Size-Dispersed Calcium Phosphate-Based Paints for Sustainable, Durable Cool Roof Applications

Andrew Caratenuto, Sunny Leung, Nathaniel LeCompte and Yi Zheng ()
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Andrew Caratenuto: Department of Mechanical and Industrial Engineering, Northeastern University, Boston, MA 02115, USA
Sunny Leung: Planck Energies Inc., Boston, MA 02135, USA
Nathaniel LeCompte: Planck Energies Inc., Boston, MA 02135, USA
Yi Zheng: Department of Mechanical and Industrial Engineering, Northeastern University, Boston, MA 02115, USA

Energies, 2024, vol. 17, issue 16, 1-10

Abstract: Passive radiative cooling materials are widely recognized as attractive innovations for reducing emissions and expanding life-saving cooling access. Despite immense research attention, the adoption of such technologies is limited largely due to a lack of scalability and cost compatibility with market needs. While paint and coating-based approaches offer a more sensible solution, many demonstrations suffer from issues such as a low solar reflectance performance or a lack of material sustainability due to the use of harmful solvents. In this work, we demonstrate a passive radiative cooling paint which achieves an extremely high solar reflectance value of 98% using a completely water-based formulation. Material sustainability is promoted by incorporating size-dispersed calcium phosphate biomaterials, which offer broadband solar reflectance, as well as a self-crosslinking water-based binder, providing water resistance and durability without introducing harmful materials. Common industry pigments are integrated within the binder for comparison, illustrating the benefit of finely-tuned particle size distributions for broadband solar reflectance, even in low-refractive-index materials such as calcium phosphates. With scalability, outdoor durability, and eco-friendly materials, this demonstrated paint offers a practical passive radiative cooling approach without exacerbating other environmental issues.

Keywords: calcium phosphate; solar reflectance; cool roof; paint; sustainability (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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