Thermal performance analysis of a parabolic trough collector using water-based green-synthesized nanofluids

Okonkwo, Eric C.; Essien, Edidiong A.; Akhayere, Evidence; Abid, Muhammad; Kavaz, Doğa; Ratlamwala, Tahir Abdul Hussain

doi:10.1016/j.solener.2018.06.012

Cited by 87 publications

(20 citation statements)

References 35 publications

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“…This value is acceptable and reliable in PTC application [36]. Moreover, the present model was compared with other numerical work to prove the accuracy; the results of thermal efficiency of the present model showed more precise results and lower mean deviation results compared with Okonkwo work [49], which has a mean deviation equal 2.5% with same experimental results.…”

Section: Thermal Model Validationsupporting

confidence: 58%

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Exergy and energy amelioration for parabolic trough collector using mono and hybrid nanofluids

Al–Oran

Lezsovits

Aljawabrah

2020

J Therm Anal Calorim

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Energy and exergy efficiency amelioration of the parabolic trough has taken high interest since recent years, especially when nanofluid used as an enhancement category. This paper aimed to improve LS-2 parabolic trough model and compare the enhancement effect that occurred using different mono and hybrid nanofluids. Inserting mono nanoparticles of Al 2 O 3 , CeO 2 , CuO, and hybrid combinations of Al 2 O 3 with CeO 2 , or CuO nanoparticles in a Syltherm 800 was investigated by five different cases. The investigation was presented under total volume fraction 4% for all nanofluids and mixing fraction 50:50 for the hybrid types in order to facilitate the analysis and compare various results at the same conditions. Those cases and their comparisons were solved using MATLAB Symbolic tools under turbulent flow regime and variable inlet temperature to present wide domain behavior for the energy and exergy efficiency, Nusselt number, heat transfer coefficient, and pressure drop, whereas the analytical solution of the energy balance equation was taken from the literature and improved to cover the mentioned cases. Moreover, the results were compared with previous researches that used different thermal fluid and showed high accuracy behavior with low deviation. Therefore, the findings showed that Al 2 O 3 and CeO 2 hybrid nanofluids were more efficient than using of both Al 2 O 3 and CuO hybrid nanofluids and any mono nanofluids contain the same nanoparticles. The maximum enhancement of thermal and exergy efficiency of using Al 2 O 3 and CeO 2 hybrid nanofluids was 1.09% and 1.03%, respectively, whereas it was enhanced by 167.8% and 200.7% for the Nusselt number and heat transfer coefficient, respectively. Also, the hybrid nanofluids have higher advantage over the mono nanofluids by presenting lower pressure drop values. Finally, the assessment of efficiency variation affected by thermal properties of the nanoparticle was presented under optimum temperature equal to 575 K.

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Section: Thermal Model Validationsupporting

confidence: 58%

“…Validation present model with literature experimental and numerical results[36,49] Validation model using mono and hybrid nanofluids[31] Effect of change volumetric flow rate on the base fluid thermal efficiency at different inlet temperatures…”

mentioning

confidence: 94%

Exergy and energy amelioration for parabolic trough collector using mono and hybrid nanofluids

Al–Oran

Lezsovits

Aljawabrah

2020

J Therm Anal Calorim

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“…Finally, Okonkwo et al [57] conducted an experimental study on the application of green-synthesized nanofluid (OLE-TiO 2 /water and BH-SiO 2 /water) with the maximum volume fraction of 0.05 vol. %.…”

Section: Experimental Studiesmentioning

confidence: 99%

Application of Nanofluids in Thermal Performance Enhancement of Parabolic Trough Solar Collector: State-of-the-Art

et al. 2019

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The present review paper aims to document the latest developments on the applications of nanofluids as working fluid in parabolic trough collectors (PTCs). The influence of many factors such as nanoparticles and base fluid type as well as volume fraction and size of nanoparticles on the performance of PTCs has been investigated. The reviewed studies were mainly categorized into three different types of experimental, modeling (semi-analytical), and computational fluid dynamics (CFD). The main focus was to evaluate the effect of nanofluids on thermal efficiency, entropy generation, heat transfer coefficient enhancement, as well as pressure drop in PTCs. It was revealed that nanofluids not only enhance (in most of the cases) the thermal efficiency, convection heat transfer coefficient, and exergy efficiency of the system but also can decrease the entropy generation of the system. The only drawback in application of nanofluids in PTCs was found to be pressure drop increase that can be controlled by optimization in nanoparticles volume fraction and mass flow rate.

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“…As per their findings, the maximum thermal efficiency obtained was 48.03% using the largest volume fraction for hybrid nanoparticles with water whereas the minimum thermal efficiency recorded was 29.97% using the smallest volume fraction of hybrid nanoparticles with water‐EG base fluid. Okonkwo et al investigated numerically the behavior of new hybrid particles (green‐synthesized) OLE‐TiO 2 and BH‐SiO 2 with water as base fluid using 3% volume fraction under different fluid inlet temperatures and different flow rates. Results showed that the thermal efficiency was enhanced by 0.073% and 0.077% when using OLE‐TiO 2 and BH‐SiO 2 , respectively, with increasing in heat transfer coefficient by 128% and 138%.…”

Section: Thermal Performance Improvement By Adding Nanoparticlesmentioning

confidence: 99%

An extensive review of various technologies for enhancing the thermal and optical performances of parabolic trough collectors

Abed

Afgan

2020

Int J Energy Res

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A wide range of engineering industrial applications require both the thermal and optical efficiencies of the system to be maximized with a reasonable low penalty for the friction factor and subsequently low losses in pressure. Among the family of concentrated solar power systems, parabolic trough collectors (PTCs), which have recently received significant attention, face similar challenges. The current work presents an extensive review of the PTC systems comparing recent and past technologies, which are widely being used to improve and enhance the thermal and optical efficiencies. Furthermore, the techniques used for single and two-phase flow modeling in numerical simulations, design variables, and experimental processes have been discussed in detail. The article also presents different numerical methods and analytical approaches of implementing the nonuniform solar distribution with different design parameters. Four main technologies are comprehensively addressed to effectively enhance the thermal performance of the PTCs; changing working heat transfer fluids, replacing the working fluids by nanofluids (single and hybrid) that have higher thermal-physical properties than those of base working fluids, inserting different tabulators with various design configurations, and finally combining the advantages of nanofluids and swirl generators in the same application. The article also critically summarizes the studies investigating the enhancement of thermal performance: use of novel design of PTCs and passive heat transfer enhancement techniques. Finally, a wide range of numerical and experimental studies are proposed for the future work related to the aforementioned main technologies. K E Y W O R D Sheat transfer enhancements, nanofluids, parabolic trough solar collectors, solar thermal energy, tabulators, thermal and optical performances

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Thermal performance analysis of a parabolic trough collector using water-based green-synthesized nanofluids

Cited by 87 publications

References 35 publications

Exergy and energy amelioration for parabolic trough collector using mono and hybrid nanofluids

Exergy and energy amelioration for parabolic trough collector using mono and hybrid nanofluids

Application of Nanofluids in Thermal Performance Enhancement of Parabolic Trough Solar Collector: State-of-the-Art

An extensive review of various technologies for enhancing the thermal and optical performances of parabolic trough collectors

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