Thermal analysis of parabolic trough collector operating with mono and hybrid nanofluids

Bellos, Evangelos; Tzivanidis, Christos

doi:10.1016/j.seta.2017.10.005

Cited by 144 publications

(92 citation statements)

References 48 publications

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“…The developed model was compared with experimental results from Dudley et al [5], as well as with the results of a developed model in EES, as it has been presented in Refs [19][20][21][22][23][24][25] with details. Finally, it is found that the thermal efficiency is calculated with extremely low deviations up to 0.2%.…”

Section: Discussionmentioning

confidence: 99%

“…This model has been presented and validated in our previous literature studies [19][20][21][22][23][24][25][26], and is a suitable tool for this analysis. Practically, various sensitivity studies are performed in this section in order to check the model accuracy under different operating cases.…”

Section: Parametric Investigationmentioning

confidence: 95%

“…The present modeling is based on the modeling of Refs [19][20][21][22][23][24][25] where the basic energy balances on the receiver are performed. The equations of the present modeling are simpler expressions of the modeling of the Refs [19][20][21][22][23][24][25] which had been used in EES program.…”

Section: Mathematical Modelingmentioning

confidence: 99%

“…The equations of the present modeling are simpler expressions of the modeling of the Refs [19][20][21][22][23][24][25] which had been used in EES program. Figure 1 depicts a typical parabolic trough collector.…”

Section: Mathematical Modelingmentioning

confidence: 99%

See 3 more Smart Citations

Analytical Expression of Parabolic Trough Solar Collector Performance

Bellos

Tzivanidis

2018

Designs

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Abstract:The parabolic trough collector is one of the most developed solar concentrating technologies for medium and high temperatures (up to 800 K). This solar technology is applied in many applications and so its investigation is common. The objective of this study is to develop analytical expressions for the determination of the thermal performance of parabolic trough collectors. The non-linear equations of the energy balances in the parabolic trough collector device are simplified using suitable assumptions. The final equation set includes all the possible parameters which influence the system performance and it can be solved directly without computational cost. This model is validated using experimental literature results. Moreover, the developed model is tested using another model written in Engineering Equation Solver under different operating conditions. The impact of the inlet fluid temperature, flow rate, ambient temperature, solar beam irradiation, and the heat transfer coefficient between cover and ambient are the investigated parameters for testing the model accuracy. According to the final results, the thermal efficiency can be found with high accuracy; the deviations are found to be up to 0.2% in the majority of the examined cases. Thus, the results of this work can be used for the quick and accurate thermal analysis of parabolic trough collector. Moreover, the analytical expressions give the possibility for optimizing solar thermal systems driven by parabolic trough collectors with lower computational cost.

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Section: Discussionmentioning

confidence: 99%

Section: Parametric Investigationmentioning

confidence: 95%

Section: Mathematical Modelingmentioning

confidence: 99%

Section: Mathematical Modelingmentioning

confidence: 99%

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Analytical Expression of Parabolic Trough Solar Collector Performance

Bellos

Tzivanidis

2018

Designs

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“…The validation procedure regards both the evacuated and the non-evacuated absorbers, and it is conducted for the thermal efficiency and the thermal losses. Moreover, it is important to state that a similar thermal model has been applied in our previous works [50][51][52][53][54][55][56][57], so the present methodology is an acceptable one. The modeling of the thermal enhancement methods is performed using literature equations about the Nusselt number and the friction factor for studies about PTC.…”

Section: The Examined Solar Collectormentioning

confidence: 99%

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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