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High albedo daytime radiative cooling for enhanced bifacial PV performance

Authors :
Kim Hannah
Gao Yiwei
Moran Ethan
Howle Annyn
McSherry Sean
Cira Spencer
Lenert Andrej
Source :
Nanophotonics, Vol 13, Iss 5, Pp 621-627 (2023)
Publication Year :
2023
Publisher :
De Gruyter, 2023.

Abstract

We present a radiative cooling material capable of enhancing albedo while reducing ground surface temperatures beneath fielded bifacial solar panels. Electrospinning a layer of polyacrylonitrile nanofibers, or nanoPAN, onto a polymer-coated silver mirror yields a total solar reflectance of 99 %, an albedo of 0.96, and a thermal emittance of 0.80. The combination of high albedo and high emittance is enabled by wavelength-selective scattering induced by the hierarchical morphology of nanoPAN, which includes both thin fibers and bead-like structures. During outdoor testing, the material outperforms the radiative cooling power of a state-of-the-art control by ∼20 W/m2 and boosts the photocurrent produced by a commercial silicon cell by up to 6.4 mA/cm2 compared to sand. These experiments validate essential characteristics of a high-albedo radiative-cooling reflector with promising potential applications in thermal and light management of fielded bifacial panels.

Details

Language :
English
ISSN :
21928614
Volume :
13
Issue :
5
Database :
Directory of Open Access Journals
Journal :
Nanophotonics
Publication Type :
Academic Journal
Accession number :
edsdoj.914549cecc7e463a8f2ce5ed26aeca34
Document Type :
article
Full Text :
https://doi.org/10.1515/nanoph-2023-0611