Numerical Study on the Enhanced Thermal Performance of the Porous Media-Assisted Flat-Plate Solar Collector

Xia, Yongfang; Lin, Xinwei; Cheng, Zude; Xie, Fang; Jian, Huang

doi:10.1155/2023/2244771

Cited by 6 publications

(3 citation statements)

References 37 publications

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“…It is also discovered that when pore density rises, the eventually declines to a nearly constant value. This pattern is remarkably similar to previous studies, such as Xia et al [1,38] and Nimvari et al [60]. Although growing pore density at a fixed porosity can enhance heat transmission surface area, the mass flow within the foam zone drastically reduces.…”

Section: Heat Transfer Characteristicssupporting

confidence: 91%

“…Using a large number of rectangular porous blocks with high permeability enhances heat transfer efficiency within the FPSC channel [1,38] Darcy -extended Forchheimer model, with LTNE model Simulations focused on fluid flow and heat transfer within an SAH channel incorporating copper metal foam with a porosity of 90% were carried out Present (1)…”

Section: Problem Description and Assumptionsmentioning

confidence: 99%

“…The PEC demonstrates a peak increase of 12.5% compared to designs lacking the chamfered structure. Xia et al [1,38] conducted a numerical analysis to examine the comprehensive heat transfer characteristics within the FPSC channel. This study considered different shapes of porous blocks, quantity, permeability, and materials that were inserted into the FPSC channel.…”

Section: Introductionmentioning

confidence: 99%

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Computational insights into the thermal performance enhancement of solar air heater channel through metal foam integration

Al-Chlaihawi,

Hasan,

Kaied

2024

ETJ

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 Fluid flow and heat transfer in an SAH channel with metal foam were simulated  The LTNE and DEF models were used.  The thermo-hydraulic performance of SAH was analyzed, considering several key factors.  Compared to the empty SAH duct, Nu rises 9-10.6 times and friction factor by 53.5-56.6 times.  TPF varies from 2.33 to 2.82 at H f =0.6 and ω=10 PPI.The two-dimensional numerical simulations focused on fluid flow and heat transfer within a solar air heater (SAH) channel incorporating copper metal foam with a porosity of 90% were carried out in this study. The Local Thermal Nonequilibrium (LTNE) and Darcy-Extended Forchheimer (DEF) models were employed to predict fluid and thermal transport in the partially porous SAH channel. In the free flow zone, the turbulence model was utilized. The thermal and thermo-hydraulic performances of SAH were examined concerning several factors, including pore density ( ), Reynolds number ( ), and dimensionless foam height ( ). The results demonstrate that inserting a porous substrate into the SAH can substantially increase heat transmission. This enhancement ranges from 4.4 to 18.04 times compared to an empty duct for at . Moreover, increased porous layer height and pore density lead to a corresponding increase in pressure drop. Evaluating both the improvement in heat transmission and the associated pressure penalty, the case with , and demonstrate superior overall performance, boasting a higher Thermal Performance Factor ( ) of 2.82 when compared to an empty channel. This work presents significant findings on optimizing metal foam applications in SAH systems, offering new insights into the field.

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Section: Heat Transfer Characteristicssupporting

confidence: 91%

Section: Problem Description and Assumptionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Computational insights into the thermal performance enhancement of solar air heater channel through metal foam integration

Al-Chlaihawi,

Hasan,

Kaied

2024

ETJ

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Optimizing heat transfer within a rectangular channel through intermittent metal foam block configurations: A numerical study

Al‐Chlaihawi,

Hasan,

Ekaid

2024

Heat Trans

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A thorough numerical investigation was carried out to examine the heat transfer characteristics within a rectangular channel integrated with metal foam blocks for solar air heating applications. The study employed numerical simulations using the extended Darcy–Forchheimer model with the assumption that there exist local thermal nonequilibrium conditions within the porous foam region. Four configurations, denoted as P–A, P–P, A–P, and A–A, were explored based on the presence or absence of foam blocks relative to the heated section. The study meticulously analyzed the influence of key parameters, such as the number of foam blocks (N = 1–5), permeability (quantified by pore density, ), and Reynolds number (), on the thermohydraulic performance. The results were promising, indicating a significant increase in the average Nusselt number () with the inclusion of foam blocks, albeit accompanied by an undesirable increase in the friction factor. Among the various configurations, the P–A arrangement, where porous blocks are situated at the entrance of the heating channel, exhibited superior thermal performance. Furthermore, the optimal heat transmission rate was attained with a single porous block (N = 1) in the P–A configuration, at a Reynolds number of 16,000 and high permeability (). Conversely, the maximum friction factor was observed with five porous blocks (N = 5) in the A–P configuration, at a Reynolds number of 4000 and low permeability (). The exhaustive analysis of thermohydraulic performance was evaluated using the performance evaluation criterion (PEC), which optimizes the trade‐off between increased heat transfer rate and consequent pressure loss. The P–A arrangement, particularly with higher permeability and a minimal number of porous blocks, demonstrated the highest PEC value of 2.71, representing a significant 171% improvement compared with an empty channel. This study underscores the effectiveness of strategically placing and optimizing metal foam blocks to improve the thermal performance of heat exchanger systems.

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Optimizing of a metal foam-assisted solar air heater performance: a thermo-hydraulic analysis of porous insert placement

Al-Chlaihawi,

Hasan,

Ekaid

2024

Environ Sci Pollut Res

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A numerical assessment of the heat transfer efficacy of a Solar Air Heater (SAH) was carried out. The SAH is supplied with a porous metal foam layer to improve thermal mixing. Both the two temperature equations assuming Local Thermal Non-equilibrium (LTNE) and Darcy-Extended Forchheimer (DEF) models were employed to forecast fluid and thermal transport within the partly filled SAH channel. The analysis was performed for various values of foam layer lengths (𝑆 = 0 − 1), pore densities (𝜔 = 10 − 40 𝑃𝑃𝐼), and Reynolds numbers (𝑅𝑒 = 4000 − 16,000) at a fixed value of layer thickness (𝐻 𝑓 = 0.6). Based on the position of the porous layer, three distinct arrangements, marked as Case 1, Case 2, and Case 3 were explored. Regarding the parameters examined, the findings indicate a definite improvement in the average Nusselt number (𝑁𝑢), but unfortunately, the friction factor also increases unfavorably. By reducing the length of the porous layer, a reasonable reduction in heat transfer rate and a significant decrease in pressure drop were noticed. The results showed about 26.64%, 48.73% and 70.74% reductions in pressure drop by reducing the dimensionless foam length from 1 to 0.25, 0.5 and 0.75 respectively for 𝜔 = 10 at 𝑅𝑒 = 16,000. In contrast there are only about 11.05%, 23.11% and 40.78% reductions in 𝑁𝑢. The exhaustive analysis of the thermal performance of SAH was conducted using the thermal performance factor (TPF), which considers the trade-off between the SAH channel's potential for improved heat transmission and its cost for pressure loss. The TPF may reach a maximum of 2.82 compared to the empty channel when the metal foam layer is inserted with 𝑆 = 1, for 𝜔 = 10, and 𝑅𝑒 = 16,000.

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Numerical Study on the Enhanced Thermal Performance of the Porous Media-Assisted Flat-Plate Solar Collector

Cited by 6 publications

References 37 publications

Computational insights into the thermal performance enhancement of solar air heater channel through metal foam integration

Computational insights into the thermal performance enhancement of solar air heater channel through metal foam integration

Optimizing heat transfer within a rectangular channel through intermittent metal foam block configurations: A numerical study

Optimizing of a metal foam-assisted solar air heater performance: a thermo-hydraulic analysis of porous insert placement

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