Radiative cooling systems
SkyCool Systems, Inc.
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.
1ClaimsFirst of 20
- 1
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.
2Description
One challenge radiative cooling materials face is their long-term exposure because they are arranged outdoors to enable the radiative cooling effect. For example, durability under both sunlight and weathering conditions poses a central challenge to the effectiveness of a cooling panel.