A dual-layer structure with record-high solar reflectance for daytime radiative cooling
By Peiyan Yang, Chuyang Chen, Zhuomin M. Zhang. Solar Energy, 2018
156 citations recorded by the source corpus.
Abstract We demonstrate a diffusive solar reflector with record-high reflectance when integrated over the wavelength region from 0.28 to 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 0.24 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, the proposed structure holds promise for passive daytime radiative cooling.
Subfields: Building and Construction, Civil and Structural Engineering, Environmental Engineering
View Paper: https://www.semanticscholar.org/paper/f10519caebc45c9d03a3e5cba4d04cc2a98fa43c
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Citations in the corpus
- Full Daytime Sub-ambient Radiative Cooling in Commercial-like Paints with High Figure of Merit (2020, background): “27 Other non-paint daytime radiative cooling solutions include a polymer-metal dual layer, 28,29 a silica nanocom-posite-metal dual layer, 30 a silica-metal dual layer, 31 and delignified wood.”
- A strategy of hierarchical particle sizes in nanoparticle composite for enhancing solar reflection (2019, background): “Strategies for achieving ultra-high solar reflectance are needed [13].”