Radiative cooling device having multilayer structure

Patent metadata

Field	Value
Publication number	US-11639832-B2
Application number	US-202017110479-A
Country	US
Kind code	B2
Filing date	Dec 3, 2020
Priority date	Aug 11, 2020
Publication date	May 2, 2023
Grant date	May 2, 2023

Abstract

The present disclosure relates to a technical idea of reducing the surface temperature of a material or temperature under a material by emitting heat under a device to the outside by absorbing and emitting long-wavelength infrared light corresponding to the wavelength range of the atmospheric window while minimizing absorption of light of the solar spectrum. More particularly, the present disclosure relates to a technology for providing a radiative cooling device having a multilayer structure that is capable of increasing sunlight reflection through differences in the refractive indexes of the device-forming materials while performing selective emission over the wavelength range of the atmospheric window using a radiative cooling device having a multilayer structure composed of polymers and inorganic materials.

First claim

What is claimed is:

1. A radiative cooling device having a multilayer structure, comprising:
a multilayer structure comprising at least one pair of at least one of an inorganic layer, a polymer layer, a composite inorganic layer, a composite polymer layer, and an inorganic material-polymer composite layer, and
a radiative cooling layer for absorbing and emitting infrared light in a wavelength range corresponding to an atmospheric window while reflecting sunlight based on the multilayer structure,
wherein the multilayer structure comprises at least one of a first structure in which the inorganic layer is laminated on the polymer layer and a polymer layer based on a polymer different from a polymer forming the polymer layer is laminated thereon, and a second structure in which the polymer layer is laminated on the inorganic layer and an inorganic layer based on an inorganic material different from an inorganic material forming the inorganic layer is laminated thereon.

2. The radiative cooling device according to claim 1 , wherein the multilayer structure comprises at least one of a third structure in which the inorganic layer is laminated on the polymer layer, a fourth structure in which the inorganic layer is laminated on the polymer layer and the polymer layer is laminated thereon, a fifth structure in which the polymer layer is laminated on the inorganic layer, and a sixth structure in which the polymer layer is laminated on the inorganic layer and the inorganic layer is laminated thereon.

3. The radiative cooling device according to claim 2 , wherein the multilayer structure comprises at least one of a third repeat structure in which the third structure is repeatedly laminated at least once, a fourth repeat structure in which the fourth structure is repeatedly laminated at least once, a fifth repeat structure in which the fifth structure is repeatedly laminated at least once, and a sixth repeat structure in which the sixth structure is repeatedly laminated at least once.

4. The radiative cooling device according to claim 1 , wherein the multilayer structure comprises at least one of a first repeat structure in which the first structure is repeatedly laminated at least once and a second repeat structure in which the second structure is repeatedly laminated at least once.

5. The radiative cooling device according to claim 1 , wherein the multilayer structure comprises at least one of a seventh structure in which the inorganic layer is laminated on the inorganic material-polymer composite layer and the inorganic material-polymer composite layer is laminated thereon, an eighth structure in which the inorganic layer is laminated on the inorganic material-polymer composite layer and an inorganic material-polymer composite layer comprising inorganic particles different from inorganic particles comprised in the inorganic material-polymer composite layer is laminated thereon, a ninth structure in which the inorganic layer is laminated on the inorganic material-polymer composite layer and an inorganic material-polymer composite layer based on a polymer different from a polymer forming the inorganic material-polymer composite layer is laminated thereon, a tenth structure in which the polymer layer is laminated on the composite inorganic layer and the inorganic material-polymer composite layer is laminated thereon, an eleventh structure in which the composite inorganic layer is laminated on the polymer layer and the polymer layer is laminated thereon, and a twelfth structure in which the inorganic layer is laminated on the composite polymer layer and the composite polymer layer is laminated thereon.

6. The radiative cooling device according to claim 5 , wherein the multilayer structure comprises at least one of a seventh repeat structure in which the seventh structure is repeatedly laminated at least once, an eighth repeat structure in which the eighth structure is repeatedly laminated at least once, a ninth repeat structure in which the ninth structure is repeatedly laminated at least once, a tenth repeat structure in which the tenth structure is repeatedly laminated at least once, an eleventh repeat structure in which the eleventh structure is repeatedly laminated at least once, and a twelfth repeat structure in which the twelfth structure is repeatedly laminated at least once.

7. The radiative cooling device according to claim 1 , wherein the inorganic layer is formed of at least one inorganic material of Al 2 O 3 , SiO 2 , BaSO 4 , LiF, CaSO 4 , ZnO, TiO 2 , ZrO 2 , CaF 2 , MgF 2 , HfO 2 , CaCO 3 , AlN, MgPHO 4 , and Si 3 N 4 .

8. The radiative cooling device according to claim 1 , wherein the polymer layer is formed of at least one polymer of polydimethyl siloxane (PDMS), polyurethane acrylate (PUA), polyvinylidene fluoride (PVDF), polyethylene terephthalate (PET), polyvinyl chloride (PVC), polyvinylidene fluoride (PVDF), dipentaerythritol hexaacrylate (DPHA), polymethyl methacrylate (PMMA), polybutyl methacrylate (PBMA), perfluoropolyether (PFPE), polycarbonate (PC), PTFE(Polytetrafluoroethylene), Spectralon, ETFE(Ethylene Tetra fluoro Ethylene), and polyethylene (PE).

9. The radiative cooling device according to claim 1 , wherein the inorganic material-polymer composite layer is formed of a mixture comprising at least one polymer of polydimethyl siloxane (PDMS), polyurethane acrylate (PUA), polyvinylidene fluoride (PVDF), polyethylene terephthalate (PET), polyvinyl chloride (PVC), polyvinylidene fluoride (PVDF), dipentaerythritol hexaacrylate (DPHA), polymethyl methacrylate (PMMA), polybutyl methacrylate (PBMA), perfluoropolyether (PFPE), polycarbonate (PC), PTFE(Polytetrafluoroethylene), Spectralon, ETFE(Ethylene Tetra fluoro Ethylene), and polyethylene (PE) and at least one inorganic material of Al 2 O 3 , SiO 2 , BaSO 4 , LiF, CaSO 4 , ZnO, TiO 2 , ZrO 2 , CaF 2 , MgF 2 , HfO 2 , CaCO 3 , AlN, MgPHO 4 , and Si 3 N 4 .

10. The radiative cooling device according to claim 1 , wherein the composite inorganic layer is formed by mixing any one first inorganic material selected from Al 2 O 3 , SiO 2 , BaSO 4 , LiF, CaSO 4 , ZnO, TiO 2 , ZrO 2 , CaF 2 , MgF 2 , HfO 2 , CaCO 3 , AlN, MgPHO 4 , and Si 3 N 4 and a second inorganic material selected from Al 2 O 3 , SiO 2 , BaSO 4 , LiF, CaSO 4 , ZnO, TiO 2 , ZrO 2 , CaF 2 , MgF 2 , HfO 2 , CaCO 3 , AlN, MgPHO 4 , and Si 3 N 4 , wherein the second inorganic material is different from the first inorganic material.

11. The radiative cooling device according to claim 1 , wherein the composite polymer layer is formed by mixing a first polymer selected from polydimethyl siloxane (PDMS), polyurethane acrylate (PUA), polyvinylidene fluoride (PVDF), polyethylene terephthalate (PET), polyvinyl chloride (PVC), polyvinylidene fluoride (PVDF), dipentaerythritol hexaacrylate (DPHA), polymethyl methacrylate (PMMA), polybutyl methacrylate (PBMA), perfluoropolyether (PFPE), polycarbonate (PC), PTFE(Polytetrafluoroethylene), Spectralon, ETFE(Ethylene Tetra fluoro Ethylene), and polyethylene (PE) and a second polymer selected from polydimethyl siloxane (PDMS), polyurethane acrylate (PUA), polyvinylidene fluoride (PVDF), polyethylene terephthalate (PET), polyvinyl chloride (PVC), polyvinylidene fluoride (PVDF), dipentaerythritol hexaacrylate (DPHA), polymethyl methacrylate (PMMA), polybutyl methacrylate (PBMA), perfluoropolyether (PFPE), polycarbonate (PC), PTFE(Polytetrafluoroethylene), Spectralon, ETFE(Ethylene Tetra fluoro Ethylene), and polyethylene (PE), wherein the second polymer is different from the first polymer.

12. The radiative cooling device according to claim 1 , further comprising a solar reflective layer formed of at least one of a metal material, at least one inorg

Assignees

• Univ Korea Res & Bus Found

Inventors

• Lee Heon
• Son Soomin
• Chae Dongwoo

Classifications

• Y02A30/272

  Solar heating or cooling · CPC title

• F28F2245/06

  having particular radiating, reflecting or absorbing features, e.g. for improving heat transfer by radiation · CPC title

• B32B9/00

  Layered products comprising a {layer of a} particular substance not covered by groups B32B11/00 - B32B29/00 · CPC title

• B32B2307/416

  Reflective · CPC title

• B32B9/045

  of synthetic resin · CPC title