Simulation of a parabolic trough solar collector containing hybrid nanofluid and equipped with compound turbulator to evaluate exergy efficacy and thermal‐hydraulic performance

Khetib, Yacine; Alahmadi, Ahmad Aziz; Alzaed, Ali; Sharifpur, Mohsen; Cheraghian, Goshtasp; Siakachoma, Cornelius

doi:10.1002/ese3.975

Cited by 12 publications

(8 citation statements)

References 66 publications

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“…In equation (2), the Lorentz force is represented by the terms    J and B , where  J is [35]: The following equations are used to estimate the hybrid nanofluid's specific heat capacity, viscosity, density, electrical conductivity, and thermal conductivity [31][32][33]:…”

Section: Equationsmentioning

confidence: 99%

Investigation into the effects of hydrophobicity on thermohydraulic characteristics and entropy generation of hybrid nanofluid with the magnetic property in a micro-heat sink under a magnetic field

et al. 2023

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The cooling process of the devices is a big challenge in the electronic industry, and most of the process units (graphical are central) experience defects under harsh temperature conditions, so dissipating generated heat under various working conditions should seriously be studied. This study investigates the magnetohydrodynamics of hybrid-ferro nanofluids in the presence of hydrophobic surfaces in a micro-heat sink. To scrutinize this study, a Finite Volume Method (FVM is applied. The ferro nanofluid includes water as base fluid and Multiwall Carbon Nanotubes (MWCNTs) and Fe3O4 as nano-additives, which are used in three concentrations (0, 1 and 3%). The other parameters such as Reynold number (5-120), Hartmann number (magnitude of the magnetic field from 0 to 6) and hydrophobicity of surfaces are considered to be scrutinized for their impacts on heat transfer and hydraulic variables as well as entropy generation ones. The outcomes indicate that increasing the level of hydrophobicity in surfaces leads to improve heat exchange and reduces the pressure drop simultaneously. Likewise, it decreases the frictional and thermal types of entropy generations. Intensifying the magnitude of the magnetic field enhances the heat exchange as much as the pressure drop. In the same result, it can decrease the thermal term in entropy generation equations for the fluid, but it increases the frictional one and adds a new term named magnetic entropy generation. Incrementing Reynolds number improves the convection heat transfer parameters although it intensifies the pressure drop in the length of the channel. Also, the thermal and frictional kinds of entropy generation decrease and increase with increasing the flow rate (Reynold number).

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Section: Equationsmentioning

confidence: 99%

Investigation into the effects of hydrophobicity on thermohydraulic characteristics and entropy generation of hybrid nanofluid with the magnetic property in a micro-heat sink under a magnetic field

et al. 2023

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“…In Equation (26), n and i are collector lifetime and interest rates which are 20 years and 6%, respectively.…”

Section: Mathematical Formulationmentioning

confidence: 99%

“…In addition, the NSGA-II method has been applied to optimize for two different problems: first, to maximize energy and exergy efficiency and minimize costs and second, to reduce emissions and EE&EW consumption. To the best of our knowledge, although there are many 4E assessments and optimization of PTCs in the literature, 26,27 this is the first study in the field of DAPTCs optimization aimed to reach the above objectives.…”

Section: Introductionmentioning

confidence: 99%

Multi‐objective assessment of a DAPTC based on 4E analysis: Water‐energy‐environment nexus

Saray

Heyhat

2022

Intl J of Energy Research

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Summary This study aims to thermodynamic analysis and optimizes the performance of a nanofluid‐based direct absorption parabolic trough collector (DAPTC) using a non‐dominated sorting genetic algorithm (NSGA‐II). For this purpose, silicon carbide (SiC) and copper oxide (CuO) at three different volume fractions (0.01%, 0.05%, and 0.1%) are used as the nanoparticles and water as the base fluid. The results obtained using the method presented in the current study are verified through experimental results, which are in good agreement with those. A comprehensive analysis is conducted to determine the effect of operating conditions and geometric dimensions on the energy and exergy efficiencies and economic performance of the DAPTC. In addition, an environmental investigation is performed to determine the effect of using nanofluids on CO2, NOx, and SOx reduction. Under the operating conditions, the cost of energy production, when SiC/water and CuO/water nanofluids are utilized instead of the base fluid, is reduced by 31.08% and 47.92%, respectively. The use of SiC/water and CuO/water nanofluids can reduce CO2 emissions by 216.18 and 332.55 kg and also water consumption by 968.1 and 1489.1 m3, respectively. The optimum energy and exergy efficiencies are 65.53% and 38.97%, respectively. Also, the SiC/water and CuO/water nanofluids have a 35% and 67.35% environmental impact, respectively. Highlights Multi‐objective optimization of a DAPTC using the NSGA‐II algorithm. The energy, exergy, economic, and environment of solar collectors were analyzed. The 547.86 MJ energy and 1489.1 m3 water were saved by the exploitation of CuO/water nanofluid. The 316.15 MJ energy and 968.1 m3 water were saved by the exploitation of SiC/water nanofluid. CO2 emissions decreased by 332.55 and 216.18 kg using CuO/water and SiC/water.

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“…It is defined as the ratio between the Nusselt number improvement and friction factor penalties of employed heat transfer enhancement methods and a baseline case without any methods employed. Various studies have utilized this approach for diverse thermal engineering applications as an optimization technique [23][24][25][26]. Besides this, complex flows involving large temperature gradients are often investigated utilizing first law analysis for thermodynamic evaluation.…”

Section: Introductionmentioning

confidence: 99%

Thermohydraulic and Irreversibility Analyses of Swirl Flows Utilizing Distorted Radial Fins: Entropy Generation and Entransy Dissipation Evaluation

Ho,

Tan,

Hung

et al. 2023

International Journal of Energy Research

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The current investigation analyses the convective heat transfer performance, entropy generation, and entransy evaluation of swirl flows generated by distorted radial fins (DRF). As swirl flows and various vortical structures induce large temperature gradients, second law and entransy analyses are necessary to thoroughly evaluate their true thermodynamic influence on heat transfer enhancement. The results indicated that due to the influence of swirl flows and vortices, all angles of the DRF were capable of inducing intense fluid mixing, thinner thermal boundary layers, and turbulent eddies. It was found that overaggressive swirl flows may hinder local heat transfer performances, by enclosing low-velocity heated fluids within the thermal boundary layers. However, as these overaggressive swirl flows and strong vortices propagate downstream, beneficial fluid mixing was eventuated, favouring heat transport over large regions. In terms of thermal performances, the maximum heat transfer enhancement was exhibited by the α=45° DRF, improving the Nusselt numbers up to 59.3%. Accordingly, the highest performance evaluation criterion (PEC) of 1.269 was obtained by the α=45° DRF at the Reynolds number 2389, attributed to the centrifugal effects of the swirl flows. Optimal entropy generation numbers were also exhibited by the α=45° DRF at the highest studied Reynolds number, reducing total entropy generation by 36.81%. Lower entransy thermal resistances were also accredited to greater DRF angles due to the intense swirl effects. In essence, the study concludes that the effects of swirl flows and vortices significantly enhance heat transfer, whilst reducing both entropy generation and entransy dissipation rates, leading to optimal thermal performances.

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Simulation of a parabolic trough solar collector containing hybrid nanofluid and equipped with compound turbulator to evaluate exergy efficacy and thermal‐hydraulic performance

Cited by 12 publications

References 66 publications

Investigation into the effects of hydrophobicity on thermohydraulic characteristics and entropy generation of hybrid nanofluid with the magnetic property in a micro-heat sink under a magnetic field

Investigation into the effects of hydrophobicity on thermohydraulic characteristics and entropy generation of hybrid nanofluid with the magnetic property in a micro-heat sink under a magnetic field

Multi‐objective assessment of a DAPTC based on 4E analysis: Water‐energy‐environment nexus

Thermohydraulic and Irreversibility Analyses of Swirl Flows Utilizing Distorted Radial Fins: Entropy Generation and Entransy Dissipation Evaluation

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