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Abstract
Radiative cooling passively removes heat from objects via emission of thermal radiation to cold space. Suitable radiative cooling materials absorb infrared light while they avoid solar heating by either reflecting or transmitting solar radiation, depending on the application. Here, we demonstrate a reflective radiative cooler and a transparent radiative cooler solely based on cellulose derivatives manufactured via electrospinning and casting, respectively. By modifying the microstructure of cellulose materials, we control the solar light interaction from highly reflective (> 90%, porous structure) to highly transparent (≈ 90%, homogenous structure). Both cellulose materials show high thermal emissivity and minimal solar absorption, making them suitable for daytime radiative cooling. Used as coatings on silicon samples exposed to sun light at daytime, the reflective and transparent cellulose coolers could passively reduce sample temperatures by up to 15 °C and 5 °C, respectively.
Highlights
Passive radiative cooling has the potential to reduce the world’s energy-consumption by complementing and replacing traditional active methods to control indoor temperature, such as using air-conditioning
We first note that the thinnest reflective cooler shows lower absorptance and higher transmittance in the MIR compared with the transparent cooler despite very similar thicknesses, which can be explained by lower density and less material in the beam path for the porous material
Our study shows that cellulose is suitable for passive radiative cooling and that different types of coolers can be made by varying the preparation method
Summary
Passive radiative cooling has the potential to reduce the world’s energy-consumption by complementing and replacing traditional active methods to control indoor temperature, such as using air-conditioning. Both cellulose materials show high thermal emissivity and minimal solar absorption, making them suitable for daytime radiative cooling. Used as coatings on silicon samples exposed to sun light at daytime, the reflective and transparent cellulose coolers could passively reduce sample temperatures by up to 15 °C and 5 °C, respectively.
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