Comprehensive evaluation and analysis of a porous polymer coating for highly efficient passive radiative cooling

Gao, Yongfeng; Song, Xihao; Zhang, Peng

doi:10.1016/j.solmat.2022.112081

Cited by 18 publications

(2 citation statements)

References 40 publications

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“…At this point, superhydrophobic materials with self-cleaning properties raised concerns. Polymeric materials such as poly(dimethylsiloxane) (PDMS), − PVDF, , P(VDF–HFP), − and so on not only provide superhydrophobic interfaces with low surface energy but also exhibit excellent RC performance. Xue et al used phase separation technology to prepare SiO 2 /P(VDF–HFP)-based superhydrophobic RC composite membranes.…”

Section: Introductionmentioning

confidence: 99%

Durable Self-Cleaning Radiative Cooling Coatings for Building Energy Efficiency

Ju,

Long,

Yang

et al. 2024

ACS Appl. Mater. Interfaces

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Section: Introductionmentioning

confidence: 99%

Durable Self-Cleaning Radiative Cooling Coatings for Building Energy Efficiency

Ju,

Long,

Yang

et al. 2024

ACS Appl. Mater. Interfaces

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“…A micro-structured polyethylene film fabricated through a scalable hot embossing lithography (named HELPE), enabling good superhydrophobic properties and, therefore, excellent self-cleaning performance as a universal protective layer for most PDRC materials, has been manufactured and tested against standard polyvinyl diene fluoride (PVDF) and PVDF + PE thin films [30]. Another attempt has been made using a nanoporous PE film that presents a temperature drop with respect to the ambient temperature but measuring the ambient temperature in a micro-environment close to the samples [31].…”

Section: Introductionmentioning

confidence: 99%

Radiative cooling performance of a modified paint formulation with an integrated UV and convection shielding layer

Lio,

Levorin,

Erdogan

et al. 2024

Preprint

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Passive radiative cooling (PRC) technology promises to reduce a significant fraction of our energy needs and carbon footprint associated with cooling. Among different approaches, paint-like systems present several advantages in cost-effectiveness, scalability, and application ease. We report on a PRC system consisting of a paint mixture modified with 50 %wt glass bubbles and a top polypropylene-polyethylene-polypropylene (PP-PE-PP) film typically used as a battery separator. The resulting material exhibits a solar reflectance of 94 % and an absorption (evaluated by Attenuated Total Reflectance spectroscopy) with a peak at 10 µm of 60 %. The addition of the glass bubbles and the top film increases the paint reflectance over the solar spectrum and the UV, thanks to the nanoporous PP-PE-PP film (NPF), while allowing most thermal radiation through, shielding from convection, and making the coating more easily washable. The material has been tested under realistic outdoor conditions, checking the different performance obtained when sticking the PP-PE-PP film directly onto the wet paint layer or by using it as a separate windshield enclosing the sample test chamber. Despite its high solar reflectance, no radiative cooling is observed with respect to ambient temperature during the peak hours (solar irradiation >500 W m −2). Below this threshold, a temperature drop of −3 °C and a cooling power exceeding 100 W m−2 is observed. Notably, even using a visibly opaque convection shield, the configuration where the PP-PE-PP film seals the sample results in a substantial overheating of the air pocket surrounding the sample , which is detrimental to obtaining a temperature drop with respect to the true ambient temperature.

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Zeolitic Imidazolate Framework ‐8‐Based Passive Daytime Radiative Cooling Paint for Energy‐Efficient Cooling

Lim,

Park,

Chae

et al. 2024

Adv Energy and Sustain Res

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Increased energy consumption, driven by climate change and the rise of new industries, has spurred a demand for alternative cooling technologies to replace energy‐intensive systems and mitigate environmental pollution. Radiative cooling, leveraging the optical properties of materials to cool without emitting pollutants or consuming energy, is considered a suitable solution. Among the various form of radiative cooling devices, paint stands out as a practical application for radiative cooling. Hence, a passive daytime radiative cooling (PDRC) paint is developed using a polyurethane binder and zeolitic imidazolate framework (ZIF)‐8. ZIF‐8 is synthesized in an environmentally friendly manner using deionized water as the solvent, resulting in paint with a reflectance of 94.9%, emissivity of 94%, and cooling power of 113 W m−2. Temperature measurements reveal that the paint reduced ambient temperatures by an average of 5.7 °C, reaching up to 8.1 °C during the day. Additionally, with a self‐assembly monolayer coating, the PDRC surface exhibited super‐hydrophobicity and self‐cleaning capabilities. Therefore, the proposed ZIF‐8‐based PDRC paint offers sub‐room temperature cooling potential and is anticipated to reduce energy consumption for cooling, thereby alleviating environmental pollution in various applications, particularly in building exteriors.

show abstract

Comprehensive evaluation and analysis of a porous polymer coating for highly efficient passive radiative cooling

Cited by 18 publications

References 40 publications

Durable Self-Cleaning Radiative Cooling Coatings for Building Energy Efficiency

Durable Self-Cleaning Radiative Cooling Coatings for Building Energy Efficiency

Radiative cooling performance of a modified paint formulation with an integrated UV and convection shielding layer

Zeolitic Imidazolate Framework ‐8‐Based Passive Daytime Radiative Cooling Paint for Energy‐Efficient Cooling

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