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; Javey, Ali; Urban, Jeffrey J.; Yao, Jie; Levinson, Ronnen; Wu, Junqiao

doi:10.1126/science.abf7136

Cited by 402 publications

(295 citation statements)

References 78 publications

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“…Therefore, a low solar absorption SRD is desirable for the integral thermal control system of microsatellites. The surface micro-and nano-optical structure can realize the low solar absorption surface [14,15]. However, the micro-and nano-processing suffers from harsh experimental techniques and difficulty of preparing large area surface.…”

Section: Introductionmentioning

confidence: 99%

Design of highly reflective film for smart radiation device

Wang¹,

Yang²,

Li³

et al. 2022

Vib. proced.

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Smart radiation device (SRD) based on the asymmetrical Fabry-Perot cavity automatically tune its IR emittance depending on the ambient temperature, making it an ideal choice for thermal control system of spacecrafts. The low solar absorption is desirable for SRD to prevent the spacecraft from overheating by sun light. In this paper, a multilayer highly reflective film with 𝐿𝐻 stacking layers is designed to reduce the solar absorptance (𝐴 ) of the Ag/Al 2 O 3 /VO 2 structured SRD. The reflective film achieves a high reflection band in ~220 nm bandwidth from 460 nm to 680 nm, which results in a reduction of the solar absorptance by 25.56 % for SRD working at low temperature and 24.27 % at high temperature as the stacking factor 𝑘 5. The simulation results indicate that an economic reflective film with 𝑘 3 can achieve effective suppression of 𝐴 of SRD, demonstrating the promising potential of the proposed reflective film in thermal control application of spacecrafts.

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Section: Introductionmentioning

confidence: 99%

Design of highly reflective film for smart radiation device

Wang¹,

Yang²,

Li³

et al. 2022

Vib. proced.

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“…Recent empirical research reveals the conception of some very promising tunable radiative coolers. A temperature-adaptive radiative coating using vanadium dioxide doped with tungsten increased the thermal emittance from 0.20 for ambient temperatures lower than 15 • C to 0.90 for temperatures above 30 • C [44]. Moreover, a radiative coating applied over an aluminum plate achieved 6 • C below the ambient temperature under a solar intensity of 744 Wm −2 , yielding a cooling power of 84.2 Wm −2 [45].…”

Section: Optical Modulation Of Passive Daytime Radiative Coolingmentioning

confidence: 99%

Optically Modulated Passive Broadband Daytime Radiative Cooling Materials Can Cool Cities in Summer and Heat Cities in Winter

et al. 2022

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Broadband passive daytime radiative cooling (PDRC) materials exhibit sub-ambient surface temperatures and contribute highly to mitigating extreme urban heat during the warm period. However, their application may cause undesired overcooling problems in winter. This study aims to assess, on a city scale, different solutions to overcome the winter overcooling penalty derived from using PDRC materials. Furthermore, a mesoscale urban modeling system assesses the potential of the optical modulation of reflectance (ρ) and emissivity (ε) to reduce, minimize, or reverse the overcooling penalty. The alteration of heat flux components, air temperature modification, ground and roof surface temperature, and the urban canopy temperature are assessed. The maximum decrease of the winter ambient temperature using standard PDRC materials is 1.1 °C and 0.8 °C for daytime and nighttime, respectively, while the ρ+ε-modulation can increase the ambient temperature up to 0.4 °C and 1.4 °C, respectively, compared to the use of conventional materials. Compared with the control case, the maximum decrease of net radiation inflow occurred at the peak hour, reducing by 192.7 Wm−2 for the PDRC materials, 5.4 Wm−2 for ρ-modulated PDRC materials, and 173.7 Wm−2 for ε-PDRC materials; nevertheless, the ρ+ε-modulated PDRC materials increased the maximum net radiation inflow by 51.5 Wm−2, leading to heating of the cities during the winter.

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“…[1] In conventional active thermal management, ultra-conductivity could be reached effectively via thermal enhancements with phase changes or heat sources. [2][3] On the other hand, the emerging metamaterials [4][5][6][7][8][9][10][11][12] based on digital conductivity distributions also reveal significant advances in guiding heat fluxes in elaborate formations. [13][14][15][16][17][18][19][20][21][22][23][24] The recent discoveries of advective metamaterials further enrich such a regime with conductive and inhomogeneous tunability.…”

Section: Introductionmentioning

confidence: 99%

Passive Ultra‐Conductive Thermal Metamaterials

Guo

Tian

et al. 2022

Advanced Materials

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Ultra‐conductive heat transport showcases significant potentials in popular thermal managements with convection, phase change, and heat source. However, it is captivated impossible for passive thermal manipulation, usually bounded by intrinsic thermal conductivities of natural materials, to outperform these active recipes in need of extra energy payload. Here, a robust recipe to create passive ultra‐conductive thermal metamaterials consisting of nothing but bulk natural materials is reported. Thanks to the local thermal resistance regulation by vertical thermal transport channel, the proof‐of‐concept thermal metamaterials experimentally demonstrate extreme effective conductivity (1915 W m–1 K–1) solely with naturally occurring materials. The purely conductive modulation without any external energy is comparable to active counterparts, and further reveals its robustness and unexpected convenience. The findings construct a high‐efficient paradigm of passive thermal management with ultra‐conductive heat transport, and further hint potentials in other Laplace fields, e.g., DC and magnetostatics.

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

Cited by 402 publications

References 78 publications

Design of highly reflective film for smart radiation device

Design of highly reflective film for smart radiation device

Optically Modulated Passive Broadband Daytime Radiative Cooling Materials Can Cool Cities in Summer and Heat Cities in Winter

Passive Ultra‐Conductive Thermal Metamaterials

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