Preparation and thermal properties of palmitic acid/polyaniline/exfoliated graphite nanoplatelets form-stable phase change materials

Zeng, Ju‐Lan; Zheng, Shuang-Hao; Yu, Sijie; Zhu, Fei; Gan, Juan; Zhu, Ling; Xiao, Zhongliang; Zhu, Xinyu; Zhu, Zongda; Sun, Lidong; Cao, Zhong

doi:10.1016/j.apenergy.2013.10.061

Cited by 113 publications

(47 citation statements)

References 35 publications

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“…During the transition from solid to liquid energy is stored and then recovered during the reverse transformation. 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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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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“…However, the low thermal conductivity of these materials is a significant deficiency [13] making rapid energy recovery very difficult. To overcome this limitation recent research has increasingly focused on developing composites, to improve the thermal performance of the PCMs [14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

A novel heat exchanger concept for latent heat thermal energy storage in solar power towers: Modelling and performance comparison

Badenhorst

2016

Solar Energy

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Highlights• Study introduces spray crystallization as phase change heat recovery option.• Can be directly incorporated into tower of central power tower designs.• Particle diameter found to be largest single influence of tower height.• Prilling feed system identified as critical for further investigation.• Best case result indicates a 20% reduction in plant capital cost is achievable. AbstractThis study presents an innovative new alternative for utilizing phase change materials as energy storage media in solar power towers. The solar power tower prilling or granulation concept combines the existing molten salt design with a prilling tower incorporated into the central receiver. In this way heat transfer limitations normally associated with these systems can be overcome since only very small particles (diameter 1-2 mm) are utilized. Three design cases were considered and a detailed model of the process was developed. The model demonstrates the design dependence on several key variables including particle diameter and the necessity of considering the system in conjunction with the steam generation cycle. Pinch considerations within this cycle and the tower itself determine the operational feasibility. It was found that the receiver design and prilling feed systems are crucial aspects which must be investigated further to refine the concept design and complete a full techno-economic assessment and optimization. The "best case scenario" resulted in a reduction of the circulating salt flow by one third compared to the base case. Preliminary indications are that this would result in a 20% reduction of the * Corresponding author. Tel: +27 12 420 4989. Fax: +27 12 420 2516. E-mail: carbon@up.ac.za 2 overall plant capital cost, but additional costs such as solids handling and a complex receiver design have to be taken into account.

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“…Accordingly, a cost-effective method has been developed by utilizing porous materials as supporting materials to load the organic PCMs to construct form-stable PCMs composites. To date, porous materials, including plaster 9 , carbon aerogel 10 , graphene 11 , carbon nanotubes 12 , exfoliated graphite nanoplatelets 13 , halloysite nanotube 14,15 , conjugated microporous polymers 16 and ceramic composites 17 , have been reported for incorporation of organic PCMs to this end. In fact, the stability of such form-stable PCMs composites depends on the interaction between the organic PCMs and supporting materials to some extent.…”

Section: Introductionmentioning

confidence: 99%

Superhydrophobic Copper Foam Supported Phase Change Composites with High Thermal Conductivity for Energy Storage

et al. 2018

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Superhydrophobic and superoleophilic oxidized copper foam (OCF) was prepared by oxidation of copper foam using (NH 4 ) 2 S 2 O 8 to generate rough surface then followed by modification with low surface energy substance polydimethylsiloxane (PDMS) and stearic acid (SA). Based on sperwetting, form-stable phase change materials (PCMs) composites were obtained by facile absorbing of organic PCMs into PDMS-OCF network. In this way, the organic PCMs can be spontaneously adsorbed and remain stable without leakage even at high temperature over their melting points, and the thermal storage capacity of the as-synthesized PCMs composites were analyzed using a differential scanning calorimeter (DSC). The latent heats of the PDMS-OCF/PCMs composites were measured to be 36.87 J g -1 and 36.81 J g -1 for PDMS-OCF/paraffin and PDMS-OCF/SA, respectively, which is greater than that of untreated copper form (CF)/paraffin composite (8.50 J g -1). The PDMS-OCF/PCMs composite shows better thermal stability and the loaded organic PCM has been reduced by 0.64% after 100 times of melting-cooling recycling for PDMS-OCF/paraffin. The thermal conductivity of PDMS-OCF/paraffin composite is about 9 times that of pure paraffin. Such excellent thermal conductivity as well as good thermal stability of the PDMS-OCF/PCMs makes it promising candidate for thermal energy storage.

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Preparation and thermal properties of palmitic acid/polyaniline/exfoliated graphite nanoplatelets form-stable phase change materials

Cited by 113 publications

References 35 publications

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

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

A novel heat exchanger concept for latent heat thermal energy storage in solar power towers: Modelling and performance comparison

Superhydrophobic Copper Foam Supported Phase Change Composites with High Thermal Conductivity for Energy Storage

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