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Hybrid Nanofluid in a Direct Absorption Solar Collector: Magnetite vs. Carbon Nanotubes Compete for Thermal Performance

  • Pavel G. Struchalin*
  • , Dmitrii M. Kuzmenkov
  • , Vladimir S. Yunin
  • , Xinzhi Wang
  • , Yurong He
  • , Boris V. Balakin
  • *Corresponding author for this work
  • Western Norway University of Applied Sciences
  • Moscow Engineering Physics Institute
  • School of Energy Science and Engineering, Harbin Institute of Technology

Research output: Contribution to journalArticlepeer-review

Abstract

The paper presents the experimental measurements of thermal efficiency of a tubular direct absorption solar collector (DASC) with a hybrid nanofluid based on magnetite (Fe3 O4) and multi-walled carbon nanotubes (MWCNT). The volumetric concentration of Fe3 O4 and MWCNT was 0.0053% and 0.0045%, respectively. The experiments were carried out for the flow rates of 2–10 L/min and a temperature difference up to 20 C between the environment and the DASC. The performance of the DASC with a hybrid nanofluid was in the range of 52.3–69.4%, which was just beyond the performance of the collector with surface absorption. It was also found that using a MWCNT-based nanofluid with an equivalent total volumetric concentration of particles (0.0091%), the efficiency was 8.3–31.5% higher than for the cases with the hybrid nanofluid.

Original languageEnglish
Article number1604
JournalEnergies
Volume15
Issue number5
DOIs
StatePublished - 1 Mar 2022
Externally publishedYes

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

  1. SDG 7 - Affordable and Clean Energy
    SDG 7 Affordable and Clean Energy

Keywords

  • Carbon nanotubes
  • Direct absorption solar collector
  • Hybrid nanofluid
  • Iron oxide
  • Magnetic nanofluid

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