Global S&T Development Trend Analysis Platform of Resources and Environment
Radiative Cooler That Cools Down Even Under Sunlight | |
admin | |
2020-10-20 | |
发布年 | 2020 |
语种 | 英语 |
国家 | 美国 |
领域 | 气候变化 |
正文(英文) | Now that autumn is upon us, there is a large temperature gap between day and night. This is due to the temperature inversion caused by radiative cooling on the Earth's surface. Heat from the sun during the day causes its temperature to rise and when the sun sets during the night, its temperature cools down. Recently, a joint research team from POSTECH and Korea University has demonstrated a daytime radiative cooling effect which exhibits lower temperatures than its surroundings even during the day. Professor Junsuk Rho and Ph.D. candidate Dasol Lee of departments of mechanical engineering and chemical engineering and Professor Jin Kon Kim and Ph.D. candidate Myeongcheol Go in the Department of Chemical Engineering at POSTECH have conducted a joint study with Professor Heon Lee of Materials Science Engineering at Korea University to successfully realized an energy-free radiative cooling technology using silica-coated porous anodic aluminum oxide. The study was published in the latest online edition of Nano Energy, an international journal in the energy sector. With growing interest in energy consumption, such as environmental pollution and limitations in using fossil fuels, attempts to lower the temperature without consuming energy continue. Radiative cooling is an example of structures installed on windows or walls to reduce the building temperature by reflecting sunlight or by absorbing and radiating far-infrared light. Radiative cooling is a technology that allows objects to receive less energy from the sun and lower temperatures by emitting radiative heat. Unlike conventional cooling systems, radiative cooling is difficult to apply to large areas, although it has the advantage of significantly reducing energy consumption like electricity. Research to overcome this issue is being actively carried out around the world but it is still challenging to commercialize the technology. To this, the joint research team found a very simple solution. Just by coating the porous anodic aluminum with a thin film of silica, it has been confirmed that there is a cooling effect that exhibits a lower temperature than the surroundings even under direct sunlight. Experiments have confirmed that an optimized structure can have a reflectivity of 86% in the solar spectral region and a high emissivity of 96% in the atmospheric window (8-13 ?m). In addition, the radiative cooling material -- produced in centimeters -- showed a cooling efficiency of up to 6.1°C during the day when the sunlight was strong. "This newly developed radiative cooling material can be easily produced," explained POSTECH Professor Junsuk Rho. He added optimistically, "It will help solve environmental problems if applied to heating and cooling systems since it can be readily applied to large areas."
make a difference: sponsored opportunity
Story Source: Materials provided by Pohang University of Science & Technology (POSTECH). Note: Content may be edited for style and length. Journal Reference:
Cite This Page: Pohang University of Science & Technology (POSTECH). "Radiative cooler that cools down even under sunlight." ScienceDaily. ScienceDaily, 20 October 2020.
Pohang University of Science & Technology (POSTECH). (2020, October 20). Radiative cooler that cools down even under sunlight. ScienceDaily. Retrieved October 20, 2020 from www.sciencedaily.com/releases/2020/10/201020105545.htm
Pohang University of Science & Technology (POSTECH). "Radiative cooler that cools down even under sunlight." ScienceDaily. www.sciencedaily.com/releases/2020/10/201020105545.htm (accessed October 20, 2020).
|
URL | 查看原文 |
来源平台 | Science Daily |
文献类型 | 新闻 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/299714 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | admin. Radiative Cooler That Cools Down Even Under Sunlight. 2020. |
条目包含的文件 | 条目无相关文件。 |
个性服务 |
推荐该条目 |
保存到收藏夹 |
查看访问统计 |
导出为Endnote文件 |
谷歌学术 |
谷歌学术中相似的文章 |
[admin]的文章 |
百度学术 |
百度学术中相似的文章 |
[admin]的文章 |
必应学术 |
必应学术中相似的文章 |
[admin]的文章 |
相关权益政策 |
暂无数据 |
收藏/分享 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论