Improving the melting performance of a horizontal shell-tube latent-heat thermal energy storage unit using local enhanced finned tube

Deng, Shengxiang; Nie, Changda; Wei, Guangya; Ye, Wei‐Biao

doi:10.1016/j.enbuild.2018.11.018

Cited by 154 publications

(34 citation statements)

References 48 publications

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“…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: 73%

“…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%. 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].…”

Section: Double-tube Heat Exchangersmentioning

confidence: 73%

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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: 73%

Section: Double-tube Heat Exchangersmentioning

confidence: 73%

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

et al. 2020

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“…The present study aims to maximize the energy discharging and charging efficiency of a finned LHS unit with consideration of natural convection. Previous studies have indicated that the axial temperature gradient is far less than that in the radial direction for horizontal shell‐and‐tube LHS units. Therefore, the melting and solidification heat transfer in the three‐dimensional LHS unit can be simplified into a two‐dimensional model.…”

Section: Mathematical Modelsmentioning

confidence: 95%

Role of tree‐shaped fins in charging performance of a latent heat storage unit

Huang

Zhang

et al. 2020

Int J Energy Res

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Summary The performance enhancement of latent heat storage (LHS) units is of great consequence for the development of sustainable energy. In this article, the transient models of phase‐change heat transfer processes in LHS units with consideration of natural convection are developed and numerically analyzed, in an effort to explore the role of the fractal tree‐shaped fin in the energy charging performance. The solid‐liquid interface evolution and dynamic temperature response in the tree‐shaped finned LHS unit are presented and compared with the wheel‐shaped one. Moreover, the influence of the fin number is investigated for maximizing the energy charging performance. The results indicate that the tree‐shaped fin has merits of effective layout optimization for the point‐to‐area heat transfer and the time‐coordination of energy charging and discharging process. Compared with the wheel‐shaped fin, the melting duration time is decreased only a little for the presence of tree‐shaped fin, however, the solidification process is decreased significantly. The presence of tree‐shaped fin leads to a lower energy charging rate during the early and middle stages of the charging process due to the natural convection suppression, however, the energy charging rate is faster during the later stage due to the thermal conduction dominated interior heat transfer. For maximizing the melting performance, the appropriate fin number in practical applications is 16.

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“…The water exchanges heat directly with the balls, and then the PCMs freeze and melt from the outer sphere to the inner sphere (Figure C) . Shell and tube PCM storage units are usually fabricated as cylindrical or rectangular containers that comprise horizontal or vertical parallel curved pipes submerged in quiescent PCM with the HTF flowing through the pipes (Figure D) …”

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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Improving the melting performance of a horizontal shell-tube latent-heat thermal energy storage unit using local enhanced finned tube

Cited by 154 publications

References 48 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

Role of tree‐shaped fins in charging performance of a latent heat storage unit

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

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