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Color-preserving daytime radiative cooling
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10.1063/1.4835995
/content/aip/journal/apl/103/22/10.1063/1.4835995
http://aip.metastore.ingenta.com/content/aip/journal/apl/103/22/10.1063/1.4835995
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a) The black curve is the emissivity/absorptivity spectrum the original structure which, for simplicity, absorbs sunlight at a flat value and emits no thermal radiation. The normalized solar radiation spectrum of spectrum is shown in yellow. The normalized atmosphere transmission spectrum is shown in magenta. (b) The black curve is the ideal emissivity/absorptivity spectrum of a modified structure, which has unity emissivity at thermal wavelengths. (c) The difference between the equilibrium temperatures for the original and the modified structures ( ), at , as a function of non-radiative heat exchange coefficient , for different amounts of solar absorption . (d) as a function of , for , at .

Image of FIG. 2.
FIG. 2.

(a) Schematic of the original structure, with silicon nanowire array on top of an aluminum substrate. A disproportionate schematic is also shown to clarify the geometry. The color for reflection at normal incidence under sunlight is shown. (b) The black curve is the emissivity/absorptivity spectrum of the original structure. The normalized solar radiation spectrum of the spectrum is shown in yellow. The normalized atmosphere transmission spectrum is shown in magenta. (c) Schematic of the modified structure, with quartz bar array on top of the original structure of silicon nanowires. (d) The black curve is the emissivity/absorptivity spectrum of the modified structure.

Image of FIG. 3.
FIG. 3.

(a) Equilibrium temperature () subtracted by ambient temperature , for the modified structure with quartz bar array (blue curve) and the original structure (green curve), as a function of non-radiative heat exchange coefficient . (b) The difference ( ) between the equilibrium temperatures for the original and the modified structures, as a function of . The modified structure has a meaningfully lower equilibrium temperature even for large values of .

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/content/aip/journal/apl/103/22/10.1063/1.4835995
2013-11-26
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Color-preserving daytime radiative cooling
http://aip.metastore.ingenta.com/content/aip/journal/apl/103/22/10.1063/1.4835995
10.1063/1.4835995
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