Experimental investigation on a solar parabolic trough collector for absorber tube filled with porous media

Jamal-Abad, Milad Tajik; Saedodin, Seyfolah; Aminy, Mohammad

doi:10.1016/j.renene.2017.02.004

Cited by 153 publications

(35 citation statements)

References 21 publications

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“…Similar results were found by Sahin et al [21]. The use of metal foams have been investigated by Jamal-Abad et al [22] and it is found to be a 3% thermal efficiency enhancement with 20 times greater friction factor. Moreover, Wang et al [23] found seven times greater Nusselt number and 16 times greater friction factor with metal foams.…”

Section: Introductionsupporting

confidence: 80%

Enhancing the Performance of Evacuated and Non-Evacuated Parabolic Trough Collectors Using Twisted Tape Inserts, Perforated Plate Inserts and Internally Finned Absorber

Bellos

Tzivanidis

2018

Energies

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Abstract:The thermal enhancement of parabolic trough collectors is a critical issue and numerous ideas have been applied in the literature on this domain. The objective of this paper is to investigate some usual thermal enhancement techniques for improving the performance of evacuated and non-evacuated receivers of parabolic trough solar collectors. More specifically, the use of twisted tape inserts, perforated plate inserts, and internally finned absorbers are compared with the reference case of the smooth absorber. The analysis is conducted with a developed and validated thermal model in Engineering Equation Solver. The collector is investigated for a typical flow rate of 100 L/min and for inlet temperatures between 50 • C and 350 • C with Syltherm 800 as working fluid. According to the final results, the use of internally finned absorber leads to the highest thermal efficiency enhancement, which is up to 2.1% for the non-evacuated collector and up to 1.6% for the evacuated tube collector. The perforated plate inserts and the twisted tape inserts were found to lead to lower enhancements, which are up to 1.8% and 1.5%, respectively, for the non-evacuated collector, while they are up to 1.4% and 1.2%, respectively, for the evacuated collector. Moreover, the pressure drop increase with the use of the thermal enhancement methods is investigated and the use of internally finned absorber is found again to be the superior technique with the performance evaluation criterion to be ranged from 1.5 to 1.8 for this case.

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Section: Introductionsupporting

confidence: 80%

Enhancing the Performance of Evacuated and Non-Evacuated Parabolic Trough Collectors Using Twisted Tape Inserts, Perforated Plate Inserts and Internally Finned Absorber

Bellos

Tzivanidis

2018

Energies

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“…Reddy et al [13], Jamal-Abad et al [14], Ghasemi and Ranjbar [15] and Wang et al [16] have used different porous media and justified its role in the heat transfer augmentation. Apart from above mentioned techniques, other receiver surface treatment techniques were discussed by Fuqiang et al [17], [18] and Jianseng et al [19].…”

Section: Literature Reviewmentioning

confidence: 99%

Twisted Tape Based Heat Transfer Enhancement In Parabolic Trough Concentrator – An Experimental study

Elton

Arunachala

2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Heat transfer at boiling of refrigerants in channels with twisted tape insert A V Shishkin, S E Tarasevich and A B Yakovlev Abstract. The heat transfer augmentation in parabolic trough concentrator is gaining importance now a days as it makes the system compact and efficient. Out of various techniques, use of twisted tape inserts is popular due to easy implementation as well as substantial enhancement in system performance. Most of the studies in this field pertaining to experimental/computational analysis with respect to both outdoor and indoor set ups. The rise in convective coefficient of heat transfer fluid due to insert has been studied by many researchers. But such studies are based on uniform heat flux or out-field non-uniform based which is under uncontrollable environment. Hence in the present study, Nusselt number correlations for plain absorber and absorber with twisted tape (y=3.48, 5.42 and 7.36) are developed under the realistic condition of solar concentration with controlled environment. The parity plot shows the maximum deviation of 20% which in turn indicates better quality of fit. IntroductionSolar energy has been used by both nature and human kind throughout time in many ways. It is used to heat and cool buildings (both actively and passively), heat water for domestic and industrial uses, heat swimming pools, power refrigerators, operate engines and pumps, desalinate water for drinking purposes, generate electricity, for chemistry applications, and many more operations. Because of the desirable environmental and safety aspects it is widely believed that solar energy should be utilized instead of other conventional energy forms. Out of different applications of solar energy, the power generation by focusing type of collectors is gaining popularity now a days. Parabolic trough power plants consist of large field of parabolic trough collectors (PTC), a heat transfer fluid/steam generation system, a Rankine steam turbine/generator cycle, and optional thermal storage and/or fossil-fired backup systems. The performance of PTC is based on optical and thermo-hydraulic configuration. Due to advanced optics technology presently in use, researchers have focused on performance enhancement of receivers taking into account various geometrical treatments.

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“…The results showed that pressure drop and drag coefficients decreased with increase in Darcy number. Tajik et al [24] investigated the effect of metal foam with the porosity of 0.9 in an absorber tube of a PTC (Parabolic Trough Collector). They demonstrated that the overall loss coefficient was decreased by 45%.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of efficiency enhancement in a direct absorption parabolic trough collector occupied by a porous medium and saturated by a nanofluid

Tayebi

Akbarzadeh

Valipour

2018

Env Prog and Sustain Energy

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In this study, a numerical investigation of the solar parabolic trough collector with an area of 0.856 m2 by combination of Monte Carlo Ray‐Trace (MCRT) and finite volume method (FVM) has been carried out using the FLUENT software. The purpose of this study is to investigate the effect of metal foams and nanofluids on the thermal performance of a direct absorption parabolic trough collector (DAPTC). For this purpose, three‐dimensional fully developed laminar convection heat transfer of Al2O3 and TiO2/water nanofluids is examined by 0.1, 0.2, and 0.3 vol %. Furthermore, 64 cm copper‐filled porous media in a volumetric absorbent tube are applied. The obtained results of numerical simulations are compared with the experimental data. The results demonstrate a good agreement between the numerical simulations and experimental data. The results indicate that the maximum efficiency was 34.51% for TiO2/water at 0.3 vol %. Furthermore, using porous media with high absorption coefficient and scattering coefficient that could absorb more incoming radiation and transfer to heat transfer fluid can result in increasing the efficiency of the collector. © 2018 American Institute of Chemical Engineers Environ Prog, 38: 727–740, 2019

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Experimental investigation on a solar parabolic trough collector for absorber tube filled with porous media

Cited by 153 publications

References 21 publications

Enhancing the Performance of Evacuated and Non-Evacuated Parabolic Trough Collectors Using Twisted Tape Inserts, Perforated Plate Inserts and Internally Finned Absorber

Enhancing the Performance of Evacuated and Non-Evacuated Parabolic Trough Collectors Using Twisted Tape Inserts, Perforated Plate Inserts and Internally Finned Absorber

Twisted Tape Based Heat Transfer Enhancement In Parabolic Trough Concentrator – An Experimental study

Numerical investigation of efficiency enhancement in a direct absorption parabolic trough collector occupied by a porous medium and saturated by a nanofluid

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