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US 10,502,505 B2Granted
Radiative cooling structures and systems
AssigneesThe Regents of the Univeristy of Colorado, a body corporate, University of Wyoming
InventorsRonggui Yang, Xiaobo Yin, Gang Tan, Dongliang Zhao, Yaoguang Ma, Yao Zhai
Life of this patent
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Abstract
Polymer-based selective radiative cooling structures are provided which include a selectively emissive layer of a polymer or a polymer matrix composite material. Exemplary selective radiative cooling structures are in the form of a sheet, film or coating. Also provided are methods for removing heat from a body by selective thermal radiation using polymer-based selective radiative cooling structures.
Claims20
A selective radiative cooling structure, the structure comprising:
- a selectively emissive layer comprising a polymer and a plurality of dielectric particles dispersed in the polymer, the volume percentage of the dielectric particles in the selectively emissive layer selected from the range of 1% to 25% and the particles characterized by an average size ranging from 3 μm to 30 μm;
- a reflective layer comprising a metal film or metal substrate, wherein the selectively emissive layer is provided on the reflective layer;
- wherein the selective radiative cooling structure is characterized by an average emissivity ranging from 0.6 to 1.0 over the wavelength range 7 μm to 13 μm;
- wherein the selectively emissive layer has a transmissivity of 0.7 to 1 over a solar wavelength range of 0.3 μm to 3 μm;
- wherein the polymer is selected from the group consisting of polymethyl methacrylate (PMMA), polyethylene terephthalate (PET), a 4-methyl-1-pentene polymer, a 4-methyl-1-pentene copolymer and polyvinyl fluoride;
- wherein the dielectric particles comprise silicon dioxide (SiO2);
- and
- wherein the reflective layer is a silver film characterized by an average thickness from 20 nanometers to 300 nanometers.
5 more elements
Dependencies are inferred from the claim text.