A self-adaptive film for passive radiative cooling and solar heating regulation

Abstract

Although passive radiative cooling has received great attention recently because it can minimize the absorption of thermal energy and emits its own thermal energy to the cold outer space, the...

Recent progress in organic-based radiative cooling materials: fabrication methods and thermal management properties

“…11c), radiative cooling efficiency of 1.8–3.7 °C during a hot day, and above-ambient solar heating of 4.3–5.8 °C in cold weather. 150 Overheating problems often occur in electronic devices, which will reduce the working efficiency or even burn the circuit itself. Similarly, with the advent of electric vehicles, the temperature of batteries should be controlled, and the air conditioning needs inside the vehicle can severely limit their driving range.…”

Integration of daytime radiative cooling and solar heating

“…Currently, thermal responsiveness is mainly based on two classes of materials: VO 2 16 , 17 and poly(N-isopropyl acrylamide) (pNIPAm) hydrogels. 18 , 19 , 20 The regulation of VO 2 is primarily achieved via a metal-insulator phase transition. VO 2 exhibits distinct features toward mid-IR light in these two states.…”

“…Mei et al. 19 designed a PVDF@PNIPAm film that can achieve high visible-light reflectance/transmittance modulation (ΔR vis = 70.0% and ΔT vis = 86.3%) and high mid-IR emissivity (0.96). The outdoor test results show that the material can have a temperature drop of 1.8°C–3.7°C during a hot day and an increase of 4.3°C–5.8 °C during a cold day.…”

“…Although this field has been widely explored in the past few years, it is still in its early stages. To further promote research in this field and effectively solve its problems, we summarize the previous results from two aspects, switch mode (including electrical, 13 , 14 , 15 thermal-responsive, 16 , 17 , 18 , 19 , 20 and mechanical regulations 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 ) and collaborative mode, 29 , 30 and introduce their principles, characteristics, and progress. In addition, unresolved scientific and technical issues associated with the outlook are presented in this paper.…”

A bioinspired and scalable near-ideal broadband coating for radiative thermoregulation

“…[1][2][3] As a promising cooling approach, passive daytime radiative cooling (PDRC) has gained increasing interest owing to the capability to achieve a sub-ambient cooling effect without additional energy input and pollutant emission. [4][5][6][7][8][9] The key to realizing PDRC is to ensure that the PDRC coating strongly reects in the solar spectrum (0.3-2.5 mm) and simultaneously radiates thermal energy to outer deep space via the atmospheric sky window (8-13 mm). More specically, from the perspective of the emissivity prole in the infrared spectrum (2.5-25 mm), the prevalent PDRC coatings can be primarily sorted as either broadband or selective.…”