Hybrid concentrated radiative cooling and solar heating in a single system
Hybrid concentrated radiative cooling and solar heating in a single system
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DOI：
10.1016/j.xcrp.2021.100338
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发表时间：
2021-02-24
影响因子：
8.9
通讯作者：
Gan, Qiaoqiang
中科院分区：
文献类型：
--
作者：
Zhou, Lyu;Song, Haomin;Gan, Qiaoqiang
辐射冷却是一种新兴的可持续技术，不需要电力来运作。然而，为了实现亚环境冷却，必须尽量减少入射太阳能的影响。考虑到一个理想的黑体辐射体在300 K时，最大冷却功率密度类似于160 W/m(2)。在这里，我们报告了一种能够克服这一挑战的架构，通过使用两个光谱选择性反射镜同时吸收入射阳光，并重新引导垂直排列的发射器的热发射。垂直发射器的两侧可以一起使用，在受控的实验室环境中实现超过270 W/m(2)的测量局部冷却功率密度。在标准大气压下，我们在实验室环境中实现了比环境温度低14摄氏度的冷却，在室外测试中实现了比环境温度低12摄氏度以上的冷却。
Radiative cooling is an emerging sustainable technology that does not require electricity to function. However, to realize sub-ambient cooling, the effects of the undesired incident solar energy must be minimized. Considering an ideal blackbody radiator at 300 K, the maximum cooling power density is similar to 160 W/m(2) Here, we report an architecture capable of overcoming this challenge by using two spectrally selective mirrors to simultaneously absorb the incident sunlight and re-direct the thermal emission from a vertically aligned emitter With this configuration, both sides of the vertical emitter can be used together to realize a measured local cooling power density of over 270 W/m(2) in a controlled laboratory environment. Under standard atmospheric pressure, we realized cooling that was 14 degrees C below the ambient temperature in the laboratory environment and a more than 12 degrees C temperature reduction in outdoor testing.