Numerical simulation of the melting and solidification processes of two organic phase change materials in spherical enclosures for cold thermal energy storage applications

Cofré‐Toledo, Jonathan; Roa-Cossio, Diego; Vasco, Diego A.; Cabeza, Luisa F.; Rouault, Fabien

doi:10.1016/j.est.2022.104337

Cited by 21 publications

(8 citation statements)

References 26 publications

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“…Figures 17 and 18 depict the predicted heat fluxes obtained during the melting and solidification processes of Octadecane and both NEPCMs, respectively. The heat flux

q^{″}

through the surface of the spherical enclosure is obtained by using the liquid fractions 48 . The energy balance between the heat flux and Newton's cooling law is given by:

q^{″} = \frac{V}{A} ∙ \frac{italicdH}{italicdt} = h ∙ ∆ T,

where

V

is the PCM volume,

A

is the sphere surface area,

H

is the enthalpy per unit volume,

h

is the convective coefficient, and

∆ T

is the temperature gradient.…”

Section: Results and Analysismentioning

confidence: 99%

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Numerical prediction of the solidification and melting of encapsulated nano‐enhanced phase change materials

Cofré‐Toledo,

Muñoz‐Cuevas,

Jofré‐Severino

et al. 2023

Energy Storage

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The thermal properties of Octadecane vary due to the addition of copper oxide (CuO) nanoparticles. The synthesis of two nano‐enhanced phase change material (NEPCM) required the implementation of the two‐step method, using Octadecane as the base phase change material and CuO nanoparticles at 2.5 and 5.0 wt%. The experimental characterization determined the specific heat capacity, and thermal conductivity of the NEPCMs solid phase, including phase change enthalpy and temperature. These experimental results were then utilized for computational simulation of the thermal charging (solidification) and discharging (melting) processes of NEPCMs within a spherical enclosure, employing the ANSYS/Fluent software. The incorporation of CuO nanoparticles led to an increase in thermal conductivity while causing a decrease in specific heat capacity, enthalpy, and phase change temperature of Octadecane. The computational results revealed a reduction in the melting period and an improvement in the solidification of both NEPCMs. In terms of melting, the convective heat transfer coefficient increased by approximately 27.4% and 3.2% for the NEPCM at 2.5 and 5.0 wt% CuO, respectively. During the solidification process, the overall heat transfer coefficient experienced a significant increase of 43.8% and 59.8% for the NEPCM at 2.5 and 5.0 wt%, respectively.

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“…Figures 17 and 18 depict the predicted heat fluxes obtained during the melting and solidification processes of Octadecane and both NEPCMs, respectively. The heat flux

q^{″}

through the surface of the spherical enclosure is obtained by using the liquid fractions 48 . The energy balance between the heat flux and Newton's cooling law is given by:

q^{″} = \frac{V}{A} ∙ \frac{italicdH}{italicdt} = h ∙ ∆ T,

where

V

is the PCM volume,

A

is the sphere surface area,

H

is the enthalpy per unit volume,

h

is the convective coefficient, and

∆ T

is the temperature gradient.…”

Section: Results and Analysismentioning

confidence: 99%

“…The heat flux q 00 through the surface of the spherical enclosure is obtained by using the liquid fractions. 48 The energy balance between the heat flux and Newton's cooling law is given by:…”

Section: Heat Fluxmentioning

confidence: 99%

Numerical prediction of the solidification and melting of encapsulated nano‐enhanced phase change materials

Cofré‐Toledo,

Muñoz‐Cuevas,

Jofré‐Severino

et al. 2023

Energy Storage

Self Cite

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“…The horizontal rectangular shapes were found to have the shortest melting and solidification times. Cofré-Toledo et al proposed a unified power-law-based Nusselt correlation to aid in the design of LHS systems with a higher heat transfer coefficient. Due to low cost and ease of maintenance, various fin configurations have been developed to increase the melting/solidification rates of LHS systems (Figure (a)). The longitudinal fin, pin fin, circular fin, helical fin, Y-shaped fin, tree fin, and honeycomb fin are just a few examples.…”

Section: Phase Change For Thermal Management (Tm)mentioning

confidence: 99%

“…The horizontal rectangular shapes were found to have the shortest melting and solidification times. Cofre-Toledo et al 267 proposed a unified power-law-based Nusselt correlation to aid in the design of LHS systems with a higher heat transfer coefficient.…”

Section: Thermal Enhancementmentioning

confidence: 99%

Recent Advances in CFD Simulations of Multiphase Flow Processes with Phase Change

Zhu

Zhang

et al. 2023

Ind. Eng. Chem. Res.

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Phase change is a phenomenon that has been extensively utilized in chemical engineering, energy, electronics, vehicle, and space exploration. From both the science and engineering perspectives, gaining a profound understanding of the intricacies of multiphase flow processes accompanied by heat and mass transfer due to phase change is of fundamental importance. Indeed, the computational fluid dynamics (CFD) has been increasingly applied as an effective tool to give an in-depth and efficient analysis of the phase change processes, thereby enhancing our understanding and capacity to control and optimize the phase change effects in these processes. This paper seeks to provide a comprehensive review of the utilization of CFD methodologies in the simulations of phase change flows across various applications, including temperature management, drying, separation and purification, and others. First, the CFD models at various scales that are developed to elucidate the phase change processes are summarized. Second, the noteworthy advances in the recent CFD simulation work on various phase change processes are presented, respectively. Finally, the challenges and potential prospects to facilitate the application of the phase change flow are discussed. The current review aims to offer insightful guidance for the CFD modeling of phase change processes in numerous engineering application scenarios.

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“…Latent heat thermal energy storage (LHTES) systems, which are based on phase change materials (PCMs), are able to absorb excessive thermal energy from solar energy and adjust the indoor ambient temperature by the reversible phase transition process. − Among various PCMs, organic PCMs such as paraffin, fatty acids, and alcohols have received tremendous attention because of their high energy storage density, excellent chemical stability, suitable phase transition temperatures, nontoxic, and noncorrosive . However, the liquid leakage issues of organic PCMs during solid–liquid phase transition severely restrict their practical application for thermal energy storage. − …”

Section: Introductionmentioning

confidence: 99%

Flame-Retardant and Form-Stable Delignified Wood-Based Phase Change Composites with Superior Energy Storage Density and Reversible Thermochromic Properties for Visual Thermoregulation

Wang

Yue

et al. 2023

ACS Sustainable Chem. Eng.

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The development of form-stable phase change materials (PCMs) with flame retardancy and the visual thermal storage process is crucial for their application in building energy conservation. Herein, an active phosphorus/ammonium-containing non-formaldehyde flame retardant (APA) was synthesized based on the natural compound phytic acid. Then, wood-based form-stable PCM composites (PTPCMs) with high energy storage density, excellent flame retardancy, and real-time and visual reversible thermochromic properties were successfully fabricated by impregnating the thermochromic compound into the APA-grafted delignified wood. The delignified wood well supports the solid–liquid PCMs and avoids their liquid leakage during phase transition due to the high surface tension and strong capillary effect. The differential scanning calorimetry (DSC) results showed that the PTPCMs possessed high thermal energy storage density (165.3–198.6 J/g) and reliable thermal stability. With the concentration of the flame-retardant APA increased, the peak heat release rate (pHRR) and total heat release (THR) of PTPCMs reduced noticeably, demonstrating the enhanced flame retardancy of PTPCMs. Moreover, PTPCM composites had good thermoregulation properties and the visualization of the phase transition process was made possible by the reversible thermochromic properties. In summary, the novel PTPCMs show tremendous application potential for efficient building energy conservation.

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Numerical simulation of the melting and solidification processes of two organic phase change materials in spherical enclosures for cold thermal energy storage applications

Cited by 21 publications

References 26 publications

Numerical prediction of the solidification and melting of encapsulated nano‐enhanced phase change materials

Numerical prediction of the solidification and melting of encapsulated nano‐enhanced phase change materials

Recent Advances in CFD Simulations of Multiphase Flow Processes with Phase Change

Flame-Retardant and Form-Stable Delignified Wood-Based Phase Change Composites with Superior Energy Storage Density and Reversible Thermochromic Properties for Visual Thermoregulation

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