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

Ahmed, Sameh E.; Abderrahmane, Aissa; Saeed, Abdulkafi Mohammed; Mourad, Abed; Younes, Obai; Botmart, Thongchai

doi:10.1038/s41598-022-15797-0

Cited by 17 publications

(7 citation statements)

References 47 publications

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“…The simplest one is, of course, increasing the heat transfer surface. This is achieved, for example, by the use of extended surfaces, and finned surfaces, e.g., [4,5]. Another way is to use inserts immersed in PCM with a large surface area and high thermal conductivity, such as carbon brushes [6,7], metal foams [8,9], porous materials [10][11][12], metal rings [13,14], or metal matrices [15,16].…”

Section: Introductionmentioning

confidence: 99%

Thermal Energy Storage with PCMs in Shell-and-Tube Units: A Review

Cieśliński

Fabrykiewicz

2023

Energies

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The paper presents a survey of the experimental and numerical studies of shell-and-tube systems in which phase change material (PCM) is used. Due to the multitude of design solutions for shell-and-tube systems, the emphasis is placed on double-tube (DT), triplex-tube (TT), and multi-tube (MT) units. Additionally, only single-pass systems are considered. Particular attention is paid to the method of heat transfer intensification. The analysis of the research results begins with the classification of each of the three mentioned systems. The systems are divided according to the angle of inclination, the method of heat transfer enhancement (HTE), the flow direction of heat transfer fluid (HTF), and the arrangement of tubes in the bundle. Moreover, the simplified schemes of the particular research cases are proposed. Then, the works on each of the mentioned systems, i.e., DT, TT, and MT, are discussed chronologically. Finally, in the corresponding tables, details of the discussed cases are presented, such as geometric dimensions, and the type of PCM or HTF used. A novelty in the present work is the precise classification of PCM TESUs as DT, TTH, and MTH. In the literature, there is a lot of discretion in this regard. Second, the methods of heat transfer intensification in the presented PCM TESUs are listed and discussed. Third, unified schemes of design solutions for the discussed PCM TESUs are proposed. The review shows that development directions for shell-and-tube TESUs include systems with high conductivity fins of different shapes, heights, and spacing, several PCMs, and modified shells.

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Section: Introductionmentioning

confidence: 99%

Thermal Energy Storage with PCMs in Shell-and-Tube Units: A Review

Cieśliński

Fabrykiewicz

2023

Energies

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“…Ma et al (2020) studied the effects of nanoparticles dispersed into paraffin wax, showing that nanoparticle application enhances the solidification procedure and diminishes entropy formation. Ahmed et al (2022) investigated different geometry modifications and nanoparticle addition techniques in a PCM container during melting. They performed a numerical simulation on a wavy circular cylinder containing nano-additives and showed that the melting rate augments with increasing nanoparticle concentration.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer enhancement and free convection assessment in a double-tube latent heat storage unit equipped with optimally spaced circular fins: Evaluation of the melting process

et al. 2023

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To overcome the weak conduction heat transfer of phase change materials (PCM), this investigation aimed to assess the behavior of a double-tube latent heat storage unit with circular fins through the charging process. The influence of free convection in the presence of fins of various arrangements and sizes was comprehensively studied. The geometrical characteristics of the fins, i.e., their size and number, were assessed to optimize their performance. Moreover, a sensitivity assessment was performed on the characteristics of the heat transfer fluid passing through the inner tube, i.e., the Reynolds number and temperature. Charging time diminished by 179% when nine 15 mm fins were added compared with the finless scenario, assuming the same phase change materials volume. Moreover, the system’s thermal recovery rate improved from 20.5 to 32.9 W when nine fins with the heigth of 15 mm were added. The use of more fins improved the thermal behavior of the phase change materials because of the higher total fin area. The melting time and heat storage rate changed by 76% and 71%, respectively, for the system with 19 fins compared with those with four fins. Moreover, the outcomes indicated that a higher heat storage rate can be achieved when the working medium’s faster flow and inlet temperature were used.

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“…The current research focus is on improving the thermal conductivity of PCMs and strengthening their heat transfer capacity. The commonly used methods include adopting fin-tubes [2,3] and PCM microcapsules [4,5], adding metal rings and graphite [6,7], filling PCM into porous matrixes such as metal foams [8][9][10], and so on.…”

Section: Introductionmentioning

confidence: 99%

Influence of Copper Foam on the Thermal Characteristics of Phase Change Materials

et al. 2023

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The phase change material is a hot research topic in solar thermal storage systems. However, the thermal conductivity of pure phase change materials is usually low, which hinders its application in facilities. In this study, copper foam is used to increase the thermal characteristics of the paraffin. Simulations are conducted to compare the melting characteristics of the pure paraffin and the paraffin/copper foam composite phase change material. A visualized experimental device was designed and built, and the copper foam composite phase change material, with a volume fraction of 15%, was prepared by filling part of the copper foam in the phase change material. The simulation results agree well with the experimental results. The root mean square errors of the temperature for the pure paraffin and the composite phase change material are 0.0223 and 0.0179, respectively. The experimental results show that the copper foam can enhance thermal conductivity and decrease melting time. It takes 870 s for the composite phase change material to melt, which is 3.44% less than that of the pure paraffin. This study deepens the understanding of the composite phase change material and provides a reference for the design of thermal energy storage devices.

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

Cited by 17 publications

References 47 publications

Thermal Energy Storage with PCMs in Shell-and-Tube Units: A Review

Thermal Energy Storage with PCMs in Shell-and-Tube Units: A Review

Heat transfer enhancement and free convection assessment in a double-tube latent heat storage unit equipped with optimally spaced circular fins: Evaluation of the melting process

Influence of Copper Foam on the Thermal Characteristics of Phase Change Materials

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