Radiative cooling systems
AssigneeSkyCool Systems, Inc.
InventorsAaswath Raman, Eli A. Goldstein, Shanhui Fan
Life of this patent
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Abstract
A material may be included in a cooling film or cooling panel to achieve cooling even under direct solar irradiation. The material includes one or more constituent materials and an outer surface configured to interact thermally with the atmosphere and with solar radiation. The material exhibits an emissivity of at least 0.8 in spectral range of 5 μm to 15 μm, an ultraviolet reflectivity of at least 0.5 in the spectral range of 275 nm to 375 nm, an ultraviolet absorptivity of at least 0.75 in the spectral range of 275 nm to 375 nm, or a combination thereof. A cooling film, or cooling panel, may be affixed to an exterior surface of a vehicle, structure, or system to provide cooling even under direct solar irradiance.
Claims20
A radiative cooling material that, under direct solar irradiation, comprises:
- an average thermal emissivity greater than 0.85 in a spectral range of 5 μm to 15 μm;
- and
- an average reflectance of at least 0.8 in a spectral range of 0.3 μm to 4 μm.
A cooling panel comprising:
- an outer surface configured to interact thermally with an atmosphere and with solar radiation;
- and
- a radiative cooling material that causes the cooling panel to comprise:
- an average thermal emissivity greater than 0.85 in a spectral range of 5 μm to 15 μm, and
- an average reflectance of at least 0.8 in a spectral range of 0.3 μm to 4 μm.
A cooling system comprising:
- a radiative cooling material affixed to a heat exchanger, wherein under direct solar irradiation, the radiative cooling material comprises:
- an average thermal emissivity greater than 0.85 in a spectral range of 5 μm to 15 μm, and
- an average reflectance of at least 0.8 in a spectral range of 0.3 μm to 4 μm;
- and
- the heat exchanger, wherein the heat exchanger is configured to cool a fluid based on a cooling power of the radiative cooling material.
Dependencies are inferred from the claim text.