A radiative cooler for passively mitigating greenhouse effect in enclosure.

Abstract

Nowadays, the A/C system has been essential element in the automobiles to stay comfortable, however, it causes significant power reduction and increases CO2 emission. Accordingly, Reducing the thermal load of the vehicle interior is crucial to improving both vehicle fuel economy and Earth environment. A passive radiative cooling strategy is fascinating solution since it does not emit pollutant nor use electrical power for releasing heat. Here, we present Janus passive radiative cooler for mitigating heat from enclosure (e.g., stationary vehicle). The Janus emitter (JET) consists of an Ag–polydimethylsiloxane layer on micro patterned quartz substrate. The induced spoof surface plasmon polariton from the substrate helps overcome inherent emissivity loss of the polymer and creates near-ideal selective and broadband emission on the separate sides. This design effectively draws heat from thermally sealed space because the bottom side can absorb thermal input in a broad spectral range while the top side emits heat to space without disturbing ambient radiation. As we strategically design of emissivity on both top and bottom side of the cooler, the JET pave the wave for space cooling of passive radiative strategy.