A dual-layer structure with record-high solar reflectance for daytime radiative cooling

Yang, Peiyan; Chen, Chuyang; Zhang, Zhuomin M.

doi:10.1016/j.solener.2018.04.031

A dual-layer structure with record-high solar reflectance for daytime radiative cooling

Journal Article · Tue May 08 00:00:00 EDT 2018 · Solar Energy

DOI:https://doi.org/10.1016/j.solener.2018.04.031· OSTI ID:1594763

Yang, Peiyan ^[1]; Chen, Chuyang ^[2]; Zhang, Zhuomin M. ^[2]

Georgia Inst. of Technology, Atlanta, GA (United States); Georgia Institute of Technology
Georgia Inst. of Technology, Atlanta, GA (United States)

We demonstrate a diffusive solar reflector with record high reflectance when integrated over the wavelength region from 0.28-4.0 μm. The reflector has a dual-layer structure consisting of a polytetrafluoroethylene (PTFE) sheet on top of a silver film. The thickness of the PTFE varies from 0.25 mm to 1 mm. Spectral reflectance and transmittance of the PTFE sheets (with and without a silver film) were measured using a monochromator and a Fourier-transform infrared spectrometer, with integrating spheres, at wavelengths from 0.28 μm to 15 μm. The scattering and absorption coefficients of the PTFE samples were obtained by fitting the reflectance and transmittance spectra. Integration over the solar irradiation spectrum (AM1.5) reveals that the total solar reflectance is approximately 0.99 for the reflector. This is the highest solar reflectance reported to date. A Monte Carlo ray-tracing method and a modified two-flux model were used to calculate the reflectance and compare with the experiments to shed light on mechanisms for the high reflectance. Our measurements also suggest that PTFE has a high emittance around 0.9 in the mid-infrared region. Therefore, we conclude the proposed structure holds promise for passive daytime radiative cooling.

View Accepted Manuscript (DOE)

Research Organization:: Georgia Inst. of Technology, Atlanta, GA (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: SC0018369

OSTI ID:: 1594763

Alternate ID(s):: OSTI ID: 1693670

Journal Information:: Solar Energy, Journal Name: Solar Energy Journal Issue: C Vol. 169; ISSN 0038-092X

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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14 SOLAR ENERGY
Diffuse reflector
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