Evaluation and optimization of thermal performance for a finned double tube latent heat thermal energy storage

Deng, Shengxiang; Nie, Changda; Jiang, Haojie; Ye, Wei‐Biao

doi:10.1016/j.ijheatmasstransfer.2018.10.126

Cited by 145 publications

(22 citation statements)

References 47 publications

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“…Deng et al [90] found that when the number of fins increased from 2 to 10, the melting time of PCM decreased by 63.3%. In Generally, the melting and/or solidification time of a PCM decreases with an increasing number and length of fins, which was reported by Deng et al [90,91] and Nie et al [92]. Deng et al [90] found that when the number of fins increased from 2 to 10, the melting time of PCM decreased by 63.3%.…”

Section: Double-tube Heat Exchangersmentioning

confidence: 72%

“…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. Generally, the melting and/or solidification time of a PCM decreases with an increasing number and length of fins, which was reported by Deng et al [90,91] and Nie et al [92]. Deng et al [90] found that when the number of fins increased from 2 to 10, the melting time of PCM decreased by 63.3%.…”

Section: Double-tube Heat Exchangersmentioning

confidence: 72%

“…Deng et al [90] found that when the number of fins increased from 2 to 10, the melting time of PCM decreased by 63.3%. In their second work, Deng et al [91] increased the dimensionless length of fins from 0.5 to 0.95 (dimensionless length of fins was defined as the ratio of the fin's length to the difference between the radius of the outer and inner tubes), the melting time of PCM decreased by 45.3%. Nie et al [92] showed that when the number of fins increased from 2 to 10, the time of the complete melting-solidification was reduced by 67.6%, whereas, when the dimensionless fins length (defined as the ratio of the fin length to the difference between the radius of the outer and inner tube) increased from 0.5 to 0.95, the melting-solidification time decreased by 50.6%.…”

Section: Double-tube Heat Exchangersmentioning

confidence: 99%

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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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Section: Double-tube Heat Exchangersmentioning

confidence: 72%

Section: Double-tube Heat Exchangersmentioning

confidence: 72%

Section: Double-tube Heat Exchangersmentioning

confidence: 99%

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

et al. 2020

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“…In double tube PCM storage, the PCMs are implemented around the tube and covered by a shell (Figure B). Metallic fins are then embedded into these PCMs to promote the heat transfer of HTF . The frequently used spherical capsule PCM storage units encapsulate PCMs into polyethylene balls and accumulate these balls in a cold‐water tank.…”

Section: Overview Of Integrating Pcms Into Air Conditioning Systemsmentioning

confidence: 99%

Improving the performance of air conditioning systems by using phase change materials: A review

Omara

Abuelnour

2019

Int J Energy Res

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Summary This paper reviews the application of phase change materials (PCMs) for improving the performance of air conditioning systems. The different methods of integrating PCMs into air conditioning systems are presented. Moreover, the effects of PCM geometry, flow, and heat transfer characteristics on the performance of air conditioning systems and the potential use of PCMs in increasing the energy savings and coefficient of performance of air conditioning systems are also discussed. Recent studies on the thermodynamic (energy and exergy), economic, and environmental benefits of integrating PCMs into air conditioning systems are reviewed. Several methods for the preparation and optimal selection of PCMs are proposed to improve the performance of air conditioning systems, and then the challenges relating to PCM properties, optimal thickness, and PCM containers are highlighted. The economic aspects, humidity effect, life cycle assessment, and use of solid‐solid PCMs are cited as potentially important topics for future research.

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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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Evaluation and optimization of thermal performance for a finned double tube latent heat thermal energy storage

Cited by 145 publications

References 47 publications

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

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

Improving the performance of air conditioning systems by using phase change materials: A review

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

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