Details

Autor(en) / Beteiligte

• Yang, Zhangbin
• Sun, Haoxuan
• Xi, Yulin
• Qi, Yanli
• Mao, Zepeng
• Wang, Ping
• Zhang, Jun

Titel

Bio-inspired structure using random, three-dimensional pores in the polymeric matrix for daytime radiative cooling

Ist Teil von

• Solar energy materials and solar cells, 2021-08, Vol.227, p.111101, Article 111101

Ort / Verlag

Amsterdam: Elsevier B.V

Erscheinungsjahr

2021

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Inspired by the structural white of natural fibers, this work here demonstrated a novel passive radiative cooling design that builds random, three-dimensional pores in polymer matrix via the phase separation-based method. The pore size and structure are controlled by the compatibility between the shape-supporting matrix and other soluble polymers, where the semi-crystalline polypropylene (PP) was used as the shape-supporting matrix that is insoluble in any organic solvent at room temperature, and the soluble polymers were styrene-butadiene-styrene block copolymer (SBS) and styrene-ethylene-propylene-styrene block copolymer (SEPS). The experimental results revealed that those macroporous PP sheets have high solar reflectance (~97%) and tunable thermal emissivity (0.81-0.67). The outdoor thermal measurement also shows that those macroporous PP film-covered devices displayed a temperature (44.0 °C), much lower than those of air (50.0 °C) and neat-PP-covered device (60.4 °C). The complete simulation of a building thermal behavior evaluation shows that the macroporous PP roof-covered buildings exhibit a higher cooling effect than the neat PP roof-covered building in summer. Therefore, the required cooling power of the macroporous PP roof-covered buildings saved about 200 W compared with the neat PP roof-covered building on a typical summer day. [Display omitted] •The bio-inspired design of the random pore structure for radiative cooling.•Investigate the effect of the pores' size and shape on the optical properties.•Estimate the heat insulation effect of building covered by the structured material.