Energy and exergy analysis of a parabolic trough collector using helically corrugated absorber tube

Akbarzadeh, Sanaz; Valipour, Mohammad Sadegh

doi:10.1016/j.renene.2020.03.127

Cited by 62 publications

(26 citation statements)

References 24 publications

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“…23 Bozorg et al 79 presented a CFD investigation of receiver tube provided with annular porous structure, which uses Al 2 O 3 -Synthetic oil as working fluid. The impact of the simultaneous usage of the porous structure and the introduction of nanoparticles on heat transfer, pressure drop and thermal efficiency of the receiver is examined for different Reynolds number, nanoparticle 73 ; B, Helical corrugated tube 74 ; C, Asymmetric outward convex corrugated tube 75 [Colour figure can be viewed at wileyonlinelibrary.com] volume fraction, inlet temperature and Darcy number values. The results showed that for Reynolds number higher than 30 × 10 4 , Darcy number equals to 0.3; heat transfer coefficient increases by 20% and 7%, pressure drop increases by 42% and 42.5%, thermal efficiency reaches upto 15% and 8%, exergy efficiency reaches upto 15% and 7% for inlet temperatures of 600 and 500 K respectively.…”

Section: Use Of Nanofluidsmentioning

confidence: 99%

A review on passive methods for thermal performance enhancement in parabolic trough solar collectors

Sharma

Jilte

2020

Intl J of Energy Research

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Among the diverse renewable energy sources available, solar energy harnessing has become very common in most countries. Various collectors were developed, built and checked to work in various temperature ranges. The parabolic trough solar collector is found to be the most common among the other collectors in applications such as the distribution of process heat and the production of steam. The heat collector part known as receiver tube is one of the key practical devices of parabolic trough solar collector. Numerous research studies have centered on receiver tube to raise its thermal potential. The usage of passive techniques such as provision of inserts in the receiver tube and geometrical changes of receiver tube are efficient strategies for increasing thermal performance. Detailed review of the numerical and experimental studies conducted on heat transfer enhancement strategies that rely on the use of inserts with the use of different working fluids in a parabolic trough solar collector's receiver tube is described in this article. Additionally heat transfer enhancement due to geometrical modification of receiver tube is also presented. Further, on the basis of literature survey, a comparison among various strategies is outlined. These studies show that future work in this area, that is, usage of passive techniques in parabolic trough solar collector will offer further growth.

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Section: Use Of Nanofluidsmentioning

confidence: 99%

A review on passive methods for thermal performance enhancement in parabolic trough solar collectors

Sharma

Jilte

2020

Intl J of Energy Research

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“…In order to increase the heat transfer conditions and make flow more turbulent, modified convergent‐divergent geometry of tube is required. This variation improves the heat transfer conditions that will subsequently lead to the higher useful energy gain by reducing the circumferential temperature of the absorber tube 19,42,45 . Figure 2C represents the converging‐diverging PTC absorber tube with inner diameter across “ x ” direction.…”

Section: Thermodynamic Analysismentioning

confidence: 99%

“…This variation improves the heat transfer conditions that will subsequently lead to the higher useful energy gain by reducing the circumferential temperature of the absorber tube. 19,42,45 Figure 2C represents the converging-diverging PTC absorber tube with inner diameter across "x" direction. It is worthy to mention that the geometry play a vital role in augmenting the heat transfer rate.…”

Section: Flow Analysis For Smooth Absorber Tubementioning

confidence: 99%

“…Equations (44) and (45) are used to evaluate the performance evaluation criterion (PECI and PECII) at same pumping power and same pressure drop conditions, respectively. The flow is considered to be enhanced if the value of these criteria is more than 1, means higher values suggest more enhancement.…”

Section: Inlet Tempertaure [K] Performance Evaluation Criterion IImentioning

confidence: 99%

“…Kareem et al 44 examined spirally corrugated tubes experimentally and numerically and proved that the sufficient enhancement in HTC is related to the pressure drop in the tube. Akbarzadeh and Valipour 45 investigated the effect of roughness, height to diameter ratio and pitch to diameter ratio on the energy and exergy efficiencies of the corrugated tubes of the PTC. It was revealed that both the efficiencies of the PTC increased as pitch ratio decreased.…”

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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Nanofluids in Solar Thermal Parabolic Trough Collectors (PTCs)

Dehghan

Akbarzadeh

Valipour

et al. 2023

Nanotechnology Applications for Solar Energy Systems

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Energy and exergy analysis of a parabolic trough collector using helically corrugated absorber tube

Cited by 62 publications

References 24 publications

A review on passive methods for thermal performance enhancement in parabolic trough solar collectors

A review on passive methods for thermal performance enhancement in parabolic trough solar collectors

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

Nanofluids in Solar Thermal Parabolic Trough Collectors (PTCs)

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