Multi-layer PCM solidification in a finned triplex tube considering natural convection

Sefidan, Ali M.; Sojoudi, Atta; Saha, Suvash C.; Cholette, Michael E.

doi:10.1016/j.applthermaleng.2017.05.156

Cited by 59 publications

(5 citation statements)

References 34 publications

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“…The publication [52] shows that the specific heat value of 5 different substances tested by the authors takes higher values when PCM is in a liquid state. In addition, when PCM is in a specific state (either a liquid or a solid) the c p value is not constant but increases.…”

Section: Specific Heat and Latent Heat Of Mpcm Slurriesmentioning

confidence: 98%

“…The properties of slurries with PCM microcapsules are also described in [42][43][44], but a small number of measurements do not allow to draw clear conclusions regarding the effect of PCM microcapsules on the specific heat of slurry. A large part of the articles concerns the determination of the specific heat or the phase change heat of new PCM materials [45][46][47][48][49][50][51][52][53][54] that can be used as an additive to the working fluid to create another type of slurry/emulsion.…”

Section: Specific Heat and Heat Of Fusion Of Mpcm Slurry-a Previous S...mentioning

confidence: 99%

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Determining the Heat of Fusion and Specific Heat of Microencapsulated Phase Change Material Slurry by Thermal Delay Method

2020

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This paper details an experimental study that was performed to investigate the specific heat of microencapsulated phase change material (mPCM) slurry and its heat of fusion at the PCM phase change transition temperature. Six samples (mPCM slurry concentrate with the water solution of propylene glycol used as a main base liquid) were prepared. As the concentrate contains 43.0% mPCM, the actual mass fraction amounts to 8.6, 12.9, 17.2, 21.5, 25.8, and 30.1 wt%, respectively. The thermal delay method was used. Samples were cooled from 50 °C to 10 °C. A higher concentration of microcapsules caused a proportional increase in the specific heat of slurry at the main peak melting temperature. The maximum value of the specific heat changed from 9.2 to 33.7 kJ/kg for 8.6 wt%, and 30.1 wt%, respectively. The specific heat of the mPCM slurry is a constant quantity and depends on the concentration of the microcapsules. The specific heat of the slurry (PCM inside microcapsules in a liquid form) decreased from 4.0 to 3.8 kJ/(kgK) for 8.6 wt%, and 30.1 wt% of mPCM, respectively. The specific heat of the slurry (PCM inside microcapsules in a liquid form) was higher than when the PCM in the microcapsules is in the form of a solid and increased from 4.5 to 5.2 kJ/(kgK) for 8.6 wt% and 30.1 wt% of mPCM, respectively.

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Section: Specific Heat and Latent Heat Of Mpcm Slurriesmentioning

confidence: 98%

Section: Specific Heat and Heat Of Fusion Of Mpcm Slurry-a Previous S...mentioning

confidence: 99%

Determining the Heat of Fusion and Specific Heat of Microencapsulated Phase Change Material Slurry by Thermal Delay Method

2020

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“…(1) Two-dimensional fluid flow is employed as incompressible, laminar and unsteady, with simultaneous solidification and melting processes including free convection in the liquid phase; (2) To initially be solid, the temperature of the whole system was chosen to be lower than the melting temperature of each PCM at t = 0 s, and higher than those for initially liquid cases; (3) Thermo-physical properties of each PCM are assumed to be independent of temperature except the density in liquid phase; (4) The Boussinesq approximation is assumed for density variation in the liquid phase [20];…”

Section: Physical Model and Boundary Conditionsmentioning

confidence: 99%

“…They solved the energy equation to consider the convection mechanism in heat transfer fluid (HTF) and utilized the heat capacity method in order to evaluate the pure conduction phase change process within the PCMs. In a recent study, Sefidan et al [20] evaluated the influence of multi-layer PCM solidification, considering natural convection within a finned triplex tube using the two-dimensional finite volume technique in their numerical simulations. They also examined the effects of the thickness of each PCM layer as well as fin size.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Multi-Layer Phase Change Material in a Triplex Tube under Various Thermal Boundary Conditions

2022

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Nowadays, limited energy resources face ever-growing demands of the modern world. One engineering approach to mitigate this problem which has received considerable attention in recent years is using latent heat thermal storage (LHTS) systems, a significant opportunity which is provided by phase change materials (PCMs). In the present study, a numerical investigation was devoted to estimate the simultaneous freezing and melting processes of a double-layer PCM in terms of heat transfer and fluid flow phenomena. A double-pipe cylindrical channel with two compartments, A and B, was considered for locating two PCMs of RT28 and RT35 in various arrangements. The inner and outer walls were exposed to both hot and cold heat transfer fluids (HHTFs and CHTFs, respectively) beginning with solid or liquid initial state, which led to solid–liquid phase change process through PCMs. The numerical simulation was handled by a two-dimensional finite volume method (FVM) with a fixed Rayleigh number of 106 in which conduction and convection heat transfer mechanisms are taken into account. The effects of employing double-layer PCM and their arrangements, inner and outer walls’ boundary conditions, and initial statuses of PCMs are discussed, and the details of the compared results are shown in the form of temperature and liquid fraction variations over time.

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“…Several authors have embedded longitudinal fins around the HTF for enhancement in the charging and discharging process. Several authors have evaluated the thermal performance of different latent heat storage systems using rectangular fins 47‐67 . A few authors have also investigated the charging and discharging performance of the PCM using triangular/branched (tree/Y‐shaped) fins 57,68‐73 .…”

Section: Introductionmentioning

confidence: 99%

Enrichment of heat transfer in a latent heat storage unit using longitudinal fins

et al. 2020

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The charging and discharging rates of a phase change material (PCM) in a horizontal latent heat storage unit (LHSU) is largely influenced by the lower thermal conductivity of the PCM. In the present research, four different configurations of longitudinal fins are proposed to augment the heat transfer in horizontal shell and tube type LHSUs. Numerical investigations are reported to establish the thermal performance augmentation with rectangular, triangular, and Y‐shaped (bifurcated) fins. From the results, it has been inferred that all fin configurations provide a faster charging and discharging rate. In the present set of geometric dimensions of LHSU considered, a reduction in charging time of 68.71% is evaluated for case III (three rectangular fins with one fin positioned in the area of the heat transfer fluid [HTF] surface) and case V (two bifurcated fins with one fin positioned in the area of the HTF surface). Moreover, overall cycle (charging + discharging) time is reduced by 58.3% for case III. Employment of fins results in a faster rate of absorption and extraction of energy from the PCM.

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Multi-layer PCM solidification in a finned triplex tube considering natural convection

Cited by 59 publications

References 34 publications

Determining the Heat of Fusion and Specific Heat of Microencapsulated Phase Change Material Slurry by Thermal Delay Method

Determining the Heat of Fusion and Specific Heat of Microencapsulated Phase Change Material Slurry by Thermal Delay Method

Modeling of Multi-Layer Phase Change Material in a Triplex Tube under Various Thermal Boundary Conditions

Enrichment of heat transfer in a latent heat storage unit using longitudinal fins

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