Numerical simulations of a parabolic trough solar collector with nanofluid using a two-phase model

Kaloudis, Efstathios; Papanicolaou, E.; Belessiotis, V.

doi:10.1016/j.renene.2016.05.046

Cited by 154 publications

(48 citation statements)

References 35 publications

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“…Kaloudis, et al [70] conducted a CFD simulation to investigate the effect of different volume fraction (0.5-4%) of Al 2 O 3 in Al 2 O 3 /syltherm 800 nanofluid on PTC performance. They used two different modeling for nanofluid: two-phase simulation and one phase simulation.…”

Section: Investigationsmentioning

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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Section: Investigationsmentioning

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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“…Mwesigye and Mayer [8] conducted the study with using Ag-Therminol VP-1, Cu-Therminol VP-1 and Al2O3-Therminol VP-1 nanofluids, they have been shown that the thermal efficiency increases by 13.9%, 12.5%, and 7.2%, respectively, when the nanofluid volumetric ratio is increased from 0 to 6%. Kaloudis et al [9] showed that Syltherm 800 / Al2O3 nanofluid at the concentration 4% increased the collector efficiency by 10% with using the two-phase method.…”

Section: Introductionmentioning

confidence: 99%

Investigation of energetic and exergetic performances of parabolic trough collector with using different heat transfer fluids

Arslan

Günerhan

2019

E3S Web Conf.

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In this study energetic and exergetic performances of parabolic trough collector is theoretically investigated by using 120 l/min synthetic ‘’Dowtherm A’’ oil , 1200 l/min Air at 100 bar (10 MPa) and 150 l/min molten salt which is mixture of 60 wt% sodium nitrate (NaNO3) and 40 wt% potassium nitrate (KNO3) which are widely used as heat transfer fluids. Fluids performance comparisons were performed with the LS-2 module, which is used with vacuum in annulus and Cermet as a selective coating. LS-2 module has 7.8 m receiver length and is 39 m2 aperture area. As a result, the maximum exergy efficiency of the molten salt, synthetic oil, Air to be 41.19% at 422 °C, 40.82% at 400 °C, 40.33% at 402 °C, respectively. The maximum exergy of air is higher than other working fluids up to 310 ° C but after about 310 ° C the exergy of the molten salt is higher than the others. The molten salt has the best energy efficiency at its operating temperatures (250 °C to 550 °C) than other working fluids.

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“…Their results yielded good agreement with Jeter . Moreover, Kaloudis et al represented the approximated LCR by using 7‐curve fitting equations compared with the MCRT model suggested by Cheng et al The curves generated are third degree polynomial functions in a form of: LCR = b 3 ∅ 3 + b 2 ∅ 2 + b 1 ∅ + b 0 , where ∅ is an absorber angle and b 3 , b 2 , b 1 , b 0 are constants have different values depending on the range of the absorber angle, given in Table .…”

Section: Literature Review Of Ptcsmentioning

confidence: 98%

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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Numerical simulations of a parabolic trough solar collector with nanofluid using a two-phase model

Cited by 154 publications

References 35 publications

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

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

Investigation of energetic and exergetic performances of parabolic trough collector with using different heat transfer fluids

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

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