Microencapsulated n-octacosane as phase change material for thermal energy storage

Sarı, Ahmet; Alkan, Cemil; Karaipekli, Ali; Uzun, Orhan

doi:10.1016/j.solener.2009.05.008

Cited by 336 publications

(129 citation statements)

References 33 publications

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“…DSC thermograms of encap- sulated OD in PDVB capsules (Figure 7) showed that the H m (153.0 J/g-OD) and H c (151.8 J/g-OD) of encapsulated OD were lower than those of the bulk OD (241.7 and 247.0 J/g of H m 0 and H c 0 , respectively). This phenomenon is quite general for the encapsulation as also observed by other researchers [3,5,6,[9][10][11][15][16][17][18][19]. The possible reason of the reduction of H m and H c of encapsulated heat storage materials is that the phase separation between the polymer shell and heat storage material core was incomplete as in the case of PDVB/HD microcapsules prepared by suspension polymerization [11].…”

Section: Resultssupporting

confidence: 71%

Preparation of polydivinylbenzene/natural rubber capsule encapsulating octadecane: Influence of natural rubber molecular weight and content

Chaiyasat¹,

Waree²,

Songkhamrod

et al. 2012

Express Polym. Lett.

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Abstract. The encapsulation of octadecane (OD) as heat storage material was studied. The core-shell polydivinylbenzene (PDVB)/natural rubber (NR) capsules encapsulating OD was prepared using the Self-assembling of Phase Separated Polymer (SaPSeP) method by suspension polymerization. The mixture of dispersed phase consisting of DVB, NR, OD and benzoyl peroxide was added in polyvinyl alcohol aqueous solution and then homogenized at 5,000 rpm for 5 minutes. The obtained monomer droplet emulsion was subsequently polymerized at 80°C for 8 hours resulting in PDVB/NR capsule encapsulating OD. The influence of molecular weight and content of NR on the encapsulation efficiency and thermal properties of the encapsulated OD were investigated. It was found that both factors affected on the preparation of PDVB/ NR/OD capsule. High molecular weight NR restricted phase separation of formed PDVB. High NR content also reduced phase separation of PDVB due to the increase of internal viscosity. Then, only the incorporation of appropriate molecular weight and content of NR resulted in the formation of PDVB/NR/OD capsule.

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Section: Resultssupporting

confidence: 71%

Preparation of polydivinylbenzene/natural rubber capsule encapsulating octadecane: Influence of natural rubber molecular weight and content

Chaiyasat¹,

Waree²,

Songkhamrod

et al. 2012

Express Polym. Lett.

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“…Various techniques have been proposed to enhance the thermal conductivities of the PCMs, such as filling high-conductivity particles into PCMs [32], incorporating porous matrix materials into PCMs [33][34][35][36][37][38], inserting fibrous materials [39], as well as macro and micro encapsulating the PCMs [40,41] Bugaje [32] reported that the phase change time is one of the most important design parameters in latent heat storage systems and found adding aluminum additives into paraffin wax can significantly reduce the phase change time in heating and cooling processes. However, this method results in weight increasing and high cost of the system.…”

Section: Heat Transfer Enhancementmentioning

confidence: 99%

Review on thermal energy storage with phase change materials (PCMs) in building applications

2012

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Thermal energy storage with phase change materials (PCMs) offers a high thermal storage density with a moderate temperature variation, and has attracted growing attention due to its important role in achieving energy conservation in buildings with thermal comfort. Various methods have been investigated by previous researchers to incorporate PCMs into the building structures, and it has been found that with the help of PCMs the indoor temperature fluctuations can be reduced significantly whilst maintaining desirable thermal comfort. This paper summarises previous works on latent thermal energy storage in building applications, covering PCMs, the impregnation methods, current building applications and their thermal performance analyses, as well as numerical simulation of buildings with PCMs. Over 100 references are included in this paper.

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“…Alkan et al [55] further coated PMMA shell material containing capsules of average diameter 0.70 μm with 35wt% of n-Eicosane. Sari et al [56,57] also produced smaller sizes of NEPCM ranging from 0.14-0.40μm with 43wt% of n-Ocataedcane and 38wt% n-Heptadecane as core materials and at a stirring speed of 2000 rpm. Ma et al [58] produced higher core material content MEPCM which the core material content to be 61.2wt% and its latent heat capacity as much as 101kJ/kg.…”

Section: Emulsion/miniemulsion Polymerizationmentioning

confidence: 99%

Review of solid–liquid phase change materials and their encapsulation technologies

Darkwa

Kokogiannakis

2015

Renewable and Sustainable Energy Reviews

781

267

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Various types of solid-liquid phase change materials (PCMs) have been reviewed for thermal energy storage applications. The review has shown that organic solid-liquid PCMs have much more advantages and capabilities than inorganic PCMs but do possess low thermal conductivity and density as well as being flammable. Inorganic PCMs possess higher heat storage capacities and conductivities, cheaper and readily available as well as being non-flammable, but do experience supercooling and phase segregation problems during phase change process. The review has also shown that eutectic PCMs have unique advantage since their melting points can be adjusted. In addition, they have relatively high thermal conductivity and density but they possess low latent and specific heat capacities. Encapsulation technologies and shell materials have also been examined and limitations established. The morphology of particles was identified as a key influencing factor on the thermal and chemical stability and the mechanical strength of encapsulated PCMs. In general, in-situ polymerization method appears to offer the best technological approach in terms of encapsulation efficiency and structural integrity of core material. There is however the need for the development of enhancement methods and standardization of testing procedures for microencapsulated PCMs. Abstract: Various types of solid-liquid phase change materials (PCMs) have been reviewed for thermal energy storage applications. The review has shown that organic solid-liquid PCMs have much more advantages and capabilities than inorganic PCMs but do possess low thermal conductivity and density as well as being flammable. Inorganic PCMs possess higher heat storage capacities and conductivities, cheaper and readily available as well as being non-flammable, but do experience supercooling and phase segregation problems during phase change process. The review has also shown that eutectic PCMs have unique advantage since their melting points can be adjusted. In addition they have relatively high thermal conductivity and density but they possess low latent and specific heat capacities. Encapsulation technologies and shell materials have also been examined and limitations established. The morphology of particles were identified as a key influencing factor on the thermal and chemical stability and the mechanical strength of encapsulated PCMs. In general, in-situ polymerization method appears to offer the best technological approach in terms of encapsulation efficiency and structural integrity of core material. There is however the need for the development of enhancement methods and standardization of testing procedures for microencapsulated PCMs.

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Microencapsulated n-octacosane as phase change material for thermal energy storage

Cited by 336 publications

References 33 publications

Preparation of polydivinylbenzene/natural rubber capsule encapsulating octadecane: Influence of natural rubber molecular weight and content

Preparation of polydivinylbenzene/natural rubber capsule encapsulating octadecane: Influence of natural rubber molecular weight and content

Review on thermal energy storage with phase change materials (PCMs) in building applications

Review of solid–liquid phase change materials and their encapsulation technologies

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