2021
DOI: 10.1016/j.enbuild.2021.111400
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A flexible and scalable solution for daytime passive radiative cooling using polymer sheets

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Cited by 27 publications
(12 citation statements)
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“…Beer’s law was applied with I 0 ′ (eq ) and since ε, τ, and ρ can be characterized, both I f and I 0 ′ can be defined. Thus, the following equations were derived from eqs and . I 0 ( 1 ρ ) e α t = τ I 0 α = prefix− ln ( τ 1 ρ ) t FT-IR with an integrating sphere coated with gold is commonly utilized to evaluate the ε in the IR wavelength regime (2.5–14 μm). ,,, ,,,, The α values of various polymers were plotted as a function of wavelength using eq , and PDMS and PVDF, which were widely studied as radiative-cooling materials, showed high α values across the wavelength regime for an atmospheric window (7–14 μm). Furthermore, PE has an extremely low α value, which indicates that it rarely absorbs IR radiation .…”
Section: Resultsmentioning
confidence: 99%
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“…Beer’s law was applied with I 0 ′ (eq ) and since ε, τ, and ρ can be characterized, both I f and I 0 ′ can be defined. Thus, the following equations were derived from eqs and . I 0 ( 1 ρ ) e α t = τ I 0 α = prefix− ln ( τ 1 ρ ) t FT-IR with an integrating sphere coated with gold is commonly utilized to evaluate the ε in the IR wavelength regime (2.5–14 μm). ,,, ,,,, The α values of various polymers were plotted as a function of wavelength using eq , and PDMS and PVDF, which were widely studied as radiative-cooling materials, showed high α values across the wavelength regime for an atmospheric window (7–14 μm). Furthermore, PE has an extremely low α value, which indicates that it rarely absorbs IR radiation .…”
Section: Resultsmentioning
confidence: 99%
“…In terms of designing materials for radiative cooling, multilayer structures composed of ceramic and thin metal layers are often employed to enhance the selective infrared radiation (IR) emissivity. , Additionally, it is proposed to utilize polymers with high IR emissivity. It is well known that poly­(dimethylsiloxane) (PDMS), , poly­(vinylidene fluoride) (PVDF), , poly­(tetrafluoroethylene) (PTFE), , poly­(methylmethacrylate) (PMMA), , and cellulose can absorb/emit over 90% of the IR regime ranging between 7 and 14 μm wavelength (atmospheric window). These polymer layers (∼5 mm thickness) are paired with metal plates ,,,, or porous structures ,,,,, , to enable not only high IR emissivity but also high solar reflectance for outdoor applications.…”
Section: Introductionmentioning
confidence: 99%
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“…Lack of temperature preservation ability of radiation cooling materials, and the side-effect of non-radiative heat absorption, seriously limits the application of passive radiation cooling materials. By enhancing the thermal resistance of the bottom surface [ 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 ] and enlarging the radiation channel of the top surface, designing a multi-layer materials structure is a worthy solution to break the application limitations of radiation cooler. Wang et al [ 62 ] prepared ultra-high foaming rate polyethylene aerogel with high solar reflectivity (92.2%, 6 mm thickness), high infrared transmittance (79.9%, 6 mm thickness), low thermal conductivity (28 mW/m/K) and was excellently insulated.…”
Section: Introductionmentioning
confidence: 99%
“…As a result, daytime radiative coolers always demonstrate low absorptivity in the solar spectrum regions and high emissivity in the mid-infrared wavelength region. Recently, many works have been published and display different designs of daytime radiative coolers, such as multilayer photonic structures, ,, porous polymer structures, nanocomposite-based films, and metamaterials. As an energy-saving and potential cooling technology, passive daytime radiative cooling has broad prospects in numerous fields, including building cooling, textiles cooling, and efficient solar cells. …”
mentioning
confidence: 99%