[article]
| Titre : |
Reducing global warming with ultra-white paint |
| Type de document : |
texte imprimé |
| Auteurs : |
Xiangyu Li, Auteur ; Joseph Peoples, Auteur ; Peiyan Yao, Auteur ; Xiulin Ruan, Auteur |
| Année de publication : |
2021 |
| Article en page(s) : |
p. 51-56 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Blanc (couleur)
Nanoparticules
Polyacryliques
Réflectance
Refroidissement radiatif
Revêtements:Peinture
Sulfate de baryum
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Radiative cooling is a passive cooling technology that offers great promises to reduce space cooling cost, combat the urban island effect and alleviate global warming. To achieve passive daytime radiative cooling, current state-of-the-art solutions often utilise complicated multilayer structures or a reflective metal layer, limiting their applications in many fields.
Attempts have been made to achieve passive daytime radiative cooling with single-layer paints, but they often require a thick coating or show partial daytime cooling.
In this work, we experimentally demonstrate remarkable full-daytime subambient cooling performance with both BaSO4 nanoparticle films and BaSO4 nanocomposite paints. BaSO, has a high electron band gap for low solar absorptance and phonon resonance at 9pm for high sky window emissivity. With an appropriate particle size and a broad particle size distribution, the BaSO4 nanoparticle film reaches an ultrahigh solar reflectance of 97.6% and a high sky window emissivity of 0.96. During field tests, the BaSO4 film stays more than 4.5°C below ambient temperature or achieves an average cooling power of 117W/m2. The BaSO4-acrylic paint is developed with a 60% volume concentration to enhance the reliability in outdoor applications, achieving a solar reflectance of 98.1% and a sky window emissivity of 0.95. Field tests indicate similar cooling performance to the BaSO4 films.
Overall, our BaSO4-acrylic paint shows a standard figure of merit of 0.77, which is among the highest of radiative cooling solutions while providing great reliability, convenient paint form, ease of use and compatibility with the commercial paint fabrication process. |
| Note de contenu : |
- BaSO4 nanoparticle film and BaSO4-acrylic paint fabrication
- Spectral emissivity characterisation
- Field test
- Monte Carlo simulation |
| En ligne : |
https://drive.google.com/file/d/1Ea2XP_Bm6sPfpd-MmDAN2bt8uarSulal/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36772 |
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 211, N° 4671 (10/2021) . - p. 51-56
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