The evolution of nanofluids over the years has opened new research opportunities in the field of renewable energy. Research on the optical properties of nanofluids for application in direct absorption solar collectors (DASCs) is progressing at a burgeoning speed. In a DASC system, nanofluid with high optical absorptivity can convert the incident solar energy into the thermal energy of the fluid. The dispersed nanoparticles in the fluid act in the process through the phenomenon of absorption and scattering. Studies conducted on the optical property characterization of monocomponent nanofluids have become saturated. Moreover, the photothermal efficiency (PTE) of the nanofluid can be enhanced by using multicomponent nanofluids. Nanofluids prepared using varying materials, shapes and sizes of nanoparticles can tune the absorption spectra of the bulk fluid to improve the PTE. A hybrid nanocomposite can similarly enhance the absorptivity due to the synergy of materials present in the nanocomposite particle. In this review, a comprehensive survey on the synthesis and optical characterization of different monocomponent, blended and hybrid nanocomposite nanofluids has been performed.
Bibliographical noteFunding Information:
The authors thank Ulster University for supporting this research through PhD studentship funding from the Northern Ireland Department for the Economy. The authors also acknowledge the support of the Built Environment Research Institute (BERI) and Nanotechnology and Integrated Bio-engineering Centre (NIBEC), Ulster University.
© 2022 The Author(s). Published by IOP Publishing Ltd.
- Hybrid nanofluid
- belnded nanofluid
- solar weighted absorption fraction
- photothermal conversion efficiency
- hybrid nanofluid
- blended nanofluid