| 초록 |
A bunch of issues on a reduction of electricity consumption has been discussed for recent years. A development of passive device without electricity is necessary to resolve the problem. To response the demands, diverse green energies not to consume the electricity has been developed such as radiative cooling. In this research, we demonstrate a passive device that works as a wavelength-selective thermal emitter for radiative cooling. The suggested thermal emitter consists of polydimethylsiloxane (PDMS) as selective thermal emitter and aluminium (Al) as a solar reflector. Al layer of the emitter has a thickness with 110 nm to be perfect broadband reflector. PDMS is transparent in visible region (0.4-0.8 μm), while emissive in middle infrared (mid-IR) region (8.0-13.0 μm). With aforementioned optical properties of PDMS, we determined the optimized coating thickness of PDMS with 17.5 μm. The optimized wavelength-selective thermal emitter performed emissivity of 87 % in the mid-IR region. |
