Numerical study and experimental validation of the effects of orientation and configuration on melting in a latent heat thermal storage unit

Mahdi, Mustafa S.; Hasan, Ahmed F.; Mahood, Hameed B.; Campbell, Alasdair N.; Khadom, Anees A.; Karim, Abdul Mun’em A.; Sharif, Adel O.

doi:10.1016/j.est.2019.04.013

Cited by 97 publications

(10 citation statements)

References 46 publications

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“…The validation process is considered one of the most important steps in any numerical simulation, it can provide a kind of certainty and reliability of any model that can be utilized in any parametric study that needs to be conducted in the future (Mahdi et al 2019). Therefore, in the current study, the variation of the Reynolds number versus the wall shear stress without Nano fluid was validated against [12] as shown in Figure3.…”

Section: Resultsmentioning

confidence: 99%

Numerical Investigation of Heat Transfer Rate in Helically Coiled Pipe Using Al2O3/Water Nanofluid

Hasan

2020

DJES

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Nanofluid materials play an important role in the industry nowadays, which has drawn the attention of researchers to enhance the characteristics of the heat transfer of the fluids in the coiled shape heat exchangers. The effect of using Al2O3/water Nano fluid on the characteristic of the heat transfer rate inside the helically coiled pipe was numerically studied at different Reynolds numbers. Moreover, fluid flow analyses were investigated numerically in terms of pressure and velocity profile. The heat transfer enhancement using this Nano fluid has been studied and then compared to pure water at Reynolds number values of 200, 600, and 1500 respectively. The results showed that a reduction in the temperature of the outer wall pipe when Al2O3/water Nano fluid was applied particularly at a low Reynolds number compared to pure water. Generally speaking, it has been seen that the reduction in the temperature profile is much better than the high Reynolds number.

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Section: Resultsmentioning

confidence: 99%

Numerical Investigation of Heat Transfer Rate in Helically Coiled Pipe Using Al2O3/Water Nanofluid

Hasan

2020

DJES

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“…However, Scharinger-Urschitz et al [88] reported that when the longitudinal and circular fins were used simultaneously, the melting was faster by 32% compared to HX with only longitudinal fins. Nevertheless, the application of longitudinal fins can reduce the melting time of PCM by 50% compared to the non-finned HX [89]. A possible explanation for better performance of longitudinal fins than circular fins could be that the circular fins augment the heat transfer only in the regions near the fins and in the radial direction, whereas, the longitudinal fins augment the heat transfer in both radial and axial directions.…”

Section: Double-tube Heat Exchangersmentioning

confidence: 99%

The Impact of Heat Exchangers’ Constructions on the Melting and Solidification Time of Phase Change Materials

et al. 2020

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An application of latent heat thermal energy storage systems with phase change materials seems to be unavoidable in the present world. The latent heat thermal energy storage systems allow for storing excessive heat during low demand and then releasing it during peak demand. However, a phase change material is only one of the components of a latent heat thermal energy storage system. The second part of the latent heat thermal energy storage is a heat exchanger that allows heat transfer between a heat transfer fluid and a phase change material. Thus, the main aim of this review paper is to present and systematize knowledge about the heat exchangers used in the latent heat thermal energy storage systems. Furthermore, the operating parameters influencing the phase change time of phase change materials in the heat exchangers, and the possibilities of accelerating the phase change are discussed. Based on the literature reviewed, it is found that the phase change time of phase change materials in the heat exchangers can be reduced by changing the geometrical parameters of heat exchangers or by using fins, metal foams, heat pipes, and multiple phase change materials. To decrease the phase change material’s phase change time in the tubular heat exchangers it is recommended to increase the number of tubes keeping the phase change material’s mass constant. In the case of tanks filled with spherical phase change material’s capsules, the capsules’ diameter should be reduced to shorten the phase change time. However, it is found that some changes in the constructions of heat exchangers reduce the melting time of the phase change materials, but they increase the solidification time.

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“…The effect of natural convection on the heat transfer characteristics of phase change materials was studied by temperature regulation. Mahdi et al [12] took industrial paraffin as phase change material and studied the melting behavior of paraffin in different tubular and shell latent heat accumulators through visualization experiments. Reyes et al [13] conducted visualization experiments with emulsions with different volume fractions of paraffin to study the feasibility of replacing part of paraffin with water as phase change materials.…”

Section: Introductionmentioning

confidence: 99%

Division of paraffin melting zone based on multiscale experiments

Liu

TianYu

et al. 2022

Therm sci

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Phase change energy storage materials are widely used in the field of renewable energy. Paraffin is one of the common phase change energy storage materials. As a multi-component hydrocarbon mixture, the melting of paraffin is different from that of pure substance. In addition to the solid and liquid zones, there is also a fuzzy zone in which solid and liquid coexist. In this paper, the melting characteristics of paraffin in phase transition zone are studied by multi-scale experiments. Through the visualization experiment of square cavity paraffin melting, the solid zone, fuzzy zone and liquid zone are determined, and the moving process of phase interface is tracked by digital pictures and infrared heat maps. The evolution process of the pore structure in the fuzzy zone under different temperatures is photographed by means of the micro experiment, and it is revealed that there are two areas in the fuzzy zone, porous media area and multiphase flow area. The results show that the melting process of paraffin can be divided into four zones: liquid zone, multiphase flow zone, porous media zone and solid phase zone. According to the polarizing optical microscopy (POM) picture, the continuous phase and discrete phase transition relationship between solid wax crystal and liquid paraffin is captured. The POM picture is statistically analyzed, and the critical liquid phase ratio of the transition from porous media area to multiphase flow area is given under experimental conditions.

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Numerical study and experimental validation of the effects of orientation and configuration on melting in a latent heat thermal storage unit

Cited by 97 publications

References 46 publications

Numerical Investigation of Heat Transfer Rate in Helically Coiled Pipe Using Al2O3/Water Nanofluid

Numerical Investigation of Heat Transfer Rate in Helically Coiled Pipe Using Al2O3/Water Nanofluid

The Impact of Heat Exchangers’ Constructions on the Melting and Solidification Time of Phase Change Materials

Division of paraffin melting zone based on multiscale experiments

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