Comparative performance assessment of different absorber tube geometries for parabolic trough solar collector using nanofluid

Khan, Muhammad Sajid; Yan, Mi; Ali, Hafız Muhammad; Amber, Khuram Pervez; Bashir, Muhammad Anser; Akbar, Bilal; Javed, Samina

doi:10.1007/s10973-020-09590-2

Cited by 44 publications

(19 citation statements)

References 28 publications

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“…The simulation parameters and main dimensions of the present system are adopted from Bellos et al, 19 presented in Table 2. In addition, the authors in their previous article 4 discussed the modeling of PTC with smooth absorber tube. Following eight cases are investigated:…”

Section: System Descriptionmentioning

confidence: 99%

“…The useful energy available, thermal efficiency, exergy efficiency and available solar radiation are required to analyze the solar collector. The equations used to model the PTC are adopted from References 4,12 and 19.…”

Section: Thermodynamic Analysismentioning

confidence: 99%

“…Among the renewable energy resources, solar energy is the most promising source of energy that has importance in the energy demand of power sector and solar capacity of world is anticipated to reach 600 GW claimed by International Energy Agency (IEA) 3 . Although, many concentrated solar power (CSP) technologies can be used for power generation and industrial process heating applications but parabolic trough collector (PTC) has been extensively studied and evaluated due to its higher efficiency, reasonable cost and temperature of up to 800 K 4,5 …”

Section: Introductionmentioning

confidence: 99%

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Thermal and thermodynamic comparison of smooth and convergent‐divergent parabolic trough absorber tubes with the application of mono and hybrid nanofluids

et al. 2020

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Summary The utilization of hybrid nanofluids is a promising technique in the high temperature solar applications specially, parabolic trough collector (PTC). The purpose of the current research is to analyze, evaluate and compare the performance of PTC (converging‐diverging absorber tube) using mono and hybrid nanofluids to increase the convective heat transfer coefficient. To obtain this objective, converging‐diverging tube with sine geometry is examined as it enhances the turbulence in the flow due to increase in the inner surface roughness. The performance of the absorber tube is assessed for hybrid nanofluid (1.5% MWCNTs/therminol‐VPI and 1.5% TiO2/therminol‐VPI) as well as mono nanofluids (3% MWCNTs and 3% TiO2)/therminol‐VPI at a wide range of inlet temperature ranges from 350 K to 600 K. In order to compare the results of the converging‐diverging tube, a smooth absorber tube is also investigated at the same design conditions. Furthermore, our study comprises of the overall performance investigation about the exergy analysis, pressure drop, pumping power required and performance evaluation criteria to investigate the comprehensive performance of the absorber tubes. The results of the study reveal that the use of modified geometry with hybrid nanofluids considerably improves the performance of the system due to the presence of swirls and turbulence that will reduce absorber surface temperature and ultimately the heat losses. More specifically, the thermal efficiency enhancement for the converging‐diverging absorber tube with hybrid nanofluids ranges from 3.61% to 5.27%, while it is varied from 1.70% to 1.91% for smooth tube using hybrid nanofluids. Reynolds number ranges from 12 000 to 90 300 for hybrid nanofluid, while it is from 14 000 to 97 600 for pure therminol‐VPI. Furthermore, mean enhancement in the heat transfer coefficient using converging‐diverging tube with hybrid, TiO2 and MWCNTs therminol‐VPI‐based nanofluids are 1.72%, 0.67% and 0.70%, respectively at a mass flow rate of 0.6 kg/s and an ambient temperature of 300 K. The converging‐diverging/hybrid case has the values of 1.47 and 1.33 for performance evaluation criteria I and II, while all other cases has significantly less values compared to hybrid nanofluids. The thermal efficiency enhancement has a pressure‐drop penalty that leads to higher pumping power requirement; however, this requirement is very small as compared to the useful energy gain.

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Section: System Descriptionmentioning

confidence: 99%

Section: Thermodynamic Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermal and thermodynamic comparison of smooth and convergent‐divergent parabolic trough absorber tubes with the application of mono and hybrid nanofluids

et al. 2020

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“…Developing energy solicitations have encouraged the expansion of novel archetypes for the utilization of renewable energies [1]. Nowadays, parabolic trough solar collectors (PTSCs) that are used in solar power plants and thermic applications are investigated by several authors for their increased performance evolution criteria (PEC) [2][3][4][5][6][7][8][9][10][11][12][13]. For surface-based receivers, the spectral elective absorption cover and vacuum insulating have been commonly needed to achieve more temperatures for industrial and commercial employment.…”

Section: Introductionmentioning

confidence: 99%

“…For employed model, a factor that contains the pressure drop and Nusselt number named as evaluation criterion was defined and used. Khan et al [11] performed a numerical investigation on the three different absorber tube geometries employed in parabolic trough solar collector (inserted twisted tape, longitudinal fins and smooth absorber tube) in the presence of Al 2 O 3 /water nanofluid as working fluid. Their outcome showed that absorber tube thermal efficiency accompanied with twisted tape insert filling with nanofluid and that for absorber tube accompanied with internal fins filling with nanofluid are about 72%.…”

Section: Introductionmentioning

confidence: 99%

Two-phase nanofluid flow simulation with different nanoparticle morphologies in a novel parabolic trough solar collector equipped with acentric absorber tube and insulator roof

Arani

Monfaredi

2020

J Braz. Soc. Mech. Sci. Eng.

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The main objective of the present work is to investigate the morphology effects of Syltherm 800 oil-based γ-AlOOH nanofluid on performance evaluation criterion (PEC) and energy efficiency of a novel parabolic trough solar collector (PTSC) numerically using finite volume method. The other goal is to compare the obtained results of nanofluid simulation in PTSC using single-phase mixture model (SPM) with two-phase mixture model (TPM). In addition, influences of using acentric absorber tube are determined. Consequently, in this step the optimum configuration is introduced and then different nanofluids characteristics such as volume fractions, nanoparticles diameters and shapes on the optimum configuration are investigated. Based on the obtained results, for all studied cases, obtained PEC and energy efficiencies employing the TPM in nanofluid simulation are more than that SPM simulation. Using the novel PTSC leads to the higher average Nusselt number, energy efficiency, PEC and outlet temperature at all Reynolds numbers. For all cases, the PEC and energy efficiency increase by reduction of nanoparticle volume fraction and diameter. As the Reynolds number increases, the energy efficiency of PTSC increases for all studied cases till Reynolds number equal to 5000 and then always reduces. Therefore, the optimum Reynolds number is 5000. The optimum morphology is related to the nanoparticles shape of blade which is followed by the brick, cylinders and platelet, respectively.

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Computational single‐phase comparative study of a Williamson nanofluid in a parabolic trough solar collector via the Keller box method

2021

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Summary A solar thermal collector collects heat by absorbing sunlight and converting this incoming radiation into useful thermal energy. The parabolic trough solar sollector (PTSC) is widely installed in concentrated solar power technology with a temperature range of 325‐700 K. The thermodynamic efficiency of the PTSC can be intensified by using nanofluids owing to their enhanced thermophysical properties. In this paper, the two‐dimensional flow over a stretched sheet in PTSC under Williamson nanofluid effects is explored. With the help of useful transformations, the partial differential equations arising from boundary layer equations of the Williamson nanofluid model are changed into nonlinear ordinary differential equations. The Keller box numerical scheme is then used to find the solution of the resulting nonlinear ordinary differential equations. Two nanofluids, copper‐engine oil (Cu‐EO) and alumina‐engine oil (Al2O3‐EO) are considered to address the performance analysis of PTSC in this study. It is observed that the parameters of the porous media reduced the heat transfer rate but increased the velocity gradient. In order to examine the effect on various performance parameters of the device, the nanoparticle concentration is also varied. With the increase in the Reynolds and Brinkman numbers, the entropy is found to increase. The thermodynamic performance of the Cu‐EO nanofluid is remarkably better than that of the Al2O3‐EO nanofluid under the same conditions. The thermal efficiency of Cu‐EO over Al2O3‐EO is seen with a minimum of 1.5% and a maximum of 9.1%. The theoretical simulations documented here may be effective in improving solar thermal energy systems.

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Comparative performance assessment of different absorber tube geometries for parabolic trough solar collector using nanofluid

Cited by 44 publications

References 28 publications

Thermal and thermodynamic comparison of smooth and convergent‐divergent parabolic trough absorber tubes with the application of mono and hybrid nanofluids

Thermal and thermodynamic comparison of smooth and convergent‐divergent parabolic trough absorber tubes with the application of mono and hybrid nanofluids

Two-phase nanofluid flow simulation with different nanoparticle morphologies in a novel parabolic trough solar collector equipped with acentric absorber tube and insulator roof

Computational single‐phase comparative study of a Williamson nanofluid in a parabolic trough solar collector via the Keller box method

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