Journal
ENERGY AND BUILDINGS
Volume 271, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.enbuild.2022.112296
Keywords
FDTD; Cooling; Coatings; Nanoparticles; Titanium dioxide (TiO2)
Funding
- FEDER through COMPETE2020-Programa Operacional Competitividade e Internacionalizacao (POCI) [PTDC/ECI-CO N/28766/2017-POCI-01-0145-FEDER-028766]
- national funds (PIDDAC) through FCT/MCTES
- Base Funding of the CONSTRUCT-Instituto de I&D em Estruturas e Construcoes - FCT/MCTES (PIDDAC) [UIDB/04708/2020]
- FCT - Fundacao para a Ciencia e a Tecnologia [SFRH/BD/148785/2019]
- Environment, Climate Change and Low Carbon Economy Programme
- Fundação para a Ciência e a Tecnologia [SFRH/BD/148785/2019] Funding Source: FCT
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Passive cooling of buildings can be achieved by enhancing the reflectance of coatings under sunlight. Embedding nanoparticles in coatings can significantly improve their reflectance, providing potential applications in temperature regulation.
Passive cooling of buildings under sunlight can be achieved by enhanced coating reflectance. Embedding micro/nano-sized objects, such as nanoparticles, in a lossless material like a polymer, may serve the purpose of reflecting the desired spectrum. The knowledge of the behavior of pigments in the infrared region is therefore a critical factor in formulating coatings to specific requirements. Finite-difference time-domain (FDTD) simulations, which can simulate the propagation of electromagnetic waves in a medium, were here used to investigate the influence of nanoparticle additives on coatings reflection and to explore the corresponding working principles to reveal coatings with high level of reflectance. The numerical simulations demonstrate the reflective behavior in the coating material, showing that embedded titanium dioxide (TiO2) nanoparticles can significantly improve the reflectance of coatings with maximum values of around 0.9 in average and 0.7 in the infrared for 250 nm radius and 50% particle volume fraction. Furthermore, the reflectance improvement saturates around 100 mu m coating thickness. The numerical values are also shown to model experimental results. (C) 2022 Elsevier B.V. All rights reserved.
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