TY - JOUR
T1 - Temperature-adaptive radiative coating for all-season household thermal regulation
AU - Tang, Kechao
AU - Dong, Kaichen
AU - Li, Jiachen
AU - Gordon, Madeleine P.
AU - Reichertz, Finnegan G.
AU - Kim, Hyungjin
AU - Rho, Yoonsoo
AU - Wang, Qingjun
AU - Lin, Chang Yu
AU - Grigoropoulos, Costas P.
AU - Javey, Ali
AU - Urban, Jeffrey J.
AU - Yao, Jie
AU - Levinson, Ronnen
AU - Wu, Junqiao
N1 - Publisher Copyright:
© 2021 American Association for the Advancement of Science. All rights reserved.
PY - 2021/12/17
Y1 - 2021/12/17
N2 - 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. 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.
AB - 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. 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.
UR - http://www.scopus.com/inward/record.url?scp=85122390605&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85122390605&partnerID=8YFLogxK
U2 - 10.1126/science.abf7136
DO - 10.1126/science.abf7136
M3 - Article
C2 - 34914515
AN - SCOPUS:85122390605
VL - 374
SP - 1504
EP - 1509
JO - Science
JF - Science
SN - 0036-8075
IS - 6574
ER -
