Novel Passive Radiation Cooling Materials with High Emissivity Discovered by FDTD Method

The cooling with the traditional condensation method leads to huge energy consumption, while increasing attention has been paid radiant because of its characteristics no additional consumption and pollution. In order obtain materials higher infrared emissivity better performance for daytime passive radiation materials, different was studied based on finite-difference time-domain method. A new composite material high found. results show that highest can reach 99.1% by adding Si3N4, Al2O3 Fe2O3 particles volume fractions 6% diameters 50 nm into polydimethylsiloxane. This is most excellent ever By combining emitting layer made polydimethylsiloxane mixed nanoparticles reflecting Ag foil, film a solar transmissivity 96.4% “sky window” mean 94.2%. reflectivity realized. be used as good help solve problem caused consumption.