Heat transfer enhancement of paraffin wax using graphite foam for thermal energy storage

Zhong, Yajuan; Guo, Quangui; Li, Sizhong; Shi, Jingli; Liü, Lang

doi:10.1016/j.solmat.2010.02.004

Cited by 206 publications

(47 citation statements)

References 24 publications

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“…Investigations on graphite foam composites (Sedeh and Khodadadi [101], Zhong et al [127], Song et al [113]) and metal foams based on aluminium (Jiang et al [54]) have been conducted. Graphite foam composites have shown potential for creating a structure with high thermal conductivity (ranging from 230-570 times higher than the original PCM).…”

Section: Enhancing Heat Transfermentioning

confidence: 99%

Phase change materials and products for building applications: A state-of-the-art review and future research opportunities

Kalnæs

Jelle

2015

Energy and Buildings

472

232

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Phase change materials (PCM) have received considerable attention over the last decade for use in latent heat thermal storage (LHTS) systems. PCMs give the ability to store passive solar and other heat gains as latent heat within a specific temperature range, leading to a reduction of energy usage, an increase in thermal comfort by smoothing out temperature fluctuations throughout the day and a reduction and/or shift in peak loads. The interest around PCMs has been growing significantly over the last decade. Hence, several commercial products have arrived on the market with various areas of use in building applications. This study reviews commercial state-of-the-art products found on the market and show some of the potential areas of use for PCMs in building applications. Examples of how PCMs can be integrated into buildings, and furthermore building materials and projects using PCMs that have already been realised, have also been reviewed. There seems to be a scarcity of data published on actual performance in real life applications so far. However, many laboratory and full scale experiments have shown positive results on energy savings. Furthermore, future research opportunities have been explored and challenges with the technology as of today have been discussed.

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Section: Enhancing Heat Transfermentioning

confidence: 99%

Phase change materials and products for building applications: A state-of-the-art review and future research opportunities

Kalnæs

Jelle

2015

Energy and Buildings

472

232

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“…However, the low thermal conductivity of these materials is a significant issue [30,31]. To overcome this limitation recent research has increasingly focused on developing composites with graphite foams, to improve the thermal performance of the PCMs [32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

The use of graphite foams for simultaneous collection and storage of concentrated solar energy

Badenhorst

Fox

Mutalib

2016

Carbon

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Graphite foams of varying composition and density were prepared using a low cost, local pitch material and expandable graphite for use in solar energy capture. The foams have a high degree of graphitization but exhibit a fine mosaic texture. A small oxidative treatment (6% mass loss) was necessary to fully open the foam pores. As the density is reduced a large decrease in the foam surface area was observed. Despite this, an increase in solar energy capture efficiency was measured due to increased circulation through the foam. By varying foam geometry and the concentration ratio it was demonstrated that the receiver size can be reduced by 75% at the same efficiency.The foam with the lowest density was used to test the thermal performance of a simultaneous energy capture and storage concept using a phase change material. The melting time of the phase change material is reduced by 46% whilst only reducing the energy storage density by 18%. In addition it was found that the foam composite resulted in more ideal phase transition behaviour due to the elimination of incongruent melting. The composite can effectively capture, store and discharge thermal energy, at a constant temperature, without any additional requirements.

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“…Concerning materials used in research studies, they are given generally by use priority: Paraffin family organic Compounds, hydrates and eutectic components [38]. Each of these MCPs has its own properties, which can be improved by different configurations by adding onto these characteristics such integration of metal strands to increase its thermal conductivity; the addition of a nucleating agent can eliminate the super-cooling and the use of a suitable PCM thickness can prevent the incongruous fusion.…”

Section: Discussionmentioning

confidence: 99%

Phase Change Materials for Building Applications: A Thorough Review and New Perspectives

2018

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Abstract:The purpose of this paper is to provide a comprehensive report on the state of the art on the technologies used in the modeling of energy storage systems by latent heat in buildings, and draw lines on perspectives on the technology evolution in this sector. In the first part, the emphasis is put mainly on the two main lines of research: experimental and numerical. In the second part, the main trends of research in this sector have been followed. An anatomical operation of more than 100 documents (published between 2006 and 2016), on the behavior of storage systems integrating Phase Change Materials (PCM), covering a large number of configurations treatment and their applications in thermal comfort of buildings area, has shown that the information published in this topic are very diverse and enormous, but in many cases are insufficient. The results show that, with suitable design, the PCM can contribute to the reduction of costs and achieve energy reductions in buildings, guaranteeing a comfortable interior environment. The evaluation of this multitude of documents gave the following remark: The effectiveness of any proposed approach to a numerical study is a concept with ambiguities, depending upon the method used, its precision, the problem to be modeled, the convergence criteria and the input parameters choice. The diversity of experimental conditions and the variety of results revealed that the published works are not directly comparable.

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Heat transfer enhancement of paraffin wax using graphite foam for thermal energy storage

Cited by 206 publications

References 24 publications

Phase change materials and products for building applications: A state-of-the-art review and future research opportunities

Phase change materials and products for building applications: A state-of-the-art review and future research opportunities

The use of graphite foams for simultaneous collection and storage of concentrated solar energy

Phase Change Materials for Building Applications: A Thorough Review and New Perspectives

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