An optimization study of solidification procedure in a wavy- wall storage unit considering the impacts of NEPCM and curved fin

Alizadeh, M.; Nabizadeh, Ali; Fazlollahtabar, Amin; Ganji, D.D.

doi:10.1016/j.icheatmasstransfer.2021.105249

Cited by 43 publications

(6 citation statements)

References 28 publications

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“…The results indicated that the average heat transmission rate for the wavy channel composite PCM case is 10.4 and 18.9 times that for the smooth channel pure PCM case during the melting and solidification processes, respectively. Alizadeh et al 36 established a numerical approach for modeling and optimizing the solidification process in a Latent Heat TES System composed of a wavy shell and a fin-assisted tube. Rotating cylinders may be utilized to control convection inside a cavity in a variety of heat transfer applications.…”

mentioning

confidence: 99%

Melting enhancement of PCM in a finned tube latent heat thermal energy storage

Ahmed

Abderrahmane

Saeed

et al. 2022

Sci Rep

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The current paper discusses the numerical simulation results of the NePCM melting process inside an annulus thermal storage system. The TES system consists of a wavy shell wall and a cylindrical tube equipped with three fins. The enthalpy-porosity method was utilized to address the transient behavior of the melting process, while the Galerkin FE technique was used to solve the system governing equations. The results were displayed for different inner tube positions (right-left–up and down), inner cylinder rotation angle (0 ≤ α ≤ 3π/2), and the nano-additives concentration (0 ≤ ϕ ≤ 0.04). The findings indicated that high values of nano-additives concentration (0.4), bigger values of tube rotation angle (3π/2), and location of the tube at the lower position accelerated the NePCM melting process.

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confidence: 99%

Melting enhancement of PCM in a finned tube latent heat thermal energy storage

Ahmed

Abderrahmane

Saeed

et al. 2022

Sci Rep

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“…Alizadeh et.al. [88] studied the single-walled carbon nanotubes(SWCNT) to remedy the shortcoming of low thermal conductivity of PCMs which increases the undesirable solidification time. They used 4% SWCNT-enhanced PCM in LHTESS and reported that there is a reduction time of 61.54% in full solidification time(FST) when compared to the pure PCM.…”

Section: Nanoconfinement Of Organic Pcmsmentioning

confidence: 99%

Recent advances in phase change materials for thermal energy storage-a review

Venkateswarlu¹,

Konijeti

2021

J Braz. Soc. Mech. Sci. Eng.

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The research on phase change materials (PCMs) for thermal energy storage systems has been gaining momentum in a quest to identify better materials with low-cost, ease of availability, improved thermal and chemical stabilities and eco-friendly nature. The present article comprehensively reviews the novel PCMs and their synthesis and characterization techniques for improving the properties and long-term storage capabilities. They include eco-friendly PCMs based on wood and tree fruit oils, microPCMs, nanoconfinement of organic PCMs, metal organic PCMs, bio-based PCMs, metal organic framework (MOF) PCMs and form-stable PCMs with gelators. The novel approaches such as cryogenically treated microencapsulated PCMs and treating them with photo-switching dopants to improve the properties are also presented. This review provides the useful insights about recent advances in the field of PCMs. The phase change slurries can effectively improve the thermal performance of photovoltaic/thermal systems. The thermal conductivity of PCMs can be enhanced significantly by PCM slurries, MOFs, exfoliated graphite nanoplatelets and composite PCMs. Optical control of PCMs by doping them with azobenzene dopants is found to be the most promising technique to improve the thermal stability and long-term storage capacity of PCMs. Cyclic cryogenic treatment by liquid nitrogen followed by heat treatment of PCMs can improve the latent heat, thermal and chemical stabilities significantly. The insightful information presented in this article can serve as an important tool for the researchers in the field of PCMs research to further innovate the technology in different applications such as thermal management of buildings, solar energy storage and cryogenic storage etc.

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“…The results show that the use of optimized curved fin can significantly reduce the melting time by 57.4%. Alizadeh et al [36] equipped the PCES unit with curved fin to study its effect on solidification time. The result demonstrated that the solidification time of curved fin equipped PCES unit reduces by 45.28% in comparison to PCES unit with no fin.…”

Section: Introductionmentioning

confidence: 99%

“…The result demonstrated that the solidification time of curved fin equipped PCES unit reduces by 45.28% in comparison to PCES unit with no fin. In addition to the curved fin, Alizadeh et al [36] introduced a curved waveshaped wall as the enclosure for the PCES unit, yielding favorable outcomes. The use of wave-shaped walls to increase surface area in storage units has also been investigated in several literatures due to its potential to expand the available surface area [37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Optimizing solidification process in phase change energy storage units with sinusoidal wave-shaped fins

Kumar,

Maurya

2023

Eng. Res. Express

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Phase change energy storage units have attracted considerable interest in the field of energy storage technology. To overcome the challenge of low thermal conductivity associated with phase change material (PCM) employed in these units, researchers have implemented fins with various shapes. In this study, a two-dimensional numerical model of a phase change energy storage unit with newly designed sinusoidal wave-shaped fins is developed. The analysis is done using commercial software ANSYS-Fluent in the transient state. The solidification process of the PCM is evaluated with enthalpy–porosity method. The validation of the model is done against an experimental result from a published article. The study focused on increasing the surface area of sinusoidal wave-shaped fins, achieved by increasing its crests and troughs counts, and to analyse its impact on the solidification process of the PCM. The thermal performances are evaluated quantitatively by analysing the solidified portion of PCM, temperature distribution, rate of heat release, and velocity variation. The result shows that the total solidification time predicted for straight fin is 115.34 minutes. This duration reduces for wave-shaped fins, and it reduces even further as the crests and troughs counts of wave-shaped fins increases. The maximum reduction in total solidification time is observed as 19.93% for wave-shaped fin with 10 crests and troughs counts. It is also observed that rate of reduction in total solidification time initially decreases then marginally increases with the increase in crests or troughs counts. The effect of buoyancy on the PCM flow velocity is analysed at different locations within the phase change energy storage unit. It is observed that with the increase in crests and troughs counts the movement of PCM near the crest or trough decreases.

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An optimization study of solidification procedure in a wavy- wall storage unit considering the impacts of NEPCM and curved fin

Cited by 43 publications

References 28 publications

Melting enhancement of PCM in a finned tube latent heat thermal energy storage

Melting enhancement of PCM in a finned tube latent heat thermal energy storage

Recent advances in phase change materials for thermal energy storage-a review

Optimizing solidification process in phase change energy storage units with sinusoidal wave-shaped fins

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