Thermal performance analysis and optimization of a double-layer spherical phase-change material capsule with annular fins

Sun, Baizhong; Sun, Mingjun; Gao, Long; Che, Deyong; Deng, Yimin

doi:10.1016/j.est.2022.106280

Cited by 9 publications

(4 citation statements)

References 31 publications

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“…Additionally, SOC DOI: 10.1002/adts.202300302 estimation is being done using a growing amount of data-driven methodologies. [10][11][12][13] As two methods of SOC estimation that are based on a model, the unscented Kalman filter (UKF) [14,15] and particle filter (PF) [16,17] offer the benefits of reduced memory consumption and fast operation.…”

Section: Introductionmentioning

confidence: 99%

An Initial Value Problem for State of Charge Estimation of Lithium‐Ion Batteries with an Adaptive Fractional‐Order Unscented Particle Filter

Jiao,

Gao,

Chai

et al. 2023

Advcd Theory and Sims

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This paper proposes an adaptive fractional‐order unscented particle filter (AFOUPF) with the initial value compensation (IVC) to enhance the estimation accuracy of the state of charge (SOC) for lithium‐ion batteries (LIBs). First, to correctly reflect the dynamic properties of LIBs, a fractional‐order system (FOS) with a constant phase component is constructed. Second, to discretize the FOS equation of LIBs, the Grünwald–Letnikov difference, Caputo derivative and Rieman–Liouville difference are employed to establish the corresponding difference equation. Third, a map function is applied to keep the order and SOC of the FOS within an appropriate interval. Further, an approach of IVC is provided for the AFOUPF to increase the accuracy of SOC estimation, taking into account that the accuracy of SOC estimation is impacted if the order of the FOS is relatively small in (0, 1). By utilizing the augmented vector approach, the simultaneous estimations of order, parameters, initial value, and SOC are resolved. Besides, an iterative approach that accommodates the noise covariance matrices is proposed to improve the estimation accuracy. The AFOUPF conducts an unscented transform and resampling on each particle, resulting in a high SOC estimation accuracy in complicated situations. Finally, the availability of AFOUPF is tested by several experiments.

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Section: Introductionmentioning

confidence: 99%

An Initial Value Problem for State of Charge Estimation of Lithium‐Ion Batteries with an Adaptive Fractional‐Order Unscented Particle Filter

Jiao,

Gao,

Chai

et al. 2023

Advcd Theory and Sims

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“…Although the development of renewable energy is an important measure to solve the energy crisis, these energy sources are unstable and intermittent in supplying energy [2]. Therefore, the development of thermal energy storage technology has become the key to solving these problems, as it can improve the comprehensive utilization level of renewable energy [3,4]. Among many thermal energy storage technologies, phase change thermal energy storage technology has gradually become the mainstream energy storage method due to its stable charging and discharging temperature, high energy density, and small volume change.…”

Section: Introductionmentioning

confidence: 99%

Thermal Performance Analysis of Composite Phase Change Material of Myristic Acid-Expanded Graphite in Spherical Thermal Energy Storage Unit

Wang

Deng

et al. 2023

Energies

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In order to improve energy storage efficiency and promote the early achievement of global carbon neutrality goals, this paper proposes a spherical thermal storage unit filled with a composite phase change material (CPCM) comprising myristic acid (MA) and expanded graphite (EG). The effects of EG content and Stefan number (Ste) on the melting performance were investigated through a combination of experiments and numerical simulations. The results show that an increase in EG content (especially for ≥4 wt.% EG) leads to a temperature profile that assumes a concentric ring shape, while the melting rate increases with an increase in both the EG mass fraction and the Ste number. Compared to pure MA, the time required to complete melting was reduced by 82.2%, 85.6%, and 88.0% at EG contents of 4 wt.%, 5 wt.%, and 6 wt.%, respectively. Notably, the Ste value has a greater effect on melting when the EG content is ≤3 wt.%. The optimal EG content in the spherical cell was determined to be 4 wt.%, and a dimensionless analysis established a general correlation between the liquid mass fraction and the Fo, Ste, and Gr numbers.

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“…The PCM can mainly be enclosed in cylindrical [20], rectangular [21], spherical [22,23], trapezate [24], shell-and-tube [25,26], triplex-tube [19,27,28], and parallelepiped [29,30] containers [31,32]. In recent years, researchers have focused on comparing various geometric solutions and their impact on the heat transfer rate.…”

Section: Introductionmentioning

confidence: 99%

Shell Shape Influence on Latent Heat Thermal Energy Storage Performance during Melting and Solidification

Wołoszyn,

Szopa

2023

Energies

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Phase-change materials have various applications across industries from thermal energy storage through automotive battery temperature management systems to thermal stabilisation. Many of these applications are shell and tube structures with different shell shapes. However, it is not yet known how the shape of the shell affects the melting, solidification times, and heat transport processes in such structures. To fill this research gap, seventeen shell shapes/orientations were compared using a simulation study. The well-known and validated enthalpy porosity algorithm implemented in the Fluent 2021R2 software was used. The numerical calculations were preceded by the measurement of thermal conductivity, phase change enthalpy, and specific heat during melting and solidification of the phase-change material. The shortest melting time was achieved for a semi-circular shell shape in the downward position, which was 44% shorter than the reference circular case. The shortest solidification times were recorded for an isosceles trapezium in an upward orientation relative to the reference circular case. Therefore, it is possible to significantly reduce the melting time in shell-and-tube systems as a result of the appropriate selection of the shell shape.

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Thermal performance analysis and optimization of a double-layer spherical phase-change material capsule with annular fins

Cited by 9 publications

References 31 publications

An Initial Value Problem for State of Charge Estimation of Lithium‐Ion Batteries with an Adaptive Fractional‐Order Unscented Particle Filter

An Initial Value Problem for State of Charge Estimation of Lithium‐Ion Batteries with an Adaptive Fractional‐Order Unscented Particle Filter

Thermal Performance Analysis of Composite Phase Change Material of Myristic Acid-Expanded Graphite in Spherical Thermal Energy Storage Unit

Shell Shape Influence on Latent Heat Thermal Energy Storage Performance during Melting and Solidification

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