Effect of various multiple strip inserts and nanofluids on the thermal–hydraulic performances of parabolic trough collectors

•Thermal and Thermodynamics performances of parabolic trough collectors.•Computational fluid dynamics.•Heat transfer analysis and enhancement using nanofluids.•Non-uniform heat flux distribution using Monte Carlo Ray Tracing.•Various swirl generators thermal enhancements. The thermal performance of...

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Bibliographic Details
Published in:Applied thermal engineering 2022-01, Vol.201, p.117798, Article 117798
Main Authors: Abed, Nabeel, Afgan, Imran, Cioncolini, Andrea, Iacovides, Hector, Nasser, Adel
Format: Article
Language:English
Subjects:
Accumulators
Configurations
Exergy
External walls
Fluid dynamics
Fluid flow
Heat conductivity
Heat transfer
Hydraulics
Inserts
Loss reduction
Nanofluids
Nanoparticles
Non-uniform heating
Parabolic solar trough collectors
Silicon dioxide
Solar collectors
Solar thermal energy
Strip
Swirl generators
Temperature
Thermal and hydraulic performances
Thermodynamic efficiency
Working fluids
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Summary:•Thermal and Thermodynamics performances of parabolic trough collectors.•Computational fluid dynamics.•Heat transfer analysis and enhancement using nanofluids.•Non-uniform heat flux distribution using Monte Carlo Ray Tracing.•Various swirl generators thermal enhancements. The thermal performance of the parabolic trough collectors can be improved by the use of swirl generator inserts added to the solar receiver. These inserts help improve the energy capture from the internal receiver walls and reduce the external wall thermal losses. If nanoparticles are added to the heat transfer fluid of the solar receiver tube, then this also increases the output working fluid temperature thereby reducing the outer wall’s temperature. The main objective of the current study is to assess the effect of various straight strip shapes with and without nanofluids. Four different strip arrangements were considered; large conical-shape strips, small conical-shape strips, rectangular-shape strips and elliptical-shape strips. All of these configurations were then also tested in 6% of SiO2 nanoparticles mixed in Therminol® VP-1 (TO) forming the nanofluid. Results showed that the straight large conical strips lead to the maximum enhancement in the Nusselt number (up to 57.49% for the pure base fluid and up to 62.53% for the nanofluid). The thermal efficiency improvement for this optimal configuration with nanofluid was found to be 15.41% with a thermal loss reduction of around 26%. A similar trend was found for the thermal exergy efficiency which showed an improvement of 15.32% for this optimal configuration with the use of nanofluid.
ISSN:1359-4311
1873-5606
DOI:10.1016/j.applthermaleng.2021.117798