TY - JOUR
T1 - Nanoparticle-polymer hybrid dual-layer coating with broadband solar reflection for high-performance daytime passive radiative cooling
AU - Lin, Kaixin
AU - Du, Yuwei
AU - Chen, Siru
AU - Chao, Luke
AU - Him Lee, Hau
AU - Chung Ho, Tsz
AU - Zhu, Yihao
AU - Zeng, Yijun
AU - Pan, Aiqiang
AU - Yan Tso, Chi
PY - 2022/12/1
Y1 - 2022/12/1
N2 - The passive cooling technology is refrigerant-free and energy-free, making it an appealing alternative to reduce the energy consumption of traditional cooling systems. Although effective in optical design, the materials involving optical structures and metal reflectors are rarely cost-effective or readily applicable. Radiative cooling materials with promising optical properties and good practical applicability remain an urgent research need. We present a simple and scalable method to fabricate a dual-layer nanoparticle-polymer hybrid coating which achieves a high diffused solar reflection of 92.2 % without using metal reflectors, and a strong mid-infrared emission of 95.3 % within the atmospheric window. The coating allows continuous sub-ambient cooling in both daytime and nighttime. Promisingly, the coating reaches about 4 °C lower temperature than ambient under intensive solar irradiation, along with a 78.9 Wm−2 cooling power generation. Moreover, the cooling coating exhibits great reliability and cooling effect when applied as an exterior coating on model houses and the roof of a real building. Applying the proposed material as a roofing material is capable to save cooling energy across various climate zones, especially in the hot climate, which confirms the material's possibility for carbon reduction and tackling global climate change.
AB - The passive cooling technology is refrigerant-free and energy-free, making it an appealing alternative to reduce the energy consumption of traditional cooling systems. Although effective in optical design, the materials involving optical structures and metal reflectors are rarely cost-effective or readily applicable. Radiative cooling materials with promising optical properties and good practical applicability remain an urgent research need. We present a simple and scalable method to fabricate a dual-layer nanoparticle-polymer hybrid coating which achieves a high diffused solar reflection of 92.2 % without using metal reflectors, and a strong mid-infrared emission of 95.3 % within the atmospheric window. The coating allows continuous sub-ambient cooling in both daytime and nighttime. Promisingly, the coating reaches about 4 °C lower temperature than ambient under intensive solar irradiation, along with a 78.9 Wm−2 cooling power generation. Moreover, the cooling coating exhibits great reliability and cooling effect when applied as an exterior coating on model houses and the roof of a real building. Applying the proposed material as a roofing material is capable to save cooling energy across various climate zones, especially in the hot climate, which confirms the material's possibility for carbon reduction and tackling global climate change.
KW - Daytime Passive Radiative Cooling
KW - Large-Scale Application
KW - Nanoparticle-embedded Polymer Matrix
KW - Solar Reflection
KW - Thermal Radiation
UR - http://www.scopus.com/inward/record.url?scp=85138992816&partnerID=8YFLogxK
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85138992816&origin=recordpage
U2 - 10.1016/j.enbuild.2022.112507
DO - 10.1016/j.enbuild.2022.112507
M3 - RGC 21 - Publication in refereed journal
SN - 0378-7788
VL - 276
JO - Energy and Buildings
JF - Energy and Buildings
M1 - 112507
ER -