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 language | English |
|---|---|
| Article number | 1604 |
| Journal | Energies |
| Volume | 15 |
| Issue number | 5 |
| DOIs | |
| State | Published - 1 Mar 2022 |
| Externally published | Yes |
UN SDGs
This output contributes to the following UN Sustainable Development Goals (SDGs)
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SDG 7 Affordable and Clean Energy
Keywords
- Carbon nanotubes
- Direct absorption solar collector
- Hybrid nanofluid
- Iron oxide
- Magnetic nanofluid
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