Design of fin structures for phase change material (PCM) melting process in rectangular cavities

Oliveski, Rejane De Césaro; Becker, Fábio; Rocha, Luíz Alberto Oliveira; Biserni, Cesare; Eberhardt, Gabriel Eduardo Strohm

doi:10.1016/j.est.2021.102337

Cited by 64 publications

(16 citation statements)

References 36 publications

(50 reference statements)

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“…Code validation is also performed. Figure 4 shows the melting fraction comparisons considering different time instances with the values available in the results of De Césaro Oliveski et al (2021). They used fins with aspect ratio of 0.013 while 343 K was used as the wall boundary condition.…”

Section: Solution Methods and Code Validationmentioning

confidence: 99%

“…Following governing equations, continuity, momentum and energy are used in the computational model, respectively, (De Césaro Oliveski et al , 2021 and Bouzennada et al , 2021) as: where ρ, V, P, g, ß, H, T and t are, respectively, the density, velocity, pressure, gravity, thermal expansion coefficient, enthalpy, temperature, time, whereas u c is fluid velocity. Here, trueS→ denotes the porosity function's source term ( S→=−(1−f)2(f3+ε)CV→) with C as the mushy zone morphology constant (Brent et al , 1988).…”

Section: Computational Modelmentioning

confidence: 99%

“…Melting fraction is f can be defined and written as follows (Bouzennada et al , 2021): H for PCMs in the enthalpy method (De Césaro Oliveski et al , 2021; Bouzennada et al , 2021): where h ref is reference enthalpy, T ref is reference temperature, c p specific heat at constant pressure.…”

Section: Computational Modelmentioning

confidence: 99%

“…Time-dependent melting fraction comparisons with the results of De Césaro Oliveski et al (2021) (a) and Dhaidan et al (2013) (b)…”

Section: Figurementioning

confidence: 99%

“…The cabinets designed as heat sources in the model are fixed to the initial constant T h temperature and T h = 333.15 K. Cabins (red color) and ambient are cooled by air at T c temperature and tip speed. Following governing equations, continuity, momentum and energy are used in the computational model, respectively, (De Césaro Oliveski et al, 2021 andBouzennada et al, 2021) as:…”

Section: Computational Modelmentioning

confidence: 99%

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Numerical analysis for thermal management of data center with phase change material

Öztop

Özgul

Selimefendigil

2022

HFF

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Purpose The purpose of this paper is to analyze the performance of a data center and thermal management by using phase change material (PCM). Numerical studies were conducted for two dimensional model of data center and installation of PCM at different locations. Design/methodology/approach Finite volume method was used for the unsteady problem, while impacts of air velocity and PCM location on the flow field, thermal pattern variations and phase change dynamics were evaluated. Three different locations of the PCM were considered while air velocity was also varied during the simulation. Thermal field variations and cooling performance of the system for different PCM location scenarios were compared. Findings It was observed that the installation of the PCM has significant impacts on the vortex formation, thermal field variation within the system and its performance. The left, right and top wall installation of the PCM changed the thermal patterns near the heat cell of the data centre. The phase change process is fast for the upper wall installation of the PCM, while the discrepancy of the melt fraction dynamics between different air flow at this position is minimum. The case where PCM placed in the upper wall at the highest air velocity is the best configuration in terms of heat storage. The utilization of PCM and changing its locations provide an excellent tool for thermal management and cooling performance of data centre. Originality/value Results of this study can be used for initial design and optimization of cooling systems for thermal management of data centers while the importance of the high-performance computing becomes very crucial for the advanced simulations in different technological applications.

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Section: Solution Methods and Code Validationmentioning

confidence: 99%

Section: Computational Modelmentioning

confidence: 99%

Section: Computational Modelmentioning

confidence: 99%

“…Time-dependent melting fraction comparisons with the results of De Césaro Oliveski et al (2021) (a) and Dhaidan et al (2013) (b)…”

Section: Figurementioning

confidence: 99%

Section: Computational Modelmentioning

confidence: 99%

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Numerical analysis for thermal management of data center with phase change material

Öztop

Özgul

Selimefendigil

2022

HFF

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Performance enhancement of latent heat storage unit by the multiple chambers

2023

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The thermal conductivity of phase change material (PCM) is one of the essential variables for the fast heat transfer process for latent heat energy storage (LHES) units. The thermal characteristics of a novel LHES rectangular enclosure based on multiple chambers separated by insulating and rigid walls are numerically investigated. The enthalpy‐porosity strategy supported by the finite volume method is implemented to perform the simulation. Simulation results exhibited that thermal charging and discharging performance was enhanced without affecting the system's total heat storage capacity by creating multiple chambers. Liquid fraction, mean temperature, heat flux, contours of liquid fraction and temperature of PCM are demonstrated as a function of the melting time. The thermal charging time of PCM is diminished by increasing the number of chambers. Although, the consequences of the number of chambers on the melting time of PCM are diminished by surging the number of chambers. It was also found that continuously raising the heating temperature is not beneficial for reducing the total time of liquid fraction during melting. Thermal discharging performance is poor than that of the thermal charging process.

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Improvement of melting performance in a longitudinal finned latent heat thermal energy storage unit

et al. 2023

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This article presents an analysis and enhancement of the charging behavior of a double‐pipe LHTES unit with longitudinal fins for concentrated solar power applications using a finite element numerical analysis approach. The finite element approach is applied to this numerical analysis by using “COMSOL Multiphysics” software. The investigated LHTES system has an operating temperature range of 180°C‐300°C and uses “DelcoTerm Solar E 15” as the heat transfer fluid (HTF) with a eutectic inorganic mixture of sodium nitrite and sodium nitrate as the phase change material (PCM). While also taking into account the impact of the tube material and the number of fins, the primary goal of this study is to evaluate performance improvement by changing the thickness and number of fins in a linked manner without changing the storage unit capacity. The results show a maximal impact on thermal performance which decreased the melting time by 46% and the charging time by 49.6% for the configuration with a fin thickness of 1 mm, 27 longitudinal fins, an inner tube made of aluminum, and a mass flow rate of 60 kg/h.

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Design of fin structures for phase change material (PCM) melting process in rectangular cavities

Cited by 64 publications

References 36 publications

Numerical analysis for thermal management of data center with phase change material

Numerical analysis for thermal management of data center with phase change material

Performance enhancement of latent heat storage unit by the multiple chambers

Improvement of melting performance in a longitudinal finned latent heat thermal energy storage unit

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