A dual-layer polymer-based film for all-day sub-ambient radiative sky cooling

Jie Liu, Chengfeng Xu, Xianze Ao, Kegui Lu, Bin Zhao and Gang Pei

Energy, 2022, vol. 254, issue PA

Abstract: Radiative sky cooling (RSC) is a promising eco-friendly technique that requires no energy input for sub-ambient cooling. A radiative cooler with high solar reflection and strong thermal emission is the key to achieving sub-ambient cooling effect. Recently, polymer-based coolers have attracted much attention due to their excellent radiative properties and flexibility. Herein, the parasitic absorption of functional groups is applied to select polymer materials for radiative cooling, and a dual-layer film consisting of ethylene-tetra-fluoro-ethylene (ETFE) film and silver layer is fabricated for all-day sub-ambient RSC. Optical characterization shows that the fabricated ETFE cooler exhibits a high AM1.5 spectra-weighed solar reflectivity of 94% and has an average emissivity of nearly 0.83 in the atmospheric window (i.e.,8–13 μm). Besides, thermal performance tests reveal that the cooler's temperature is on average 3.0 °C lower than ambient air during daytime in Hefei, and is approximately 1.6 °C below ambient air even at noon. Additionally, the thermal performance prediction also indicates that the ETFE cooler is a good candidate for sub-ambient RSC.

Keywords: Radiative sky cooling; Passive cooling; Polymer film; ETFE; Spectral selectivity (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (13)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:254:y:2022:i:pa:s0360544222012531

DOI: 10.1016/j.energy.2022.124350

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