A Janus emitter for passive heat release from enclosures

Se-Yeon Heo; Gil Ju Lee; Do Hyeon Kim; Yeong Jae Kim; Satoshi Ishii; Min Seok Kim; Tae Joon Seok; Bong Jae Lee; Heon Lee; Young Min Song

doi:10.1126/sciadv.abb1906

A Janus emitter for passive heat release from enclosures

Sci Adv. 2020 Sep 4;6(36):eabb1906. doi: 10.1126/sciadv.abb1906. Print 2020 Sep.

Authors

Se-Yeon Heo¹, Gil Ju Lee¹, Do Hyeon Kim¹, Yeong Jae Kim¹, Satoshi Ishii^{2

3}, Min Seok Kim¹, Tae Joon Seok¹, Bong Jae Lee⁴, Heon Lee⁵, Young Min Song⁶

Affiliations

¹ School of Electrical Engineering and Computer Science (EECS), Gwangju Institute of Science and Technology, 123 Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Republic of Korea.
² International Center for Materials Nanoarchitectonics, National Institute of Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.
³ Japan Science and Technology Agency, PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan.
⁴ Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea.
⁵ Department of Materials Science and Engineering, Korea University, 145 Anam-ro, Sungbuk-gu, Seoul 02841, Republic of Korea.
⁶ School of Electrical Engineering and Computer Science (EECS), Gwangju Institute of Science and Technology, 123 Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Republic of Korea. ymsong@gist.ac.kr.

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.

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