气凝胶
辐射冷却
材料科学
能源消耗
蒸发冷却器
热的
辐射传输
被动冷却
环境科学
光电子学
工程物理
工艺工程
纳米技术
机械工程
气象学
光学
电气工程
物理
工程类
作者
Chenyang Cai,Zechang Wei,Chunxiang Ding,Bianjing Sun,Wenbo Chen,Christoph Gerhard,Evgeny Nimerovsky,Yu Fu,Kai Zhang
出处
期刊:Nano Letters
[American Chemical Society]
日期:2022-05-05
卷期号:22 (10): 4106-4114
被引量:63
标识
DOI:10.1021/acs.nanolett.2c00844
摘要
A passive cooling strategy without any electricity input has shown a significant impact on overall energy consumption globally. However, designing tunable daytime radiative cooler to meet requirement of different weather conditions is still a big challenge, especially in hot, humid regions. Here, a novel type of tunable, thermally insulating and compressible cellulose nanocrystal (CNC) aerogel coolers is prepared via chemical cross-linking and unidirectional freeze casting process. Such aerogel coolers can achieve a subambient temperature drop of 9.2 °C under direct sunlight and promisingly reached the reduction of ∼7.4 °C even in hot, moist, and fickle extreme surroundings. The tunable cooling performance can be realized via controlling the compression ratio of shape-malleable aerogel coolers. Furthermore, energy consumption modeling of using such aerogel coolers in buildings in China shows 35.4% reduction of cooling energy. This work can pave the way toward designing high-performance, thermal-regulating materials for energy consumption savings.
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