Innovative method of metal coating of microcapsules containing phase change materials

Al‐Shannaq, Refat; Kurdi, J.; Al‐Muhtaseb, Shaheen A.; Farid, Mohammed

doi:10.1016/j.solener.2016.01.043

Cited by 101 publications

(33 citation statements)

References 55 publications

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“…All capsule materials suffer from a low thermal conductivity, especially organic capsule materials. 179 Wang et al 180 added 10% and 20% expanded graphite to the shell of a melamine-formaldehyde resin; the thermal conductivity of microcapsules increased 10 and 22 times, respectively. Compared with ordinary mPCM with the same concentration, the heat transfer coefficient of mPCM slurry with a metal coating increased by more than 10%.…”

Section: Modification Of Capsule Materialsmentioning

confidence: 99%

“…170 Moreover, the thermal conductivity increased with increasing metal coating coverage until the capsule was fully covered. 179 Wang et al 180 added 10% and 20% expanded graphite to the shell of a melamine-formaldehyde resin; the thermal conductivity of microcapsules increased 10 and 22 times, respectively. Wang et al 181 also increased the thermal conductivity of microcapsules by adding graphene oxide to the silica shell.…”

Section: Modification Of Capsule Materialsmentioning

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: Modification Of Capsule Materialsmentioning

confidence: 99%

Section: Modification Of Capsule Materialsmentioning

confidence: 99%

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

et al. 2019

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“…It is interesting to mention here that Ag + ions may be repelled because of the hydrophobic nature of paraffin wax and it eventually restrains deposition on the paraffin microsphere. Another hypothesis is comparatively lack of surface activation 15 for PW microspheres. Therefore, problems in the encapsulation may be overcome by introducing AgNO 3 in non-aqueous form or alternatively providing sufficient surface activation using suitable bio-inspired catechol polymers 22 .…”

Section: Confirmation Tests For Encapsulationmentioning

confidence: 99%

“…Recently, a new method has been reported in the literature wherein poly (methyl methacrylate) (PMMA) PCM microcapsules were coated with silver using electroless coating technique. Using metal coating, the thermal conductivity of the PCM microcapsules is increased from 0.189 W/mK to 2.41 W/ mK 15 . However, in this dual encapsulation, PMMA serves as high thermal resistance between PCM and silver shell coating.…”

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confidence: 99%

Microencapsulation of Paraffin Wax Microspheres with Silver

et al. 2018

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Microencapsulation of phase change materials (PCMs) with metallic shell materials is a very innovative and challenging task. This can mitigate the problems related to thermal barrier for conventional nonconductive shell materials as well as enhance mechanical properties of PCM microcapsules. Such microcapsules can be integrated into microelectronic devices for their intermittent thermal management in mission critical components. The present work is aimed at developing a new method to synthesise phase change material encapsulated with metallic shell material and characterising the same. Paraffin wax microspheres were first synthesised and then encapsulated with silver through in situ chemical reduction. Further more, a new set of experiments were identified to analyse the quality of encapsulation. The thermal properties were investigated under differential scanning calorimeter and thermogravimetric analyser. The average diameter of paraffin wax microspheres (PW) is found to be ±329 µm. It reveals from DSC analysis that the enthalpy of fusion is minimum for PW@Ag-PVA amongst all others. Accordingly, higher deposition of Ag is possible for PW@Ag-PVA. This is also supported by TGA results where PW@Ag-PVA has only 40 per cent mass loss and the remaining samples have 100 per cent. However, even for PW@Ag-PVA the encapsulation is found incomplete. The present work provides knowhow of the difficulties associated with encapsulation of PCMs with metallic shell material.

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“…Mg(OH)2 or Al(OH)3 can function as shell material [19]. Li Na [20] prepared magnesium coated RP and showed that when the content of magnesium hydroxide in inorganic RP was 30%, the coating rate could reach to 85.5%, resulting in an efficient encapsulated method.…”

Section: Inorganic Shell Materialsmentioning

confidence: 99%

Review on the preparation and modified technologies of microencapsulated red phosphorus

Cheng¹,

Du²,

Yan³

2017

AIP Conference Proceedings

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Innovative method of metal coating of microcapsules containing phase change materials

Cited by 101 publications

References 55 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

Microencapsulation of Paraffin Wax Microspheres with Silver

Review on the preparation and modified technologies of microencapsulated red phosphorus

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