Radiative Cooling With Pigmented Polyethylene Foils

Gunnar A. Niklasson; Tord S. Eriksson

doi:10.1117/12.949918

6 March 1989 Radiative Cooling With Pigmented Polyethylene Foils

Gunnar A. Niklasson, Tord S. Eriksson

Proceedings Volume 1016, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion VII; (1989) https://doi.org/10.1117/12.949918
Event: 1988 International Congress on Optical Science and Engineering, 1988, Hamburg, Germany

Abstract

Polyethylene foils containing a nonabsorbing pigment can be suitable for radiative cooling because of their high reflectance of solar radiation combined with a high transmittance in the atmospheric window region in the thermal infrared. We have studied the optical properties in the wavelength range 0.3-50 μm of extruded polyethylene foils containing various amounts of 0.23 μm diameter Ti0₂ particles. It appears that the foils can prevent heating of an underlying material, even when directly illuminated by the sun. The total transmittance and reflectance of the Ti0₂-polyethylene foils were compared with multiple scattering calculations. Lorenz-Mie theory was used to model the scattering and absorption of a single TiO₂ sphere. The single scattering parameters were then introduced into the four flux theory, by which the transmittance and reflectance were calculated. We find a satisfactory agreement between theory and experiments in most cases.

Citation Download Citation

Gunnar A. Niklasson and Tord S. Eriksson "Radiative Cooling With Pigmented Polyethylene Foils", Proc. SPIE 1016, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion VII, (6 March 1989); https://doi.org/10.1117/12.949918

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