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- Title
Passive daytime radiative cooling aerogels based on wollastonite particle-embedded cellulose for energy-saving buildings.
- Authors
Deng, Chen; Zhao, Bencheng; Wang, Zhuoqun; Yue, Xuejie; Yang, Dongya; Qiu, Fengxian
- Abstract
Passive daytime radiative cooling (PRDC) is a promising technology providing a cooling strategy that radiates heat directly into outer space without additional energy consumption, a crucial consideration in controlling construction energy consumption. However, the preparation of PRDC materials with controlled radiative properties is still challenging because the radiative interface must be maintained in a clean environment. Herein, a densely distributed porous hybrid aerogel with controlled radiative properties was fabricated using the wollastonite and cellulose as building blocks for building energy-saving applications. To do this, the cellulose pulp was obtained by using waste paper as raw material. Then, the hybrid aerogels, comprising paper cellulose and wollastonite particles, were fabricated by combining the acrylic acid polymers (PAA) bonding, freeze drying and vapor deposition modification. The radiative cooling hybrid aerogel exhibits high solar reflectivity (94.6%) and high atmospheric emissivity (95.1%), due to the laminated design of wollastonite randomly dispersed in the radiative hybrid aerogel. The excellent PRDC capability is also proven by outdoor tests where practical temperature difference is ~ 6.3 ℃ and the maximum cooling power of 147.4 Wm−2 under direct sun irradiance. Wettability test infers that the hybrid aerogel has a static water contact angle of 144.07° ± 2°, thereby indicating its hydrophobicity. In addition, based on the Energyplus simulation, the hybrid aerogel exhibits an average annual cooling energy saving of 8% in buildings across China. The excellent radiative cooling and self-cleaning properties of hybrid aerogel make it durable for long-term outdoor PRDC applications.
- Subjects
CHINA; ENERGY conservation in buildings; WOLLASTONITE; CELLULOSE; AEROGELS; WASTE paper; VAPOR-plating
- Publication
Cellulose, 2024, Vol 31, Issue 9, p5707
- ISSN
0969-0239
- Publication type
Article
- DOI
10.1007/s10570-024-05844-6