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Development of Microparticle Implanted PVDF-HF Polymer Coating on Building Material for Daytime Radiative Cooling
Usman Saeed1, Mohamed Mahfoodh Saleh Altamimi1, Hamad Al-Turaif1
1Chemical and Materials Engineering Department, Faculty of Engineering, King Abdulaziz University, Jeddah 21589, Saudi Arabia.
Polymers
|May 11, 2024
Summary
A new single-layer coating using barium sulfate/titanium dioxide microparticles in PVDF-HF polymer offers efficient passive daytime radiative cooling. This innovative material achieves significant cooling below ambient temperatures, demonstrating potential for sustainable building solutions.
Area of Science:
- Materials Science
- Nanotechnology
- Sustainable Energy
Background:
- Radiant cooling is a promising passive method for reducing energy consumption and mitigating urban heat.
- Existing radiative cooling solutions often involve complex structures, high costs, or metallic reflective layers, limiting widespread application.
- Single-layer paints for passive daytime radiative cooling typically require dense coatings and show limited effectiveness.
Purpose of the Study:
- To investigate a single-layer coating for passive daytime radiative cooling.
- To evaluate the cooling performance of BaSO4/TiO2 microparticles within PVDF-HF polymer on a concrete substrate.
- To optimize the concentration of microparticles for enhanced cooling properties.
Main Methods:
- Fabrication of a single-layer coating using BaSO4/TiO2 microparticles dispersed in PVDF-HF polymer.
- Characterization of optical properties, including solar absorbance, reflectance, and thermal emissivity.
- Evaluation of surface properties like hydrophobicity (water contact angle).
- Measurement of sub-ambient cooling temperatures under solar irradiance.
Main Results:
- The 30% BaSO4/TiO2/PVDF-HF coating exhibited high solar reflectance (95.0%) and emissivity (95.1%).
- Micro-pores in the PVDF polymer structure enhanced solar reflectance without affecting thermal emissivity.
- The coating achieved a cooling effect of 5.1 °C and 3.9 °C below ambient temperature under 900 W/m2 solar irradiance.
- The developed coating demonstrated hydrophobicity with a 117.1° water contact angle and a figure of merit of 0.60.
Conclusions:
- The 30% BaSO4/TiO2/PVDF-HF microparticle coating is a highly effective single-layer solution for passive daytime radiative cooling.
- The coating offers excellent solar reflectivity, high emissivity, and desirable hydrophobicity.
- This material presents a scalable, reliable, and manufacturable option for sustainable cooling applications.
