Temperature-adaptive radiative coating for all-season household thermal regulation

Tang, Kechao; Dong, Kaichen; Li, Jiachen; Gordon, Madeleine P.; Reichertz, Finnegan G.; Kim, Hyungjin; Rho, Yoonsoo; Wang, Qingjun; Lin, Chang-Yu; Grigoropoulos, Costas P.; Javey, Ali; Urban, Jeffrey J.; Yao, Jie; Levinson, Ronnen; Wu, Junqiao

doi:10.1126/science.abf7136

Title: Temperature-adaptive radiative coating for all-season household thermal regulation

Journal Article · 16 December 2021 · Science

DOI: https://doi.org/10.1126/science.abf7136 · OSTI ID:1875448

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Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Peking Univ., Beijing (China)
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
East Bay Innovation Academy, Oakland, CA (United States)
Univ. of California, Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

The sky is a natural heat sink that has been extensively used for passive radiative cooling of households. A lot of focus has been on maximizing the radiative cooling power of roof coating in the hot daytime using static, cooling-optimized material properties. However, the resultant overcooling in cold night or winter times exacerbates the heating cost, especially in climates where heating dominates energy consumption. In this work, we approached thermal regulation from an all-season perspective by developing a mechanically flexible coating that adapts its thermal emittance to different ambient temperatures. The fabricated temperature-adaptive radiative coating (TARC) optimally absorbs the solar energy and automatically switches thermal emittance from 0.20 for ambient temperatures lower than 15°C to 0.90 for temperatures above 30°C, driven by a photonically amplified metal-insulator transition. Simulations show that this system outperforms existing roof coatings for energy saving in most climates, especially those with substantial seasonal variations.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Molecular Foundry

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Building Technologies Office; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1875448

Journal Information:: Science, Journal Name: Science Journal Issue: 6574 Vol. 374; ISSN 0036-8075

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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