Non-uniform heat transfer suppression to enhance PCM melting by angled fins

Ji, Chenzhen; Qin, Zhen; Low, Zhenghua; Dubey, Swapnil; Choo, Fook Hoong; Duan, Fei

doi:10.1016/j.applthermaleng.2017.10.030

Cited by 233 publications

(41 citation statements)

References 31 publications

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“…The essence of both is to transfer the heat absorbed by the PCM to the fins, thereby transferring the heat of the fins to the atmosphere environment to achieve the purpose of cooling. According to previous researches, the influence of fins on the heat dissipation performance of PCM-based BTMS was mainly determined by the material [ 92 ], number [ 93 , 94 , 95 , 96 ], length, structure [ 89 , 97 , 98 ] and other parameters. The structures of commonly used fins are shown in Figure 13 .…”

Section: Finsmentioning

confidence: 99%

Phase Change Materials Application in Battery Thermal Management System: A Review

et al. 2020

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The purpose of a battery thermal management system (BTMS) is to maintain the battery safety and efficient use as well as ensure the battery temperature is within the safe operating range. The traditional air-cooling-based BTMS not only needs extra power, but it could also not meet the demand of new lithium-ion battery (LIB) packs with high energy density, while liquid cooling BTMS requires complex devices to ensure the effect. Therefore, phase change materials (PCMs)-based BTMS is becoming the trend. By using PCMs to absorb heat, the temperature of a battery pack could be kept within the normal operating range for a long time without using any external power. PCMs could greatly improve the heat dissipation efficiency of BTMS by combining with fillers such as expanded graphite (EG) and metal foam for their high thermal conductivity or coordinating with fins. In addition, PCMs could also be applied in construction materials, solar thermal recovery, textiles and other fields. Herein, a comprehensive review of the PCMs applied in thermal storage devices, especially in BTMS, is provided. In this work, the literature concerning current issues have been reviewed and summarized, while the key challenges of PCM application have been pointed out. This review may bring new insights to the PCM application.

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Section: Finsmentioning

confidence: 99%

Phase Change Materials Application in Battery Thermal Management System: A Review

et al. 2020

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“…Another possibility to improve the heat transfer and do not suppress the natural convection at the upper part of the enclosure is to change the inclination angle of fins, which was investigated by Ji et al [139]. The fins were inclined upward (Figure 15a) Another possibility to improve the heat transfer and do not suppress the natural convection at the upper part of the enclosure is to change the inclination angle of fins, which was investigated by Ji et al [139]. The fins were inclined upward (Figure 15a) at +15, and +30°, as well as downward (Figure 15b) at −15, and −30°.…”

Section: Enclosure-type Heat Exchangersmentioning

confidence: 99%

The Impact of Heat Exchangers’ Constructions on the Melting and Solidification Time of Phase Change Materials

et al. 2020

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An application of latent heat thermal energy storage systems with phase change materials seems to be unavoidable in the present world. The latent heat thermal energy storage systems allow for storing excessive heat during low demand and then releasing it during peak demand. However, a phase change material is only one of the components of a latent heat thermal energy storage system. The second part of the latent heat thermal energy storage is a heat exchanger that allows heat transfer between a heat transfer fluid and a phase change material. Thus, the main aim of this review paper is to present and systematize knowledge about the heat exchangers used in the latent heat thermal energy storage systems. Furthermore, the operating parameters influencing the phase change time of phase change materials in the heat exchangers, and the possibilities of accelerating the phase change are discussed. Based on the literature reviewed, it is found that the phase change time of phase change materials in the heat exchangers can be reduced by changing the geometrical parameters of heat exchangers or by using fins, metal foams, heat pipes, and multiple phase change materials. To decrease the phase change material’s phase change time in the tubular heat exchangers it is recommended to increase the number of tubes keeping the phase change material’s mass constant. In the case of tanks filled with spherical phase change material’s capsules, the capsules’ diameter should be reduced to shorten the phase change time. However, it is found that some changes in the constructions of heat exchangers reduce the melting time of the phase change materials, but they increase the solidification time.

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“…In fact, the main disadvantage of PCMs is their low thermal conductivities. Researchers considered different ideas to improve heat transfer between the PCMs and a particular boundary or fluid such as extending surfaces using fins [5]. In this paper, two-dimensional CFD simulations were performed to simulate the melting process of a phase change material (PCM) filling a rectangular cavity which includes fins.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of PCM melting filling a rectangular cavity with horizontal partial fins

et al. 2020

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The present numerical study is conducted to analyze melting process within a rectangular enclosure filled by phase change material (PCM) vertically heated from one side. The right hot wall and the left cold wall are maintained at temperatures, Th=38.3 °C and Tc =28.3 °C, respectively, and it was filled by solid PCM Gallium initially at temperature Tc. The horizontal walls are insulated. A transient numerical model is developed to study the heat transfer and melting behaviours, and the natural convection is accounted. To enhance the heat transfer and the melting process of the PCM, fins with a rectangular and triangular shape are proposed. Moreover, the effects of both thermophysical properties and fins integration on the flow structure and heat transfer characteristics are investigated in detail. The melt fraction contours with the natural convection driven flow are performed and compared, as well as the temperature distributions for a Rayleigh number of around Ra= 106. It is found that the rate of the melting increases with the elevation in the values of specific heat capacity Cp as well as the thermal conductivity λ of the PCM Gallium. The results show also that the rectangular fin accelerates the PCM melting faster than the triangular fin’s shape thanks to the increased exchange area.

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Non-uniform heat transfer suppression to enhance PCM melting by angled fins

Cited by 233 publications

References 31 publications

Phase Change Materials Application in Battery Thermal Management System: A Review

Phase Change Materials Application in Battery Thermal Management System: A Review

The Impact of Heat Exchangers’ Constructions on the Melting and Solidification Time of Phase Change Materials

Numerical analysis of PCM melting filling a rectangular cavity with horizontal partial fins

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