Solidification of additive-enhanced phase change materials in spherical enclosures with convective cooling

Temirel, Mikail; Hu, Hai‐Jie; Shabgard, Hamidreza; Boettcher, Philipp; McCarthy, Matthew; Sun, Ying

doi:10.1016/j.applthermaleng.2016.09.090

Cited by 34 publications

(18 citation statements)

References 40 publications

(48 reference statements)

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“…The outdoor night cooling method is only intended for the peak shifting and decreasing of the daytime temperatures. As an alternative method of getting out the TES during the night, some experts use the fan to increase the heat exchange between co_oil and air [12][13][14][15][16]31]. .…”

Section: Thermal Characteristics and Heat Exchange Performance Of Co_mentioning

confidence: 99%

“…Weather conditions of day and night are not always the same, so that loads of cooling and heating are not always balanced. The solidification process becomes an important aspect in which the role of PCM cell size and solidification agent are important, so that solidification activation, such as dew point convective cooling, will be useful [31].…”

Section: Introductionmentioning

confidence: 99%

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Potential of Thermal Energy Storage Using Coconut Oil for Air Temperature Control

et al. 2018

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The role of thermal mass in indoor air-cooling during the day is a common area of study, which is particularly relevant for an era characterized by energy crises. Thermal energy storage (TES) technologies for application in rooms and buildings are not well developed. This study focuses on the use of coconut oil (co_oil) as a temperature control agent for room air conditioning systems in tropical countries such as Indonesia, given its capability to store large amounts of heat at temperatures around its melting point. Heat exchange studies between co_oil and the air environment were performed by considering three factors: Temperature difference between co_oil and the air environment, the heat absorption behavior and the release of co_oil, and the mass of co_oil required to have a significant effect. The co_oil cell sizes were formulated as responses to natural day and night air temperature profiles, while the performance of the co_oil mass for decreasing room air temperature was predicted using a thermal chamber.

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Section: Thermal Characteristics and Heat Exchange Performance Of Co_mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Potential of Thermal Energy Storage Using Coconut Oil for Air Temperature Control

et al. 2018

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“…The mechanical stress in the capsule provoked by the different density has been also considered, although no volume change is considered in this case [29,30]. Experimental studies, on the other hand, have used transparent capsules to monitor the solid fraction of PCM [19,25,31,32], as well as temperature probes in different positions within the capsule [18,33,34]. The results typically show good agreement between simulations and experiments [20,[35][36][37], albeit in ideal conditions.…”

Section: Introductionmentioning

confidence: 72%

“…The results typically show good agreement between simulations and experiments [20,[35][36][37], albeit in ideal conditions. However, these studies consider a capsule in a thermostated fluid, either at flowing [22,26,34] or (almost) at rest [18,19].…”

Section: Introductionmentioning

confidence: 99%

Simulations of Melting of Encapsulated CaCl2·6H2O for Thermal Energy Storage Technologies

et al. 2017

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Abstract:We present in this work simulations using the finite difference approximation in 2D for the melting of an encapsulated phase-change material suitable for heat storage applications; in particular, we study CaCl 2 ·6H 2 O in a cylindrical encapsulation of internal radius 8 mm. We choose this particular salt hydrate due to its availability and economic feasibility in high thermal mass building walls or storage. Considering only heat conduction, a thermostat is placed far from the capsule, providing heat for the melting of the phase-change material (PCM), which is initially frozen in a water bath. The difference in density between the solid and liquid phases is taken into account by considering a void in the solid PCM. A simple theoretical model is also presented, based on solving the heat equation in the steady state. The kinetics of melting is monitored by the total solid fraction and temperatures in the inner and outer surfaces of the capsule. The effect of different parameters is presented (thermostat temperature, capsule thickness, capsule conductivity and natural convection in the bath), showing the potential application of the method to select materials or geometries of the capsule.

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“…Molecular simulation [12][13][14][15] has gained wide application in the research of material properties in recent years with the fast advancement of computer technology. Molecular dynamics (MD) is an indispensable computational tool for studying the microstructure and surface morphological evolution of coatings and thin films upon varying incident flux compositions [16,17] and energies [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Molecular Simulations of Sputtering Preparation and Transformation of Surface Properties of Au/Cu Alloy Coatings Under Different Incident Energies

Zhang

Tian

Peng

2019

Metals

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The surface properties of coatings during deposition are strongly influenced by temperature, particle fluxes, and compositions. In addition, the precursor incident energy also affects the surface properties of coatings during sputtering. The atomistic processes associated with the microstructure of coatings and the surface morphological evolution during sputtering are difficult to observe. Thus, in the present study, molecular dynamics simulation was employed to investigate the surface properties of Au/Cu alloy coatings (Cu substrate sputtering by Au atoms) with different incident energies (0.15 eV, 0.3 eV, 0.6 eV). Subsequently, the sputtering depth of the Au atoms, the particle distribution of the Au/Cu alloy coating system, the radial distribution function of particles in the coatings, the mean square displacement of the Cu atoms in the substrate, and the roughness of the coatings were analyzed. Results showed that the crystal structure and the sputtering depth of Au atoms were hardly influenced by the incident energy, and the incident energy had little impact on the motion of deep-lying atoms in the substrate. However, higher incident energy resulted in higher surface temperature of coatings, and more Au atoms existed in the coherent interface. Moreover, it strengthened the motion of Cu atoms and reduced the surface roughness. Therefore, the crystal structure of coatings and the motions of deep-lying atoms in the substrate are not influenced by the incident energy. However, the increase in incident energy will enhance the combination of coatings and the base while optimizing the surface structure.

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Solidification of additive-enhanced phase change materials in spherical enclosures with convective cooling

Cited by 34 publications

References 40 publications

Potential of Thermal Energy Storage Using Coconut Oil for Air Temperature Control

Potential of Thermal Energy Storage Using Coconut Oil for Air Temperature Control

Simulations of Melting of Encapsulated CaCl2·6H2O for Thermal Energy Storage Technologies

Molecular Simulations of Sputtering Preparation and Transformation of Surface Properties of Au/Cu Alloy Coatings Under Different Incident Energies

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