Fig. 1: The working principle of the enhanced color-preserving radiative cooling (ECRC) strategy for thermal management of actively temperature-regulated enclosures.
From: Color-preserving passive radiative cooling for an actively temperature-regulated enclosure
a Schematic diagram of the heat exchange between an actively temperature-regulated enclosure and external space via the roof. b Energy flow diagram of the overall system at thermal steady-state. c Design of the ECRC. The structure consists of two parts: a visible-transparent optimized hot mirror on the exterior surface of the roof and a visible-transparent radiant barrier on the interior surface. d Ideal spectra for the exterior surface (red) and the interior surface (blue) of the ECRC. The red dashed and solid lines denote the selective emitter (SE) and the broadband emitter (BE), respectively, for the exterior surface. The visible band ranges from 0.4 to 0.8 μm. The orange area denotes AM 1.5 solar spectrum. The pink area denotes the radiation spectrum of a blackbody at 35 °C. The light blue area denotes the atmosphere window. e Calculated exterior surface temperature (Text) of roofs illuminated by different solar irradiance (qsun). The interior surface emissivity is set as 0.9. f Calculated outward (dotted line) and inward (solid line) heat flow of roofs with different interior surface emissivity (εint). The solar irradiance is set to be 1000 W m−2. For both calculations, the atmospheric temperature (Tatm) and room temperature (Troom) are set as 35 °C and 26 °C, respectively
