Parabolic trough solar collector for low enthalpy processes: An analysis of the efficiency enhancement by using twisted tape inserts

Jaramillo, O.A.; Borunda, Mónica; Velazquez-Lucho, K.M.; Robles, Miguel

doi:10.1016/j.renene.2016.02.046

Cited by 184 publications

(51 citation statements)

References 36 publications

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“…[27] shows that the use of wall-detached twisted tape inserts lead to thermal efficiency enhancements up to 5% and the Ref. [28] indicates that the use of the twisted tape inserts leads to thermal efficiency enhancements up to 3%. Two recent studies [41,42] about the use of internal fins lead up to 1% thermal efficiency enhancement.…”

Section: Discussionmentioning

confidence: 99%

“…Mwesigye et al [27] examined the use of wall-detached twisted tape inserts and they found that this method leads to 2.7 times greater Nusselt number and to 5% increase in thermal efficiency. Jaramillo et al [28] found that the twisted tape inserts lead to 190% increase in the Nusselt number with 3% thermal efficiency enhancement. Too and Benito [29] conducted a comparative analysis of twisted tape insert, helical coil/wire insert, dimpled tube and porous foam inside a PTC operating with air, helium and carbon dioxide.…”

Section: Introductionmentioning

confidence: 99%

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Assessment of the thermal enhancement methods in parabolic trough collectors

Bellos

Tzivanidis

2017

Int J Energy Environ Eng

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Parabolic trough collector is an emerging solar technology for achieving the sustainability. Numerous studies have been focused on their performance evaluation and many techniques have been suggested for improving their thermal efficiency. The objective of this paper is to determine the impact of various thermal enhancement techniques on the thermal efficiency improvement of the PTC. The most usual techniques for increasing the thermal performance of parabolic trough collectors are the use of inserts, internal fins, metallic foams and the dimpled absorbers. A parametric analysis is conducted using different values of the thermal enhancement ratio (Nusselt number to the Nusselt number of the smooth absorber case). According to the final results, the thermal efficiency enhancement can reach up to 2% when the Nusselt number is about 2.5 times greater compared to the reference case and the inlet temperature is equal to 600 K. Moreover, in this case, the thermal losses are approximately 22% lower than in the respective reference case. For higher Nusselt number ratios, the thermal enhancement presents relatively small increase. This analysis is performed with a developed thermal model in Engineering Equation Solver (EES) which is validated with the literature results.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Assessment of the thermal enhancement methods in parabolic trough collectors

Bellos

Tzivanidis

2017

Int J Energy Environ Eng

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“…Heat transfer enhancement in the receiver tube was obtained by O.A. Jaramillo and Monica Borunda [63] by using twisted tape inserts into the receiver tube whereas Sh. Ghadirijafarbeigloo and A. H. Zamzamianb [64] obtained heat transfer enhancement through louvered twisted tape inserts into the receiver tube.…”

Section: Application Of Passive Techniques In Solar Trough Collectorsmentioning

confidence: 99%

Review on Recent Progresses in Heat Transfer Enhancement Through the Use of Passive Vortex Generators and Its Applications in Solar Parabolic Trough Systems

2017

IJAERD

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“…Khanna and Sharma [18] showed the circumferential temperature distribution of the absorber tube of a CPC. Jaramillo et al [19] found that the thermal performance significantly improves with twisted tape inserts in the absorber tube. Liang et al [20] used the Monte Carlo Method to analyze the solar flux distribution on the receiver and the optical thermal performance of the parabolic trough collector.…”

Section: Introductionmentioning

confidence: 99%

Performance Study of a Cylindrical Parabolic Concentrating Solar Water Heater with Nail Type Twisted Tape Inserts in the Copper Absorber Tube

2018

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This paper reports the overall thermal performance of a cylindrical parabolic concentrating solar water heater (CPCSWH) with inserting nail type twisted tape (NTT) in the copper absorber tube for the nail twist pitch ratios, 4.787, 6.914 and 9.042, respectively. The experiments are conducted for a constant volumetric water flow rate and during the time period 9:00 a.m. to 15:00 p.m. The useful heat gain, hourly solar energy collected and hourly solar energy stored in this solar water heater were found to be higher for the nail twist pitch ratio 4.787. The above said parameters were found to be at a peak at noon and observed to follow the path of variation of solar intensity. At the start of the experiment, the value of charging efficiency was observed to be maximal, whereas the maximum values of instantaneous efficiency and overall thermal efficiency were observed at noon. The key finding is that the nail twist pitch ratio enhances the overall thermal performance of the CPCSWH.

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Parabolic trough solar collector for low enthalpy processes: An analysis of the efficiency enhancement by using twisted tape inserts

Cited by 184 publications

References 36 publications

Assessment of the thermal enhancement methods in parabolic trough collectors

Assessment of the thermal enhancement methods in parabolic trough collectors

Review on Recent Progresses in Heat Transfer Enhancement Through the Use of Passive Vortex Generators and Its Applications in Solar Parabolic Trough Systems

Performance Study of a Cylindrical Parabolic Concentrating Solar Water Heater with Nail Type Twisted Tape Inserts in the Copper Absorber Tube

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