Performance evaluation of various strategies to improve sub-ambient radiative sky cooling
| Autor: | Jian Zuo, Debao Zhang, Junwei Liu, Ke Huang, Ji Zhang, Huajie Tang, Jianjuan Yuan, Zhihua Zhou, Jincheng Xing |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Daytime
Work (thermodynamics) 060102 archaeology Radiative cooling Renewable Energy Sustainability and the Environment business.industry 020209 energy media_common.quotation_subject Solar intensity 06 humanities and the arts 02 engineering and technology Polyethylene chemistry.chemical_compound chemistry Sky 0202 electrical engineering electronic engineering information engineering Radiative transfer Environmental science 0601 history and archaeology Aerospace engineering Temperature drop business media_common |
| Zdroj: | Renewable Energy. 169:1305-1316 |
| ISSN: | 0960-1481 |
| DOI: | 10.1016/j.renene.2021.01.103 |
| Popis: | Since the breakthrough of daytime radiative sky cooling, more and more effort has been devoted to this promising technology. But the low cooling performance places great restrictions on the application of this technology. In this work, various strategies are used to further improve the radiative cooling performance. The theoretical analysis reveals that the parameters corresponding to different strategies have great impact on the cooling performance. The experiments with individual strategy indicate that nano polyethylene wind cover strategy can achieve daytime temperature drop of about 5.6 K, improving by about 143.4% compared to that without wind cover (2.3 K). And ordinary polyethylene wind cover strategy and tilt strategy can also achieve daytime temperature drop of about 3.2 K and 4.3 K, improving by about 78.3% and 39.1%, respectively. But inverted pyramid strategy reduces daytime cooling performance by about 33%, due to the higher solar intensity on the radiative cooler. Subsequently, experiments with combined strategy show that the combination of nano polyethylene wind cover strategy and tilt strategy can enable radiative cooler achieve the higher all-day cooling performance, comparable to the results in arid areas. Further discussion on other strategies indicates that polyethylene aerogel has great potential in further improving the cooling performance. |
| Databáze: | OpenAIRE |
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