Round-the-Clock Sub-Ambient Cooling via Dynamic Sky View Factor Steering
Abstract
Passive daytime radiative cooling holds significant potential to address sustainability challenges such as the energy-water nexus. However, common static horizontal configurations cannot respond to dynamic changes of environmental conditions such as solar position and cloud coverage, thereby forfeiting the opportunity of optimizing the cooling performance in the 24-h day-night cycle. Here, inspired from the heliotropism of sunflowers, we develop a dynamic sky view factor steering (DSVFS) system. By dynamically steering the emitter to an optimal angle, this system not only relaxes the stringent dual requirement of ultra-high solar reflectivity and infrared emissivity of the radiative emitter, but also maximizes its cooling power round-the clock. Using this DSVFS system, we experimentally demonstrate sub-ambient cooling during a typical hot noon even with a near-blackbody emitter; with a selective emitter, we demonstrate an increase of cooling power by 135% as compared to its static counterpart. Case studies of multiple cities across the world indicate a maximum annual electricity saving of up to 200 kWh/m^2.
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BibTeX
@misc{chen2026roundtheclock,
title = {{Round-the-Clock Sub-Ambient Cooling via Dynamic Sky View Factor Steering}},
author = {Qiuyu Chen and Minghao Dong and Zheng Zhang and Xiaodonog Zhao and Peng Xiao and Zhen Chen},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.09660},
eprint = {2609.09660},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.09660},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Round-the-Clock Sub-Ambient Cooling via Dynamic Sky View Factor Steering
AU - Qiuyu Chen
AU - Minghao Dong
AU - Zheng Zhang
AU - Xiaodonog Zhao
AU - Peng Xiao
AU - Zhen Chen
PY - 2026
DA - 2026/09/09
PB - arXiv
DO - 10.48550/arxiv.2609.09660
UR - https://arxiv.org/abs/2609.09660
AB - Passive daytime radiative cooling holds significant potential to address sustainability challenges such as the energy-water nexus. However, common static horizontal configurations cannot respond to dynamic changes of environmental conditions such as solar position and cloud coverage, thereby forfeiting the opportunity of optimizing the cooling performance in the 24-h day-night cycle. Here, inspired from the heliotropism of sunflowers, we develop a dynamic sky view factor steering (DSVFS) system. By dynamically steering the emitter to an optimal angle, this system not only relaxes the stringent dual requirement of ultra-high solar reflectivity and infrared emissivity of the radiative emitter, but also maximizes its cooling power round-the clock. Using this DSVFS system, we experimentally demonstrate sub-ambient cooling during a typical hot noon even with a near-blackbody emitter; with a selective emitter, we demonstrate an increase of cooling power by 135% as compared to its static counterpart. Case studies of multiple cities across the world indicate a maximum annual electricity saving of up to 200 kWh/m^2.
ER -