Numerical study on the effect of the location of the phase change material in a concentric double pipe latent heat thermal energy storage unit

Mahdi, Mustafa S.; Mahood, Hameed B.; Hasan, Ahmed F.; Khadom, Anees A.; Campbell, Alasdair N.

doi:10.1016/j.tsep.2019.03.007

Cited by 63 publications

(18 citation statements)

References 32 publications

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“…Han et al [78] showed that the melting time of the PCM in the horizontal cylinder model DTHX was lower by 23.5% compared to the pipe model if the PCM mass and heat transfer surface area was equal in each case. A similar result was reported by Mahdi et al [79], who found that the melting time of the PCM was 43 and 18 min for pipe and cylinder model, respectively. However, solidification time was shorter in the pipe model (51 min) compared to the cylinder model (90 min).…”

Section: Double-tube Heat Exchangerssupporting

confidence: 89%

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 Exchangerssupporting

confidence: 89%

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

et al. 2020

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“…Mustafa et al studied the melting characteristics of paraffin wax in a conical helical coil latent thermal storage system under different operating conditions. The thermal performance of conical coil and the normal type helical coil was compared experimentally.…”

Section: Latent Heat Storagementioning

confidence: 99%

Review on solar thermal energy storage technologies and their geometrical configurations

Suresh

Saini

2020

Int J Energy Res

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Summary Because of the unstable and intermittent nature of solar energy availability, a thermal energy storage system is required to integrate with the collectors to store thermal energy and retrieve it whenever it is required. Thermal energy storage not only eliminates the discrepancy between energy supply and demand but also increases the performance and reliability of energy systems and plays a crucial role in energy conservation. Under this paper, different thermal energy storage methods, heat transfer enhancement techniques, storage materials, heat transfer fluids, and geometrical configurations are discussed. A comparative assessment of various thermal energy storage methods is also presented. Sensible heat storage involves storing thermal energy within the storage medium by increasing temperature without undergoing any phase transformation, whereas latent heat storage involves storing thermal energy within the material during the transition phase. Combined thermal energy storage is the novel approach to store thermal energy by combining both sensible and latent storage. Based on the literature review, it was found that most of the researchers carried out their work on sensible and latent storage systems with the different storage media and heat transfer fluids. Limited work on a combined sensible‐latent heat thermal energy storage system with different storage materials and heat transfer fluids was carried out so far. Further, combined sensible and latent heat storage systems are reported to have a promising approach, as it reduces the cost and increases the energy storage with a stabilized outflow of temperature from the system. The studies discussed and presented in this paper may be helpful to carry out further research in this area.

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“…Composites of PCM can be used to enhance the heat transfer process during phase change. The energy storage process can be even faster by increasing the convection heat transfer with selecting the appropriate geometry of heat exchange device 11–14 . Therefore, to improve the charging process, the PCM heat exchangers are used.…”

Section: Introductionmentioning

confidence: 99%

“…The axisymmetric model saves computational time and is considered to be effective due to symmetry in geometry and with a negligible circumferential gradient in the flow 19–21 . Mahdi et al compared the melting/solidification process with PCM in the annulus and central pipe, in a two dimensional domain 12 . Riahi et al investigated the solidification and melting processes in a PCM shell and tube heat exchanger 22 .…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on latent heat thermal energy storage in a phase change material using a heat exchanger

et al. 2021

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The use of a heat exchanger using phase change material (PCM) is an example of latent heat thermal energy storage (LHTES). In this study, the charging of PCM (RT50) is studied in a double pipe heat exchanger. The designing of the heat exchanger needs to be optimized for operating and boundary conditions to store latent heat efficiently. The size of the equipment and the amount of PCM are also important to calculate the latent heat storage capacity of the LHTES device. In this study, the amount of PCM taken is quite high to avoid sensible heat transfer and to maximize the heat content of PCM. The charging process of PCM is numerically simulated using an enthalpy‐porosity model. The study includes the effect of inlet temperature and flow rate of high‐temperature‐fluid (HTF) and concludes that both play an important role in determining the charging time. The continuous increase in inlet temperature of HTF can decrease the charging time of PCM in the heat exchanger. However, the continuous increase in the HTF flow rate cannot show the same effect. The charging time can only be minimized with a specified flow rate regime for a specific inlet temperature of HTF. These factors consequently affect the efficiency of the heat exchanger.

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Numerical study on the effect of the location of the phase change material in a concentric double pipe latent heat thermal energy storage unit

Cited by 63 publications

References 32 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

Review on solar thermal energy storage technologies and their geometrical configurations

Numerical investigation on latent heat thermal energy storage in a phase change material using a heat exchanger

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