applications, such as solar‐to‐thermal and electrical‐to‐thermal conversions, thermal management, building, textile, foam, medical industry of micro‐ and nano‐PCMs, are reviewed critically. Finally, this review paper highlights the emerging future research paths of micro‐/nano‐PCMs for thermal energy storage.

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“…Porous titanium dioxide (TiO 2 ) is an important inorganic supporting material for composite PCMs, owing to its specific surface area, unique pore structure, high thermal stability, nontoxicity, fire resistance, and low density . However, composite PCMs still suffered from low thermal conductivity, which affects thermal transport performance …”

Section: Introductionmentioning

confidence: 99%

“…20 However, composite PCMs still suffered from low thermal conductivity, which affects thermal transport performance. 21,22 Improving the thermal conductivity of porous composite PCMs is a key point in recent TES research. Several studies have investigated the ability of high-conductivity inserts comprising metallic and carbon foams to enhance PCMs thermal conductivity.…”

Section: Introductionmentioning

confidence: 99%

Enhanced thermal conductivity of copper‐doped polyethylene glycol/urchin‐like porous titanium dioxide phase change materials for thermal energy storage

et al. 2019

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Summary A composite phase change material (PCM) of copper‐doped polyethylene glycol (PEG) 2000 impregnated urchin‐like porous titanium dioxide (TiO2) microspheres (PEG/TiO2) was successfully synthesised. The urchin‐like porous TiO2 structures contain hollow cavities that can provide a high PEG loading capacity of up to 80 wt%. Copper nanoparticles were uniformly dispersed on the outer and inner surfaces of the 0.8PEG/TiO2 as additives to enhance the thermal conductivity of the composite PCM. The latent heat of the Cu/PEG/TiO2 porous composite PCM reached 133.8 J/g, and the thermal conductivity was 0.58 W/(mK), which was 152.2% higher than that of TiO2 and 38.1% higher than 0.8PEG/TiO2. Moreover, the Cu/PEG/TiO2 porous composite PCM has excellent thermal stability and reliability.

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A review on encapsulation techniques for inorganic phase change materials and the influence on their thermophysical properties

Cited by 404 publications

References 87 publications

Review of latent thermal energy storage systems for solar air‐conditioning systems

Review of latent thermal energy storage systems for solar air‐conditioning systems

The micro‐/nano‐PCMs for thermal energy storage systems: A state of art review

Enhanced thermal conductivity of copper‐doped polyethylene glycol/urchin‐like porous titanium dioxide phase change materials for thermal energy storage

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