Melting and solidification of PCM embedded in porous metal foam in horizontal multi-tube heat storage system

Esapour, Mehdi; Hamzehnezhad, Arash; Darzi, A. Ali Rabienataj; Jourabian, Mahmoud

doi:10.1016/j.enconman.2018.05.086

Cited by 265 publications

(63 citation statements)

References 26 publications

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“…One of the most important weaknesses of PCMs is their low thermal conductivity that affects their function in energy storage devices in terms of rate of thermal charging and discharging. As extensively studied before [14][15][16][17][18][19][20][21][22], application of extended surfaces such as fins is one of the methods that can address this problem. The thermal conductivity of metal fins is far higher than PCMs that help increase the heat transfer rate between the heat transfer fluid (HTF) and the PCM.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Fin Parameters on the Solidification of PCMs in a Fin-Enhanced Thermal Energy Storage System

et al. 2020

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In the present study, a triplex-tube, employing fin-enhanced phase change materials (PCMs), as a thermal energy storage (TES) system was studied numerically. The main flaw of the PCMs is their low thermal conductivity that restricts their effectiveness for energy storage applications. Metallic (copper) fins are added to the geometry of the system to improve their function by extending the heat transfer area. The effects of the presence, configuration, and dimensions of copper fins were investigated to understand the best design for minimizing the solidification time and achieving the best performance enhancement for the TES system selected for this study. The results revealed that the best performance belonged to fins with a mix configuration, with an attachment angle of 90° and the length and width of 28 mm and 1 mm, respectively. Using this configuration could reduce the required time for complete solidification by around 42% compared to the system without fins. Moreover, it was concluded that increasing the length of the fin could offer its positive effect for enhancing the performance of TES system up to an optimal point only while increasing the width showed a diverse influence. Furthermore, the angles between the tube surface and the fin direction were investigated and 90° was found to be the best choice for the TES case selected in this study. In addition, placement of the fins on the surface of internal or external tube or mix method did not show a significant effect while placing the fins on the external surface of the tube showed even a negative impact on the performance of the TES system compared with when no fins were applied.

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Section: Introductionmentioning

confidence: 99%

The Effects of Fin Parameters on the Solidification of PCMs in a Fin-Enhanced Thermal Energy Storage System

et al. 2020

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“…Second, the structural characteristics of metal foam including permeability, A , inertia coefficient, C i , and porosity ( ε )‐pore density ( ω )‐ligament diameter ( d f ) relationship, they can be determined by the following equations:

\frac{A}{d_{p}^{2}} = 0.00073 {(1 - ε)}^{- 0.224} {(\frac{d_{f}}{d_{p}})}^{- 1.11}

C_{i} = 0.00212 {(1 - ε)}^{- 0.132} {(\frac{d_{f}}{d_{p}})}^{- 1.63}

\frac{d_{f}}{d_{p}} = 1.18 \sqrt{\frac{1 - ε}{3 π} ((), \frac{1}{1 - e^{- (1 - ε) / 0.04}})}

d_{p} = \frac{0.0254}{ω}

…”

Section: Mathematical Modellingmentioning

confidence: 99%

“…A few parameters for the metal foam/paraffin composite have been evaluated before solving the above equations, and they are summarised as follows. First, the metal foam and PCM effective thermal conductivities (k me and k pcm ) are calculated using a three-structured model 29 : Second, the structural characteristics of metal foam including permeability, A, inertia coefficient, C i , and porosity (ε)-pore density (ω)-ligament diameter (d f ) relationship, they can be determined by the following equations 30 :…”

Section: Mathematical Formulations and Numerical Modellingmentioning

confidence: 99%

Performance of a liquid cooling‐based battery thermal management system with a composite phase change material

Zhao

Zou

et al. 2020

Int J Energy Res

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Summary This article reports a recent study on a liquid cooling‐based battery thermal management system (BTMS) with a composite phase change material (CPCM). Both copper foam and expanded graphite were considered as the structural materials for the CPCM. The thermal behaviour of a lithium‐ion battery was experimental investigated first under different charge/discharge rates. A two‐dimensional model was then developed to examine the performance of the BTMS. For the copper foam‐based CPCM modelling, an enthalpy‐porosity approach was applied. The numerical modelling aimed to study the impacts of CPCM types and inlet velocity of heat transfer fluid on both the maximum battery temperature and temperature distribution under different current rates. Dimensional analyses of the results were performed, leading to the establishment of relationships of the Nusselt numbers and dimensionless temperature against the Fourier and Stefan numbers.

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“…However, the low thermal conductivity of PCM is the main disadvantage of its working performances. To overcome its disadvantage, many enhancement techniques have been proposed, such as using porous media/foam metals [10][11][12][13], adding nanoparticles [14][15][16], and expanding the heat transfer area by embedding fins [17][18][19][20][21] or honeycomb structures [22][23][24]. Compared to the former two methods, it is more suitable to expand the heat transfer area for latent thermal energy storage systems due to its low cost and convenience.…”

Section: Introductionmentioning

confidence: 99%

Melting Behavior of Phase Change Material in Honeycomb Structures with Different Geometrical Cores

2019

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Honeycomb structure with phase change material (PCM) is frequently used in passive thermal management devices. The geometrical shape of the honeycomb core greatly influences the melting rate of the PCM. This paper investigates the melting rates of PCM in honeycomb cores of non-hexagonal cells in comparison with that of hexagonal cell in three Rayleigh numbers. The objective is to find the optimal shape in order to reduce the melting time of the PCM. The constrained melting behaviors of PCM in triangular, quadrilateral, hexagonal, and circular honeycomb cores are numerically studied. The enthalpy porosity technique and finite volume method are used in this paper. The instantaneous liquid fraction and energy absorption of PCM in different honeycomb cores are discussed in detail. The influences of the placed orientation and aspect ratio of different cores on melting rates of PCM are considered. Results show that the melting rate of PCM in a rectangular core is always higher than the hexagonal core for the given aspect ratio and Rayleigh number. The geometrical factor (GF), which indicates the cross-sectional area per unit perimeter, is found to be an important index on the melting rate. At a small Rayleigh number, it takes a longer melting time of the PCM for the core with a larger GF. As the Rayleigh number is large, the melting time of the PCM is affected by both the GF and the orientation of the cores.

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Melting and solidification of PCM embedded in porous metal foam in horizontal multi-tube heat storage system

Cited by 265 publications

References 26 publications

The Effects of Fin Parameters on the Solidification of PCMs in a Fin-Enhanced Thermal Energy Storage System

The Effects of Fin Parameters on the Solidification of PCMs in a Fin-Enhanced Thermal Energy Storage System

Performance of a liquid cooling‐based battery thermal management system with a composite phase change material

Melting Behavior of Phase Change Material in Honeycomb Structures with Different Geometrical Cores

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