Charge and Discharge Analyses of a PCM Storage System Integrated in a High-Temperature Solar Receiver

Giovannelli, Ambra; Bashir, Muhammad Anser

doi:10.3390/en10121943

Cited by 30 publications

(7 citation statements)

References 41 publications

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“…The ultimate overall temperature become relatively low until the total solidification, as shown in Figure 6d. During the discharging process, until the PCM is completely solidified (γ = 0), the ultimate temperature is a little higher (about 10 K) in the cases (3) and (4). The reason is that inserting metal foam leads to a flat temperature gradient.…”

Section: Enhancement Performance Of Metal Foammentioning

confidence: 99%

“…case 31200.5 1065.5 2266.0 case (4) 722.0 640.0 1362.0 Figure 6 presents the temperature variation of three points and the change of PCM average temperature. The point locations are A (0.025, 0.1), B (0.025, 0.2), and C (0.025, 0.3).…”

Section: Enhancement Performance Of Metal Foammentioning

confidence: 99%

“…Consequently, it can be found in many industrial fields, like concentrating solar power plants, waste heat recovery, temperature regulation of buildings, compact heat exchangers, thermal management of electric devices, etc. [3][4][5]. However, the key disadvantage of PCM is its intrinsically low thermal conductivity, which limits the heat transfer rate during the charging and discharging cycles.…”

Section: Introductionmentioning

confidence: 99%

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Thermal Performance of a PCM-Based Thermal Energy Storage with Metal Foam Enhancement

Chen

Xia

et al. 2019

Energies

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The energy transport inside a phase change material (PCM) based thermal energy storage system using metal foam as an enhancement technique is investigated numerically. The paraffin is used as the PCM and water as the heat transfer fluid (HTF). The transient heat transfer during the charging and discharging processes is solved, based on the volume averaged conservation equations. The flow in PCM/foam and HTF/foam composites is modelled by the Forchheimer-extended Darcy equation, while the two-temperature model is employed to account for the local thermal non-equilibrium effect between the foam matrix and fluid phase. The results show that the overall performance is greatly improved by inserting metal foam in both HTF and PCM sides. A nearly 84.9% decrease in the time needed for the total process is found compared with the case of pure PCM, and 40% compared with the case of metal foam insert only in the PCM side. Foam porosity and HTF inlet temperature greatly affect the dynamic heat storage/release process.

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Section: Enhancement Performance Of Metal Foammentioning

confidence: 99%

Section: Enhancement Performance Of Metal Foammentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermal Performance of a PCM-Based Thermal Energy Storage with Metal Foam Enhancement

Chen

Xia

et al. 2019

Energies

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“…A significant improvement in heat exchanger performance and a reduction in PCM melting time in the range of 27-46% were obtained with the change in heat transfer fluid temperature from 60 to 80 • C. The numerical modelling of charging and discharging cycles of phase change materials integrated with air heaters and solar systems is covered in several studies [17][18][19][20][21][22]. The charging and discharging behavior of different phase change materials placed in capsules with various geometries is simulated using computational fluid dynamic (CFD) analysis.…”

Section: Introductionmentioning

confidence: 99%

Energy Saving and Charging Discharging Characteristics of Multiple PCMs Subjected to Internal Air Flow

Hamad

2021

Fluids

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One essential utilization of phase change materials as energy storage materials is energy saving and temperature control in air conditioning and indirect solar air drying systems. This study presents an experimental investigation evaluating the characteristics and energy savings of multiple phase change materials subjected to internal flow in an air heating system during charging and discharging cycles. The experimental tests were conducted using a test rig consisting of two main parts, an air supply duct and a room model equipped with phase change materials (PCMs) placed in rectangular aluminum panels. Analysis of the results was based on three test cases: PCM1 (Paraffin wax) placed in the air duct was used alone in the first case; PCM2 (RT–42) placed in the room model was used alone in the second case; and in the third case, the two PCMs (PCM1 and PCM2) were used at the same time. The results revealed a significant improvement in the energy savings and room model temperature control for the air heating system incorporated with multiple PCMs compared with that of a single PCM. Complete melting during the charging cycle occurred at temperatures in the range of 57–60 °C for PCM1 and 38–43 °C for PCM2, respectively, thereby validating the reported PCMs’ melting–solidification results. Multiple PCMs maintained the room air temperature at the desired range of 35–45.2 °C in the air heating applications by minimizing the air temperature fluctuations. The augmentation in discharging time and improvement in the room model temperature using multiple PCMs were about 28.4% higher than those without the use of PCMs. The total energy saving using two PCMs was higher by about 29.5% and 46.7% compared with the use of PCM1 and PCM2, respectively. It can be concluded that multiple PCMs have revealed higher energy savings and thermal stability for the air heating system considered in the current study.

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“…Furthermore, LHTESS using phase change materials (PCMs) are widely used in various engineering applications such as building temperature regulation, waste heat recovery, compact heat exchangers, solar energy storage, concentrating solar plants, etc. [2,3]. However, their low thermal conductivity is one of their weaknesses because it restricts thermal transport by giving rise to slow heat dissipation during charging/discharging periods.…”

Section: Introductionmentioning

confidence: 99%

Insight into Foam Pore Effect on Phase Change Process in a Plane Channel under Forced Convection Using the Thermal Lattice Boltzmann Method

et al. 2020

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In this work, the two-dimensional laminar flow and the heat transfer in an open-ended rectangular porous channel (metal foam) including a phase change material (PCM; paraffin) under forced convection were numerically investigated. To gain further insight into the foam pore effect on charging/discharging processes, the Darcy–Brinkmann–Forchheimer (DBF) unsteady flow model and that with two temperature equations based on the local thermal non-equilibrium (LTNE) were solved at the representative elementary volume (REV) scale. The enthalpy-based thermal lattice Boltzmann method (TLBM) with triple distribution function (TDF) was employed at the REV scale to perform simulations for different porosities (0.7≤ε≤0.9) and pore per inch (PPI) density (10≤PPI≤60) at Reynolds numbers (Re) of 200 and 400. It turned out that increasing Re with high porosity and PPI (0.9 and 60) speeds up the melting process, while, at low PPI and porosity (10 and 0.7), the complete melting time increases. In addition, during the charging process, increasing the PPI with a small porosity (0.7) weakens the forced convection in the first two-thirds of the channel. However, the increase in PPI with large porosity and high Re number limits the forced convection while improving the heat transfer. To sum up, the study findings clearly evidence the foam pore effect on the phase change process under unsteady forced convection in a PCM-saturated porous channel under local thermal non-equilibrium (LTNE).

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Charge and Discharge Analyses of a PCM Storage System Integrated in a High-Temperature Solar Receiver

Cited by 30 publications

References 41 publications

Thermal Performance of a PCM-Based Thermal Energy Storage with Metal Foam Enhancement

Thermal Performance of a PCM-Based Thermal Energy Storage with Metal Foam Enhancement

Energy Saving and Charging Discharging Characteristics of Multiple PCMs Subjected to Internal Air Flow

Insight into Foam Pore Effect on Phase Change Process in a Plane Channel under Forced Convection Using the Thermal Lattice Boltzmann Method

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