Bidirectional reflection of semitransparent polytetrafluoroethylene (PTFE) sheets on a silver film
Abstract
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.
- Authors:
-
- Georgia Inst. of Technology, Atlanta, GA (United States)
- Publication Date:
- Research Org.:
- Georgia Institute of Technology, Atlanta, GA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- OSTI Identifier:
- 1594790
- Alternate Identifier(s):
- OSTI ID: 1580181
- Grant/Contract Number:
- SC0018369; CBET-1603761
- Resource Type:
- Accepted Manuscript
- Journal Name:
- International Journal of Heat and Mass Transfer
- Additional Journal Information:
- Journal Volume: 148; Journal Issue: C; Journal ID: ISSN 0017-9310
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING; bidirectional reflectance distribution function; polytetrafluoroethylene; solar reflector; surface roughness; volume scattering
Citation Formats
Yang, Peiyan, and Zhang, Zhuomin M. Bidirectional reflection of semitransparent polytetrafluoroethylene (PTFE) sheets on a silver film. United States: N. p., 2019.
Web. doi:10.1016/j.ijheatmasstransfer.2019.118992.
Yang, Peiyan, & Zhang, Zhuomin M. Bidirectional reflection of semitransparent polytetrafluoroethylene (PTFE) sheets on a silver film. United States. https://doi.org/10.1016/j.ijheatmasstransfer.2019.118992
Yang, Peiyan, and Zhang, Zhuomin M. Thu .
"Bidirectional reflection of semitransparent polytetrafluoroethylene (PTFE) sheets on a silver film". United States. https://doi.org/10.1016/j.ijheatmasstransfer.2019.118992. https://www.osti.gov/servlets/purl/1594790.
@article{osti_1594790,
title = {Bidirectional reflection of semitransparent polytetrafluoroethylene (PTFE) sheets on a silver film},
author = {Yang, Peiyan and Zhang, Zhuomin M.},
abstractNote = {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.},
doi = {10.1016/j.ijheatmasstransfer.2019.118992},
journal = {International Journal of Heat and Mass Transfer},
number = C,
volume = 148,
place = {United States},
year = {Thu Nov 14 00:00:00 EST 2019},
month = {Thu Nov 14 00:00:00 EST 2019}
}
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