Experimental and computational study of constrained melting of phase change materials (PCM) inside a spherical capsule

Tan, F.L.; Hosseinizadeh, S.F.; Khodadadi, J. M.; Fan, Li‐Wu

doi:10.1016/j.ijheatmasstransfer.2009.02.043

Cited by 390 publications

(114 citation statements)

References 26 publications

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“…Simulations have typically used the finite volume method or finite difference approximation, including both conduction and convection [17][18][19][20][21], typically with a constant temperature in the external surface of the capsule. The volume change has been typically considered in different forms, e.g., placed in an external reservoir [19,[22][23][24] or in contact with an external opening [25], and the effect of its initial position has been studied [26].…”

Section: Introductionmentioning

confidence: 99%

“…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: 99%

“…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%

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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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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2017

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“…Tan vd. küresel kapsül içerisindeki doğal taşınımlı faz değişim problemini FLUENT paket programı yardımıyla sayısal olarak incelemiş ve zamana bağlı ara-yüzey profili değişimlerini, gerçekleştirdikleri deneysel çalışmalar ile doğrulamışlardır [3]. Elde edilen sonuçlar ışığında, küre içerisinde iletim ve taşınımın baskın olduğu iki farklı ısı transfer bölgelerinin oluştuğu görülmüştür.…”

Section: Introductionunclassified

Si̇li̇ndi̇ri̇k Koordi̇natlarda Faz Deği̇şi̇mli̇ Isil Enerji̇ Depolama: Bi̇r Boyutlu Sayisal İnceleme

Özdoğan¹,

Ezan²,

Erek³

2016

deufmd

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ÖZBu çalışmada, boru-kovan tipi bir ısı değiştiricisi şeklinde tasarlanan faz değişimli gizli ısıl enerji depolama sistemi için bir-boyutlu matematiksel bir model oluşturulmuştur. Modelin doğruluğunu kontrol etmek için basitleştirilmiş analitik çözüm ile karşılaştırmalar gerçekleştirilmiştir. Değişen ısı transfer akışkanı sıcaklığı ve boru malzemeleri için zamana bağlı ara-yüzey ilerlemeleri ve yerel sıcaklık dağılımları elde edilmiştir. Sonuç olarak, PE-32 gibi düşük ısı iletim katsayısına sahip boru malzemelerinin kullanılması durumunda depolanan enerji miktarının önemli ölçüde azaldığı belirlenmiştir.

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“…They ascertained that the interface shape can be different according to the magnitude of the Rayleigh number due to the thermal instability and flow transition phenomenon when the Rayleigh number increases. Tan et al [3] examined the melting pattern of noctadecane inside a spherical capsule container through experiment and the numerical method. Recently, Lee et al [4] suggested that the effects of thermal conduction through the capsule wall and the convection of heat exchange fluid outside a capsule should be considered for proper estimation of the discharging performance of thermal storage tanks.…”

Section: Introductionmentioning

confidence: 99%

Restrictions on the analytic approach of unconstrained melting inside a spherical capsule

2015

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Analytic solutions are very important for providing physical insight and a basis for the examination of numerical and experimental results. However, analytic approaches are subject to extensive assumptions, so they cannot explain the complex phenomena involved with unconstrained melting. On the discharging conditions in real Thermal energy storage (TES) systems, such as capsule size, wall temperature and capsule materials, the assumptions used in the analytic solutions of unconstrained melting inside a spherical capsule are closely examined by comparing them with numerical solutions. Numerical approaches are more practical to implement all these complex behaviors, thus are used as the basis in the comparison after thorough validation. The restrictions on low Stefan number and low Rayleigh number of existing analytic solutions are addressed.

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Experimental and computational study of constrained melting of phase change materials (PCM) inside a spherical capsule

Cited by 390 publications

References 26 publications

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

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

Si̇li̇ndi̇ri̇k Koordi̇natlarda Faz Deği̇şi̇mli̇ Isil Enerji̇ Depolama: Bi̇r Boyutlu Sayisal İnceleme

Restrictions on the analytic approach of unconstrained melting inside a spherical capsule

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