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- Title
Significant Solar Thermal Conversion Properties of Ethylene Glycol Nanofluids Enhanced by Carbon Chain Nanostructures.
- Authors
Wang, Jiayao; Zhang, Wei; Wu, Daxiong; Zhang, Canying; Zhu, Haitao
- Abstract
Nanofluids are promising in solar harvesting and solar thermal utilization. Ethylene glycol (EG) nanofluids have the advantages of high boiling point and low volatility, and therefore are highly desired in some circumstances. In this study, the solar harvesting and solar thermal conversion properties of EG were significantly enhanced by carbon chain nanostructures (CCNSs). The prepared CCNSs/EG nanofluids showed greater optical absorption compared to EG in the wavelength range from 250 nm to 1400 nm. The solar weighted absorption factor (Am) of the CCNSs/EG nanofluids was 95.9% at the mass fraction of 0.05 wt.%. The enhancement was 649.2% compared to that of EG. The photothermal conversion efficiency was determined to be 97.7% and the enhancement of 83.0% was achieved. An enhancement of 1.2% in thermal conductivity was also been observed. These enhancements can be ascribed to the special architectures of the CCNSs that provide fast transfer path for the generated heat. Carbon chain nanostructures in the current work are cheap and available in large scale. They have not only broad absorption band and high absorbance in solar spectrum, but also fast heat transfer paths along the chains. Therefore, the solar absorption, solar thermal conversion and heat conduction of the ethylene glycol nanofluids were enhanced remarkably by the carbon chain nanostructures.
- Subjects
SOLAR thermal energy; NANOFLUIDS; THERMAL properties; PHOTOTHERMAL conversion; SOLAR spectra; ETHYLENE glycol
- Publication
NANO, 2022, Vol 17, Issue 4, p1
- ISSN
1793-2920
- Publication type
Article
- DOI
10.1142/S1793292022500333