Comparative thermal performance of a parabolic trough receiver with Cu-therminol®VP-1, Ag-therminol®VP-1 and Al2O3 - Therminol®VP-1 nanofluids

Aggrey Mwesigye, Zhongjie Huan, Josua P. Meyer

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations

Abstract

As parabolic trough systems with high concentration ratios become feasible, convective heat transfer enhancement is expected to play a significant role in improving the thermal and thermodynamic performance of these systems. In this paper, the thermal performances of a high concentration ratio system using three different types of nanofluids were investigated. A system with a geometric concentration ratio of 113 and a rim angle of 80o was used in this study. The nanofluids considered were copper-Therminol®VP-1, silver-Therminol®VP-1 and Al2O3- Therminol®VP-1 nanofluid. For each nanofluid, the volume fraction of the nanoparticles in the base fluid was varied from 0-6%. The numerical solution was obtained using a finite volume based computational fluid dynamics tool. Temperature dependent properties were used for both the base fluid and the nanoparticles. An actual receiver heat flux boundary condition obtained using Monte Carlo ray tracing was coupled to the computational fluid dynamics code to model the thermal performance of the receiver. Results show that for each nanofluid used, the thermal performance of the receiver improves significantly. The thermal efficiency increases by about 12.5%, 13.9% and 7.2% for the copper-Therminol®VP- 1, silver-Therminol®VP-1 and Al2O3-Therminol®VP-1 nanofluids, respectively as the volume fraction increases from 0 to 6%. The thermal efficiency improvement with silver- Therminol®VP-1 was the highest of the considered nanofluids owing to the relatively higher thermal conductivity of silver.

Original languageEnglish (US)
Title of host publicationHeat Transfer and Thermal Engineering
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791850626
DOIs
StatePublished - Jan 1 2016
Externally publishedYes
EventASME 2016 International Mechanical Engineering Congress and Exposition, IMECE 2016 - Phoenix, United States
Duration: Nov 11 2016Nov 17 2016

Publication series

NameASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)
Volume8

Conference

ConferenceASME 2016 International Mechanical Engineering Congress and Exposition, IMECE 2016
CountryUnited States
CityPhoenix
Period11/11/1611/17/16

Keywords

  • Concentration ratio
  • Nanofluid
  • Parabolic trough receiver
  • Ray tracing
  • Thermal efficiency

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