期刊
ACS PHOTONICS
卷 5, 期 11, 页码 4554-4560出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.8b01026
关键词
solar absorber; radiative cooling selective emission; thermochromic materials
类别
资金
- Los Alamos National Laboratory (LANL) Laboratory Directed Research and Development (LDRD) program
- Center for Nonlinear Studies (CNLS)
A thermostat senses the temperature of a physical system and switches heating or cooling devices on or off, regulating the flow of heat to maintain the system's temperature near a desired set point. Taking advantage of recent advances in radiative heat transfer technologies, here we propose a passive radiative thermostat based on phase change photonic nanostructures for thermal regulation at room temperature. By self-adjusting their visible to mid-IR absorptivity and emissivity responses depending on the ambient temperature, the proposed devices use the sky to passively cool or heat during day-time using the phase-change temperature is maintained at or below ambient. We simulate the performance of a passive nanophotonic thermostat design based on vanadium dioxide thin films, showing daytime passive cooling (heating) with respect to ambient in hot (cold) days, maintaining an equilibrium temperature approximately locked within the phase transition region. Passive radiative thermostats can potentially enable novel thermal management technologies, for example, to moderate diurnal temperature in regions with extreme annual thermal swings.
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