Structure and thermal properties of octadecane/expanded graphite composites as shape-stabilized phase change materials

Kim, Dowan; Jung, JeYoung; Kim, Youngno; Lee, Miji; Seo, Jongchul; Khan, Sher Bahadar

doi:10.1016/j.ijheatmasstransfer.2015.12.049

Cited by 93 publications

(32 citation statements)

References 26 publications

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“…Pluss polymers have commercialized different PCMs in the temperature range of 30-300 • C for various applications [43]. Kim et al studied the thermal and structural properties of shape-stabilized PCM composites, prepared by using octadecane (OD) and expanded graphite (WEPG) and reported that the OD/WEPG composite with 30% WEPG content showed better shape stability and thermal properties and it can be used in packaging materials [44].…”

Section: Introductionmentioning

confidence: 99%

Development of an acetanilide/benzoic acid eutectic phase change material based thermal energy storage unit for a passive water heating system

Purohit¹,

Murty²,

Dixit³

et al. 2019

Bull Mater Sci

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In the present work, two organic phase change materials (PCMs) are used to develop a new eutectic PCM for sharp melting point with high latent heat of fusion. Optimized eutectic can be suitable for a passive water heating system (PWHS). The binary eutectic PCMs consisting of different compositions of acetanilide and benzoic acid are prepared and optimized at a composition of 30:70 by weight percentage. Optimized samples are characterized by using differential scanning calorimetry (DSC), Fourier transform infrared spectrophotometry and field-emission scanning electron microscopy. The results of DSC showed that melting temperature and latent heat of the optimized eutectic PCM is found to be 75.56 • C and 193.56 J g −1. A negligible change in melting temperature and latent heat of fusion of the optimized eutectic based PCM after 100 accelerated heating and cooling cycles is observed. The prepared eutectic PCM is employed as a thermal energy storage (TES) system for PWHS. The experimental results of a eutectic PCM based TES system for the PWHS show that the use of eutectic helps in enhancing the maximum utility of solar energy during off-shine hours.

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Section: Introductionmentioning

confidence: 99%

Development of an acetanilide/benzoic acid eutectic phase change material based thermal energy storage unit for a passive water heating system

Purohit¹,

Murty²,

Dixit³

et al. 2019

Bull Mater Sci

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“…In practices, this strategy has several limitations. For examples, it was found that at least 30 wt.% EG is required to maintain the leakage at a low level, which substantially reduces the latent heat of the PCM cooling system . Also, the manufacture and the potential fracture of the PCM composite could increase the initial and maintenance costs on the BTM system.…”

Section: Introductionmentioning

confidence: 99%

“…For examples, it was found that at least 30 wt.% EG is required to maintain the leakage at a low level, which substantially reduces the latent heat of the PCM cooling system. 26,27 Also, the manufacture and the potential fracture of the PCM composite could increase the initial and maintenance costs on the BTM system. Recently, the external PCM cooling system was also integrated with active cooling systems such as air cooling and liquid cooling to further enhance the cooling capability and the long-term performance.…”

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confidence: 99%

Performance assessment of a passive core cooling design for cylindrical lithium-ion batteries

Zhao

Liu

2018

Int J Energy Res

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Summary Battery thermal management (BTM) system is an indispensable component for large‐sized lithium‐ion battery packs used in aerospace and automotive applications. Besides providing a proper temperature range for batteries to operate, thus improving their efficiency, lifespan, and safety, the BTM system also needs to be well designed with considering the cost, weight, and practicability. In this paper, an internal passive BTM system is proposed for the cylindrical Li‐ion batteries. The design embeds a phase change material (PCM) filled mandrel inside the battery to achieve the cooling effect. A thermal test cell is first fabricated and tested in a wind tunnel under different cooling scenarios, and it is also used to verify a numerical thermal model. The proposed BTM system is further examined through the model and found to be able to create a preferable environment for batteries to operate. Specifically, the core BTM system consumes less PCM and achieves lower temperature rises and more uniform temperature distributions than an external BTM system. The proposed design can also exert its full latent heat to manage the heat generated from the battery without having a thermally conductive matrix, which is usually composite with PCM in external BTM systems. In addition, experiments show that the battery equipped with the proposed BTM system is ready for intensive cycling tests.

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“…Currently, there are many research works dealing with the preparation of composite materials using EG and PCM. However, almost all of them employ organic PCM [9][10][11][12][13][14][15][16][17][18] and there are only two studies that prepare composite with inorganic PCM for medium [19] and high [20] temperature applications.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of an inorganic magnesium chloride/nitrate/graphite composite for low temperature energy storage

Galazutdinova

Vega

Grágeda

et al. 2018

Solar Energy Materials and Solar Cells

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In this study, an inorganic mixture of 40 wt.% MgCl 2 •6H 2 O and 60 wt.% Mg(NO 3) 2 •6H 2 O was impregnated into two types of the expanded graphite (EG): EG flakes and EG matrix. Different methods of preparation usually used in the organic composite preparation, such as direct blending, vacuum impregnation, ultrasonic impregnation and immersion were applied in this work. Considering the samples with EG matrix, it can be concluded that the optimal result of the encapsulation and ΔH ratio can be reached with the experimental time of 1, 3 and 4 hours using the vacuum, ultrasound and immersion methods, respectively. Moreover, the percentage of encapsulation increases with the experimental time and with the EG percentage for the EG matrix and for the EG flakes, respectively. Concerning the supercooling phenomena, the results show that the presence of EG reduces the difference between fusion and crystallization temperature for up to 65%, acting as а nucleating agent. The resulting composite samples (CPCM) were proved to have good latent heat and a significant reduction of the supercooling effect, which eliminates the need to use nucleating agents, that are essential for pure PCM of 40 wt.% MgCl 2 •6H 2 O and 60 wt.% Mg(NO 3) 2 •6H 2 O. Moreover, using EG suppresses significantly the melting time which indicates the heat transfer enhance of the mixture. This circumstance could allow to empower the utilization of the mentioned mixture in different fields of thermal energy storage at low temperature.

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Structure and thermal properties of octadecane/expanded graphite composites as shape-stabilized phase change materials

Cited by 93 publications

References 26 publications

Development of an acetanilide/benzoic acid eutectic phase change material based thermal energy storage unit for a passive water heating system

Development of an acetanilide/benzoic acid eutectic phase change material based thermal energy storage unit for a passive water heating system

Performance assessment of a passive core cooling design for cylindrical lithium-ion batteries

Preparation and characterization of an inorganic magnesium chloride/nitrate/graphite composite for low temperature energy storage

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