Latent energy storage: Melting process around heating cylinders

Kousksou, T.; Mahdaoui, Mustapha; Hlimi, M.; Alaiji, Rachid El; Rhafiki, T. El

doi:10.1016/j.csite.2016.06.010

Cited by 10 publications

(4 citation statements)

References 34 publications

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“…C is a constant measuring the shape evaluation of the melting zone and ε is a very small value to avoid the zero division. For further details regarding the resolution method and phenomenon description, readers are referred to previous works [45][46][47][48][49]. The thermal properties of the used PCM (n-eicosane) are listed in Table 1 [50].…”

Section: Phase Change Formulationmentioning

confidence: 99%

Optimization of melting and solidification processes of PCM: Application to integrated collector storage solar water heaters (ICSSWH)

et al. 2018

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This work presents a detailed analysis of an improved Integrated Collector Storage Solar Water Heater (ICSSWH). This type of device is well suited for rural areas of Morocco because of its low cost, simplicity and compact structure. The innovation targeted in this system lies in the integration of a latent storage system by using a layer of phase change materials (PCM) in its lower part. Indeed, this integration is likely to increase the thermal energy delivered to the user during the night. The overall performance of the system depends on external climate data, type of PCM used and its mass, and flow rate of water. N-eicosane is considered as PCM in this application while hourly weather data corresponding to the city ER-RACHIDIA is used for the analysis. A detailed 2-D transient simulation has been established to optimize the system performance by studying the effect of different design variables and operating conditions. A deep analysis was also made to understand the PCM melting and solidification processes for a better exploitation of this storage technique. Optimized results are obtained when a mass flow rate of 0.0015 kg/s is used with a PCM thickness of 0.01 m and a set temperature of 313 K.

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Section: Phase Change Formulationmentioning

confidence: 99%

Optimization of melting and solidification processes of PCM: Application to integrated collector storage solar water heaters (ICSSWH)

et al. 2018

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“…Heat transfer in the phase change materials is complicated by the presence of a moving border. Many studies have been shown that, at the initial stage, conductive heat transfer dominates in the region, however, with the growth of the melt region, an intensive regime of natural convection develops [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Computational Study of Heat Transfer inside Different PCMs Enhanced by Al2O3 Nanoparticles in a Copper Heat Sink at High Heat Loads

2020

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The cooling of electronic elements is one of the most important problems in the development of architecture in electronic technology. One promising developing cooling method is heat sinks based on the phase change materials (PCMs) enhanced by nano-sized solid particles. In this paper, the influence of the PCM’s physical properties and the concentration of nanoparticles on heat and mass transfer inside a closed radiator with fins, in the presence of a source of constant volumetric heat generation, is analyzed. The conjugate problem of nano-enhanced phase change materials (NePCMs) melting is considered, taking into account natural convection in the melt under the impact of the external convective cooling. A two-dimensional problem is formulated in the non-primitive variables, such as stream function and vorticity. A single-phase nano-liquid model is employed to describe the transport within NePCMs.

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“…Particularly, melting coupled with natural convection in enclosures containing a PCM has been the subject of many experimental and numerical studies due its wide area of interest in several fields such as passive cooling of electrical or electronic components, thermal insulation and latent energy storage [2,3]. The effectiveness of cooling devices using PCM integrated in electrical components depends on the melting speed of the PCM so that the latent heat plays its role rapidly but also over time [4]. However, there are few studies in the literature reports including fins integration of PCMs, which have significant potential to enhance the thermal performance of PCMs.…”

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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Latent energy storage: Melting process around heating cylinders

Cited by 10 publications

References 34 publications

Optimization of melting and solidification processes of PCM: Application to integrated collector storage solar water heaters (ICSSWH)

Optimization of melting and solidification processes of PCM: Application to integrated collector storage solar water heaters (ICSSWH)

Computational Study of Heat Transfer inside Different PCMs Enhanced by Al2O3 Nanoparticles in a Copper Heat Sink at High Heat Loads

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

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