Passive radiative cooling reduces rooftop heat accumulation by reflecting solar radiation and emitting thermal energy through the atmospheric infrared window.
The Earth’s atmosphere is partially transparent in the mid-infrared spectrum, allowing thermal radiation to escape into outer space under suitable conditions.
Advanced radiative surfaces combine high solar reflectance with high infrared emissivity to reduce rooftop temperature under daytime exposure.
Potential solar reflectance performance
Atmospheric infrared transmission window
No compressors or electricity required