Entropy generation analysis of multilayer PCM slabs integrated with fins

Asker, Mustafa; Alptekin, Ersin; Ezan, Mehmet Akif; Ganjehsarabi, Hadi

doi:10.1504/ijex.2018.092511

Cited by 8 publications

(5 citation statements)

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“…Case 2 with ε =0.98, Case 3 with ε =0.96 and Case 4 with ε =0.92 which have higher k eff compared to the other cases. The effective thermal conductivity of PCM is calculated based on Equation (11). The solidification mechanism begins from the outer layer that is subjected to the heat convection, and advances inward towards the center of the spherical capsule.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, these systems alone do not have a good economic justification. In order to improve the performance of TES systems, various methods are handled, the most important of which are: increasing heat transfer area by using fins [10], PCM encapsulation, simultaneous use of multiple PCMs [11] and filling PCMs in shape stable structures [12]. Narasimhan et al [13] used an enthalpy method to analyze the solidification inside a spherical capsule.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Study on Solidification of Phase Change Materials Embedded with Metal Foam

Asker

Genceli

2021

European Mechanical Science

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This work investigates the solidification of phase change material (PCM) embedded with metal foam (MF) in a spherical capsule which its outer layer is exposed to convective heat transfer. The one-dimensional energy equation is resolved by performing finite volume method accompanied with temperature transforming technique. Four separate scenarios are developed for different porosity value of MF in order to analyze the thermal behavior of composite PCM with MF. The numerical model is validated by experimental data taken from the literature and substantially good agreement is demonstrated. The results show that at the case where the porosity ε =0.92, the elapsed time for complete solidification is decreases by 88% compared to the case without MF (ε =1.0).

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Study on Solidification of Phase Change Materials Embedded with Metal Foam

Asker

Genceli

2021

European Mechanical Science

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“…In addition, phase change behaviors in PCM play a crucial role in the construction of the TES systems. 4 PCM encapsulation can be augmented in different techniques, such as utilizing cylindrical shapes or spherical containers. The basic superiority of using a spherical capsule is the probability of utilizing the immense heat of phase change of PCM materials in roughly small-sized volumes.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of thermal energy storage system inside a spherical capsule under periodic boundary conditions

2022

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In this work, inward solidification process of a spherical capsule subjected to a periodic boundary condition is numerically studied. The temperature transforming technique is utilized to solve the 1D phase change model and an inhouse model developed in C++. The interface position and the transient temperature profiles are evaluated with respect to the different oscillation amplitudes and oscillation frequencies of the periodically oscillating surface temperature.The results demonstrate that in the situation where the amplitude is 30, the elapsed time for total solidification is dropped by 23.7% compared to the case without oscillation. It is also found that there is a 21.8% reduction in the time for total solidification when the frequency is changed from ω = π/64 to ω = 0.

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“…Erek and Dincer 11 has applied exergy concept for a shell‐and‐tube type heat exchanger and has proved the effectiveness of exergy concept in assessment and optimization of energy storage systems. Furthermore, Asker et al 12 have applied composite phase change materials (PCMs) integrated with fins and have assessed its effect numerically. Ghorbani et al conducted a study on energy and exergy analyses of a CAES system using phase change material as the thermal energy storage medium of their proposed model.…”

Section: Introductionmentioning

confidence: 99%

Design and optimization of a novel wind‐powered liquefied air energy storage system integrated with a supercritical carbon dioxide cycle

et al. 2021

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In this paper, a novel liquefied air energy storage (LAES) system driven by wind energy and natural gas, integrated with a two‐stage supercritical carbon dioxide cycle is proposed and investigated. Three different sensible thermal energy storage (TES) systems are considered in this study to store the heat produced in the compressions stage and use it later to improve the performance. The proposed system is analyzed in terms of energy, exergy, exergo‐economic, and environmental impacts. A detailed economical and technical investigation is carried out to determine system hotspots, exergy destruction rates, and the performance of the system and subsystems. Finally, by considering ten design variables, the nondominated sorting genetic algorithm‐II (NSGA‐II) is employed to evaluate the optimal design solutions for double objective functions, including cost per unit of exergy and overall system exergy efficiency. Results indicate that for a 50 MW of discharging power, 80.75 MW of charging electricity and 1.22 kg/s of fuel are required. Additionally, the product cost per unit of exergy and the levelized costs are calculated as 32.02 $/GJ and 0.133 $/kWh, respectively. The results of the optimization study also show that for the optimal Pareto solution, the energy efficiency would be 52.2% while the exergy efficiency is 45.26%.

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Entropy generation analysis of multilayer PCM slabs integrated with fins

Cited by 8 publications

References 0 publications

Numerical Study on Solidification of Phase Change Materials Embedded with Metal Foam

Numerical Study on Solidification of Phase Change Materials Embedded with Metal Foam

Numerical simulation of thermal energy storage system inside a spherical capsule under periodic boundary conditions

Design and optimization of a novel wind‐powered liquefied air energy storage system integrated with a supercritical carbon dioxide cycle

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