Experimental and numerical study of annular PCM storage in the presence of natural convection

Longeon, Martin; Soupart, Adèle; Fourmigué, Jean-François; Bruch, Arnaud; Marty, Pascal

doi:10.1016/j.apenergy.2013.06.007

Cited by 297 publications

(105 citation statements)

References 18 publications

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“…The schematic diagram of the single-tube system studied by Longeon et al 21 is shown in Figure 1. The inner diameter of the single tube is 15 mm, the diameter of the shell is 40 mm, and the height of the system is 400 mm.…”

Section: Model Descriptionmentioning

confidence: 99%

“…The physical and thermal properties are given in Table 1. According to the previous studies of the thermal behavior of pure paraffin, [21][22][23] the specific heat of paraffin can be approximately considered as a function of temperature. Therefore, the total heat of fusion can be calculated through the variable specific heat; this technique enables solving the phase change problem precisely.…”

Section: Model Descriptionmentioning

confidence: 99%

“…In the study by Longeon et al, 21 paraffin RT35 and water were used as the PCM and HTF, respectively. The physical and thermal properties are given in Table 1.…”

Section: Model Descriptionmentioning

confidence: 99%

“…The reliability of the numerical model is verified using published experimental data. 21 Then, the heat flux across the tube is used to evaluate the heat transfer performance of the two systems. Moreover, the influence of HTF flow rate on the U-tube system is examined by six different cases, which are considered as laminar flow and turbulent flow, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Numerical investigation of dynamic melting process in a thermal energy storage system using U-tube heat exchanger

Xiong

Yong

Yang

2017

Advances in Mechanical Engineering

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A thermal energy storage system using U-tube heat exchanger is proposed and compared with the system using singletube heat exchanger. Based on the enthalpy-porosity method, three-dimensional numerical models using computational fluid dynamics approach are developed to simulate the dynamic melting of phase change material in the two systems. Variable specific heat technique and combined conduction-convection heat transfer models are applied to achieve precise simulation. The model is first validated using published data, and then, the heat flux across the tube is used to evaluate the heat transfer performance of the two systems. Moreover, parametric studies are performed to analyze the effect of heat transfer fluid flow rate on the U-tube system by six different cases. The results show that during the melting of phase change material, vertical temperature stratification occurs in both systems as a result of the intensified natural convection. The results also demonstrate that the U-tube system has better heat transfer performance than the singletube system which has the same heat transfer area and boundary conditions, reducing the total charging time by 25%. Increasing the heat transfer fluid flow rate greatly enhances the heat transfer performance for the U-tube system, but further enhancement is limited by the fixed heat transfer area. This study provides an effective method to investigate the thermal behavior of thermal energy storage using phase change materials, and the results can be helpful in optimizing the future thermal energy storage design and practical applications.

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Section: Model Descriptionmentioning

confidence: 99%

Section: Model Descriptionmentioning

confidence: 99%

“…In the study by Longeon et al, 21 paraffin RT35 and water were used as the PCM and HTF, respectively. The physical and thermal properties are given in Table 1.…”

Section: Model Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Numerical investigation of dynamic melting process in a thermal energy storage system using U-tube heat exchanger

Xiong

Yong

Yang

2017

Advances in Mechanical Engineering

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“…Longeon modeled with CFD simulations to explain the charge and discharge results. 6 Chaabane et al 7 have investigated numerically the thermal performance of an integrated collector for storage solar water heater using Fluent tool. Tan et al have finished a numerical research on the constrained melting of PCM inside a transparent spherical glass capsule using Fluent tool.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation on heat transfer characteristics of the storage tank for concentrating solar power plant

Mao

Zhang

2016

Advances in Mechanical Engineering

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Concentrating solar power plant coupling with energy storage is a new and emerging technology, which can solve two issues, that is, low flux density and intermittent of solar energy. Heat transfer characteristics of the storage tank in this system have a key effect on the system's efficiency and cost. In this article, the heat transfer performance of a phase change thermal storage tank has been proposed, and the temperature distribution and liquid fraction of phase change material in the tank has numerically been investigated. The results show that the temperature increases with the increasing charge time. The results also show that there is a phase change process at the charge time of 200 min, and no phase change for the charge time of 250 and 300 min. The results of this article can provide a reference for future design and optimal operation of the storage tank in concentrating solar power plant.

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A comprehensive review of heat transfer intensification methods for latent heat storage units

et al. 2020

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Latent heat thermal energy storage (LHTES) systems and their applications have been very substantive for the developments in energy science and engineering. The efficiency of LHTES systems largely depends on the thermal conductivity of the phase change materials (PCMs) and the heat transfer mechanisms in them. This review focuses on the methods employed to enhance heat transfer in LHTES systems which accordingly improve their storage performance. This includes the possible geometrical configurations of LHTES systems and the effects of their design parameters. The various methods adopted for enhancing LHTES systems' performance through either applying nanomaterials additives, using cascaded or encapsulated PCMs, or employing extended surfaces, such as fins, are discussed in detail. Additionally, various designs of PCM based heat exchangers with active and passive heat transfer techniques were highlighted. These systems are critically analyzed to help selecting reliable techniques and compatible materials for effective designs in order to achieve more efficient LHTES systems. This review would be helpful for the researchers to further develop heat transfer intensification mechanisms in LHTES systems.

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Experimental and numerical study of annular PCM storage in the presence of natural convection

Cited by 297 publications

References 18 publications

Numerical investigation of dynamic melting process in a thermal energy storage system using U-tube heat exchanger

Numerical investigation of dynamic melting process in a thermal energy storage system using U-tube heat exchanger

Numerical simulation on heat transfer characteristics of the storage tank for concentrating solar power plant

A comprehensive review of heat transfer intensification methods for latent heat storage units

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