Effects of fins arrangement and parameters on the consecutive melting and solidification of PCM in a latent heat storage unit

Nie, Changda; Deng, Shengxiang; Liu, Jiangwei

doi:10.1016/j.est.2020.101319

Cited by 70 publications

(23 citation statements)

References 39 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%

“…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: 73%

“…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%. However, it should be noted that as the number or length of fins increases, the share of sensible heat stored in fins is growing, but less PCM can be placed in an HX.…”

Section: Double-tube Heat Exchangersmentioning

confidence: 99%

“…As mentioned in Section 2, melting is a convection-dominated process, and PCM begins to melt at the top of an HX. Therefore, to reduce the melting time, fins should be gathered in the lower part of an HX rather than in the upper part [90][91][92]94]. When circular fins are applied into a vertically oriented HX, it is advisable to reduce the distance between adjacent fins in arithmetic progression from top to bottom, which can reduce PCM melting time by 49.9% [94].…”

Section: Double-tube Heat Exchangersmentioning

confidence: 99%

“…Therefore, it was concluded that the bottom fins arrangement was the most advantageous. On the other hand, Nie et al [92] found that although locating fins in the lower part of a DTHX reduces the melting time, it slows down the solidification process. Therefore, to achieve complete melting-solidification time possibly short, the fins should be distributed equally around the tube circumference.…”

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: 73%

Section: Double-tube Heat Exchangersmentioning

confidence: 73%

Section: Double-tube Heat Exchangersmentioning

confidence: 99%

Section: Double-tube Heat Exchangersmentioning

confidence: 99%

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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Numerical investigation on melting and energy storage density enhancement of phase change material in a horizontal cylindrical container

Senthil

Punniakodi

Balasubramanian

et al. 2022

Intl J of Energy Research

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Summary Thermal energy storage (TES) plays a significant role in storing heat energy during the availability of a source. The phase change material (PCM) storage density is high, but its meager thermal conductivity leads to ineffective heat transfer. This mathematical modeling work simulates two different heat transfer tube (HTT) arrangements in a horizontal cylindrical container to melt the PCM using the enthalpy‐porosity method. Case‐1 with a single HTT at the centroidal axis and Case‐2 with multiple tubes spread radially. Cases‐1 and 2 are observed with melting and solidification duration of 39.8 and 184 minutes, and 69.83 and 292.5 minutes respectively. Case‐1 has a shorter melting and solidification time because of the optimal HTT location. Case‐2 is observed with a high heat storage density of 224.95 MJ/m3, compared to Case‐1 with 224.571 MJ/m3. Nusselt number is higher for Case‐2 (385.86) during charging and higher for Case‐1 (208) during discharging. Nusselt number initially varies for both cases due to effective heat convection at the start; however, Case‐1 has a shorter melting duration with its energy density lower than the Case‐2. Based on the obtained results, it could be suggested that Case‐1 could be applicable when simultaneous heat transfer requires less energy storage and a faster melting rate, while Case‐2 could be used in places that demand a higher storage density.

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Review on thermal performance of heat exchanger using phase change material

Das

Kar

Sarangi

2022

Intl J of Energy Research

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This article reports detailed investigation of using different Phase Change Materials (PCM) in various designs of Thermal Energy Storage (TES) Devices: specifically, heat exchanger. The focus is on the performance analysis of different types of heat exchangers acting as TES having various PCMs which are substantially reviewed in this paper. The study highlights the difference in their geometry and performance output. Further, the importance of different performance enhancement methods with parametric study of different heat exchangers using PCM is described. From the detailed investigation, finally, it is realised that the different factors such as no. of outer tubes, no. of inner tubes, tube material selected, type of PCM, provision of an extended surface, use of different metal foams and nanoparticles, various types of composites, charging and discharging characteristics and packed and cascaded units are different heat transfer enhancement methods to improve the heat transfer. A novel kind of heat exchanger known as Webbed tube heat exchanger using PCM is discussed for an efficient TES unit. Further, a review of quantitative analysis of melting time, solidification time, charging and discharging time is discussed.

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Effects of fins arrangement and parameters on the consecutive melting and solidification of PCM in a latent heat storage unit

Cited by 70 publications

References 39 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

Numerical investigation on melting and energy storage density enhancement of phase change material in a horizontal cylindrical container

Review on thermal performance of heat exchanger using phase change material

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