Nanoparticle-polymer hybrid dual-layer coating with broadband solar reflection for high-performance daytime passive radiative cooling

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

12 Scopus Citations
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Detail(s)

Original languageEnglish
Article number112507
Journal / PublicationEnergy and Buildings
Volume276
Online published23 Sept 2022
Publication statusPublished - 1 Dec 2022

Abstract

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.

Research Area(s)

  • Daytime Passive Radiative Cooling, Large-Scale Application, Nanoparticle-embedded Polymer Matrix, Solar Reflection, Thermal Radiation

Citation Format(s)

Nanoparticle-polymer hybrid dual-layer coating with broadband solar reflection for high-performance daytime passive radiative cooling. / Lin, Kaixin; Du, Yuwei; Chen, Siru et al.
In: Energy and Buildings, Vol. 276, 112507, 01.12.2022.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review