Experimental investigation of thermal performance and entropy generation of a flat-plate solar collector filled with porous media

Jouybari, H. Javaniyan; Saedodin, Seyfolah; Zamzamian, A.; Nimvari, Majid Eshagh

doi:10.1016/j.applthermaleng.2017.08.170

Cited by 62 publications

(7 citation statements)

References 40 publications

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“…The shape parameter informs how porous and permeable the porous layer is. Jouybari et al [28] discovered that adding a porous substrate to a flat plate solar collector (FPSC) resulted in an 82% increase in the Nu. They stated that using porous foam improves optical efficiency and decreases heat losses, particularly at lower Re.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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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“…They also concluded that the total entropy generation rate increases with an increase in the overall loss parameter. Jouybari et al [ 25 ] experimentally examined the effects of metal foams as passive thermal developers on the performance of water-based flat plate solar collectors. An entropy generation analysis was performed for two similar wetted absorber collectors, the first was a fully filled porous channel, and the second was an empty channel.…”

Section: Introductionmentioning

confidence: 99%

Performance Comparison of Different Flat Plate Solar Collectors by Means of the Entropy Generation Rate Using Computational Fluid Dynamics

Ramírez-Minguela

Rangel-Hernández

Alfaro-Ayala

et al. 2023

Entropy

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In this work, a numerical analysis of three different flat plate solar collectors was conducted using their entropy generation rates. Specifically, the Computational Fluid Dynamics (CFD) technique was used to compare the detailed performance of conventional and zigzag tube geometries of flat plate solar collectors (FPCs) in terms of their entropy generation rates. The effects of fluid viscosity, heat transfer, and heat loss of the flat plate solar collectors were considered for the local and global entropy generation rate analyses. Variations on the inlet volumetric flow rate of the FPCs from 1.0 to 9.0 L/min were simulated under the average solar radiation for one year in the state of Guanajuato, Mexico. The results illustrate and discuss the temperatures, pressures, and global entropy generation rates for volumetric flow variations. The velocity, temperature, and pressure distributions and the maps of the local entropy generation rates inside the collectors are presented and analyzed for the case with a flow rate of 3.0 L/min. These results demonstrate that the zigzag geometries achieved higher outlet temperatures and greater entropy generation rates than the conventional geometry for all the volumetric flow rates considered.

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“…They showed that mas transfer could be one of the main sources of irreversibility. Jouybari et al (2017) performed an entropy generation analysis for a flat plate collector filled with a porous medium and their results showed that the total irreversibility is more dependent on the heat transfer field compared to the flow field. As the porous medium enhances the thermal performance and also increases the pressure drop (Dehghan et al, 2016), using appropriate porous media like metal foams could lead to superior performance.…”

Section: Introductionmentioning

confidence: 99%

On the forced convective flow inside thermal collectors enhanced by porous media: from macro to micro-channels

Dehghan

Nesaz

Pourrajabian

et al. 2021

HFF

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Purpose Aiming at finding the velocity distribution profile and other flow characteristic parameters such as the Poiseuille (Po) number, this study aims to focus on the three-dimensional forced convective flow inside rectangular ducts filled with porous media commonly used in air-based solar thermal collectors to enhance the thermal performance. The most general model for the fluid flow (i.e. the non-linear Darcy–Brinkman–Forchheimer partial differential equation subjected to slip and no-slip boundary conditions) is considered. Design/methodology/approach The general governing equations are solved analytically based on the perturbation technique and the results are validated against numerical simulation study based on a finite-difference solution over a non-uniform but structured grid. Findings The analytical velocity distribution profile based on exponential functions for the above-mentioned general case is obtained, and accordingly, expressions for the Po are introduced. It is found that the velocity distribution tends to be uniform by increasing the aspect ratio of the duct. Moreover, a criterion for considering/neglecting the nonlinear drag term in the momentum equation (i.e. the Forchheimer term) is proposed. According to the sensitivity analysis, results show that the nonlinear drag term effects on the Nusselt number are important only in porous media with high Darcy numbers. Originality/value A general analytic solution for three-dimensional forced convection flows through rectangular ducts filled with porous media for the general model of Darcy–Brinkman–Forchheimer and the general boundary condition including both no-slip and slip-flow regimes is obtained. An analytic expression to calculate Po number is obtained which can be practical for engineering estimations and a basis for validation of numerical simulations. A criterion for considering/neglecting the nonlinear drag term in the momentum equation is also introduced.

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Experimental investigation of thermal performance and entropy generation of a flat-plate solar collector filled with porous media

Cited by 62 publications

References 40 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

Performance Comparison of Different Flat Plate Solar Collectors by Means of the Entropy Generation Rate Using Computational Fluid Dynamics

On the forced convective flow inside thermal collectors enhanced by porous media: from macro to micro-channels

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