LI Kun ¹, DONG Gang ^{1, 2}, ZHOU Tianxiang ¹, SHI Wei ^{1, 2}, SU Xiaoli ^{1, 2}, ZENG Tao ^{1, 2}, LUO Ting ¹,TANG Qi ³, CHEN Yunxia ^{1, 2}
(1. Jingdezhen Ceramic University , Jingdezhen 333403, Jiangxi, China; 2. Jiangxi Key Laboratory of Advanced Ceramic Materials, Jingdezhen 333000, Jiangxi, China; 3.Guangdong Tidiy Ceramics Co., Ltd, Foshan 528000, Guangdong, China)

Abstract: As global temperature rises rapidly, the impact of refrigeration consumption on the growth of global electricity demand is becoming increasingly significant. Radiative sky cooling is an emerging passive cooling technology, which, through spectral manipulation, radiates energy as heat into outer space through the "atmospheric window", thereby lowering building temperatures without energy input. In recent years, with the development of radiative cooling materials (such as photonic crystals), radiative cooling has demonstrated potential applications not only at night but also under sunlight. This paper was aimed to review the principles and structural designs of radiative sky cooling technology from the perspective of material development and analyzes the challenges faced by integrated building-radiative cooling systems. Finally, by summarizing the applications of radiative cooling materials in cool roofs and building cooling systems, it is aimed to provide new insights into the preparation of sky radiative cooling materials.
Key words: radiative cooling; energy-saving buildings; carbon neutralization in buildings; photonic crystals; refrigeration and energy-saving