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A Janus emitter for passive heat release from enclosures.


ABSTRACT: Passive radiative cooling functions by reflecting the solar spectrum and emitting infrared waves in broadband or selectively. However, cooling enclosed spaces that trap heat by greenhouse effect remains a challenge. We present a Janus emitter (JET) consisting of an Ag-polydimethylsiloxane layer on micropatterned quartz substrate. The induced spoof surface plasmon polariton helps overcome inherent emissivity loss of the polymer and creates near-ideal selective and broadband emission on the separate sides. This design results in not only remarkable surface cooling when the JET is attached with either side facing outwards but also space cooling when used as an enclosure wall. Thus, the JET can passively mitigate the greenhouse effect in enclosures while offering surface cooling performance comparable to conventional radiative coolers.

SUBMITTER: Heo SY 

PROVIDER: S-EPMC7473666 | biostudies-literature | 2020 Sep

REPOSITORIES: biostudies-literature

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A <i>Janus</i> emitter for passive heat release from enclosures.

Heo Se-Yeon SY   Lee Gil Ju GJ   Kim Do Hyeon DH   Kim Yeong Jae YJ   Ishii Satoshi S   Kim Min Seok MS   Seok Tae Joon TJ   Lee Bong Jae BJ   Lee Heon H   Song Young Min YM  

Science advances 20200904 36


Passive radiative cooling functions by reflecting the solar spectrum and emitting infrared waves in broadband or selectively. However, cooling enclosed spaces that trap heat by greenhouse effect remains a challenge. We present a <i>Janus</i> emitter (<i>J</i>ET) consisting of an Ag-polydimethylsiloxane layer on micropatterned quartz substrate. The induced spoof surface plasmon polariton helps overcome inherent emissivity loss of the polymer and creates near-ideal selective and broadband emission  ...[more]

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