Bidirectional reflection of semitransparent polytetrafluoroethylene (PTFE) sheets on a silver film

Yang, Peiyan; Zhang, Zhuomin M.

doi:10.1016/j.ijheatmasstransfer.2019.118992

Title: Bidirectional reflection of semitransparent polytetrafluoroethylene (PTFE) sheets on a silver film

Journal Article · 14 November 2019 · International Journal of Heat and Mass Transfer

DOI: https://doi.org/10.1016/j.ijheatmasstransfer.2019.118992 · OSTI ID:1594790

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

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

In our recent work, record-high solar reflectance (exceeding 99%) has been demonstrated by placing a layer of highly scattering, semitransparent polytetrafluoroethylene (PTFE) sheet on top of a silver film. This can significantly improve the performance of daytime radiative cooling system. Although a PTFE slab of 10-mm thick acts as an excellent diffuse reflector, it is unclear how this dual-layer structure made of a thin PTFE on a mirror-like reflector will alter the bidirectional reflection. Here, we report measurements of the bidirectional reflectance distribution function (BRDF) of the dual-layer structure using a laser scatterometer at the wavelength of 635 nm. Measurements of the BRDF and the bidirectional transmittance distribution function (BTDF) of free-standing PTFE sheets are also performed. The measured BRDF for a PTFE sheet as thin as 236 μm on Ag is essentially diffuse except at large incidence angles. A Monte Carlo ray-tracing method incorporating both surface scattering and volumetric scattering is developed to theoretically model the BRDF in order to elucidate the underlying mechanisms. Finally, the numerical model captures the main features and can be used to study the bidirectional properties for PTFE sheets thinner than what is experimentally available.

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

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

Grant/Contract Number:: SC0018369; CBET-1603761

OSTI ID:: 1594790

Alternate ID(s):: OSTI ID: 1580181

Journal Information:: International Journal of Heat and Mass Transfer, Vol. 148, Issue C; ISSN 0017-9310

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 6 works

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Title: Bidirectional reflection of semitransparent polytetrafluoroethylene (PTFE) sheets on a silver film

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