Dispersing different nanoparticles in paraffin wax as enhanced phase change materials

Saydam, Vahit; Duan, Xili

doi:10.1007/s10973-018-7484-4

Cited by 33 publications

(13 citation statements)

References 31 publications

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“…The structure of the carbon-hydrogen chains changes and might have affected how energy is transferred between solid particles of the paraffin wax (molecular mechanism of heat conduction in a solid) [39].…”

Section: Tabmentioning

confidence: 99%

Thermal Performance of the Thermal Storage Energy with Phase Change Material

Bałon

Kiełbasa

Kowalski

et al. 2023

Acta Mechanica Et Automatica

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Values of energy supply and demand vary within the same timeframe and are not equal. Consequently, to minimise the amount of energy wasted, there is a need to use various types of energy storing systems. Recently, one can observe a trend in which phase change materials (PCM) have gained popularity as materials that can store an excess of heat energy. In this research, the authors analysed paraffin wax (cheese wax)’s capability as a PCM energy storing material for a low temperature energy-storage device. Due to the relatively low thermal conductivity of wax, the authors also analysed open-cell ceramic Al2O3/SiC composite foams’ (in which the PCM was dispersed) influence on heat exchange process. Thermal analysis on paraffin wax was performed, determining its specific heat in liquid and solid state, latent heat (LH) of melting, melting temperature and thermal conductivity. Thermal tests were also performed on thermal energy container (with built-in PCM and ceramic foams) for transient heat transfer. Heat transfer coefficient and value of accumulated energy amount were determined.

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Section: Tabmentioning

confidence: 99%

Thermal Performance of the Thermal Storage Energy with Phase Change Material

Bałon

Kiełbasa

Kowalski

et al. 2023

Acta Mechanica Et Automatica

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“…Preparation of PPCM-NPs is usually done using the same methods used to prepare nanofluids, such as sonication, magnetic stirrer, and so on [100,101]. However, stable PPCM-NPs is still one of the most challenging tasks, even in recent literature studies [102]. Figure 4 shows the main preparation steps of PPCM-NPs.…”

Section: Enhancement Techniques For Ppcm Poor Thermal Conductivitymentioning

confidence: 99%

Paraffin As a Phase Change Material to Improve Building Performance: An Overview of Applications and Thermal Conductivity Enhancement Techniques

Al-Yasiri

Szabó

2021

Renew. Energy Environ. Sustain.

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In recent years, phase change materials (PCMs) have increasingly received attention in different thermal energy storage and management fields. In the building sector, paraffin as a phase change material (PPCM) has been introduced as an efficient PCM incorporated in a building envelope, which showed remarkable results. However, the poor thermal conductivity of PPCM is still the topmost drawback in experimental and numerical investigations. In this paper, a general assessment of paraffins, their common uses and applications, have been presented with a particular focus on their potential in building envelope applications. Moreover, the general and desired properties of PPCM are highlighted and evaluated. The primary practical limitation of PPCM of poor thermal conductivity and their effect on PPCM performance is presented and discussed. Correspondingly, the popular techniques applied to improve the poor thermal conductivity are presented and discussed in four categories: the dispersion of nanoparticles, expanded graphite, metallic foam, and extended surfaces technique (fins). All in all, the analysed research works indicated that PPCM based building envelope applications could remarkably improve the thermal performance of buildings in terms of thermal load reduction, energy-saving and thermal comfort. Furthermore, the adoption of enhancement techniques is essential to improve the thermal performance of PPCM in building applications for better utilisation. This review provides a clear vision for the newcomers and interested parties about the main application aspects of PPCM in the building sector for further investigations towards technology commercialisation.

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“…Stability is a particular concern because many wax‐nanoparticle composites have been shown to undergo phase separation after a few heating‐cooling cycles. [ 29 ] Recrystallization of the alkane component appears to exclude the nanoparticles, causing them to aggregate and eventually separate from the wax.…”

Section: Introductionmentioning

confidence: 99%

Using Small Molecule Absorbers to Create a Photothermal Wax Motor

Lui

Bardeen

2021

Small

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Organic phase change materials are used in actuators like wax motors. The solid→liquid phase transition that drives expansion is commonly induced by resistive heating that requires an electrical connection. The use of light to generate a phase change provides a non‐contact way to power wax motors. Here, it is demonstrated that small molecules can act as absorbers to enable a photoinduced solid→liquid melting transition in eicosane, a low molecular weight phase change material. Three different small molecule absorbers are utilized: (2,2,6,6‐tetramethylpiperidin‐1‐yl)oxyl (TEMPO), azobenzene (AZOB), and guaiazulene (GAZ). The GAZ/eicosane mixture is characterized in detail because its absorption extends out to 750 nm, opening up the possibility of using near‐infrared diodes as the photon source. The GAZ/eicosane composite is incorporated into a commercial wax motor assembly and 532 nm laser light is used to lift up to 400 g. The temporal response, work and force output, and efficiency are measured, and no loss of lifting capability or degradation is observed after ten cycles of irradiation. The incorporation of small aromatic molecules with low‐energy absorption features into phase change materials can provide a general way to make light powered wax motors.

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Dispersing different nanoparticles in paraffin wax as enhanced phase change materials

Cited by 33 publications

References 31 publications

Thermal Performance of the Thermal Storage Energy with Phase Change Material

Thermal Performance of the Thermal Storage Energy with Phase Change Material

Paraffin As a Phase Change Material to Improve Building Performance: An Overview of Applications and Thermal Conductivity Enhancement Techniques

Using Small Molecule Absorbers to Create a Photothermal Wax Motor

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