Development of a novel hollow glass microsphere-based radiative cooling coating to achieve passive cooling in buildings

I&T Solution Development of a novel hollow glass microsphere-based radiative cooling coating to achieve passive cooling in buildings
(REF : S-0841)
Matched I&T Wish
Trial Project
Solution Feature
  • The novel cool roof coating is equipped with excellent spectral properties, including high solar reflectance in the wavelength range from 0.3 to 2.5 µm and high thermal emittance in the infrared wavelength range over 3 µm.
  • The proposed novel nanocoating will show low thermal conductivity to strengthen the overall thermal insulation capability.
  • The coating surface will be chemically treated with super-hydrophilic properties to achieve self-cleaning, and thus to sustain the long-term effective spectral features. Moreover, the surface deposited organic can be automatically broken down.
  • The coating has the ability to be mass-produced for large-scale applications.
  • The coating formulas can be flexibly adjusted in accordance with different thermal requirements.
Trial Application and Expected Outcome
  • The coating will be spectrally optimized through full spectrum measurements by investigating appropriate formula methods and optimal size diameters and distributions of the embedded hollow glass microspheres.
  • The optimized cool roof nanocoating will be utilized to conduct comprehensive on-site chamber tests by applying it on the chamber top surfaces to thoroughly evaluate its thermal performance so as to assess its cooling potential.
  • The coating surface cleanness and spectral properties will be compared before and after a long-term external exposure so as to evaluate the surface hydrophilic-based self-cleaning effectiveness and its ability to break down organic dirt and bacteria.
  • A building prototype will be chosen for on-site applications of the novel cool roof coating. Furthermore, simulation-based annual thermal and energy evaluation will be conducted with considering the integration of the coating as roof surfaces.
  • A guidance report will be formulated in detail for the development, optimization and application of the hollow glass microsphere-based radiative cool roof coating in buildings.
Additional Solution Information Form of EM innoPortal-05102020 (Public).docx
Info on I&T Solution Provider
Solution Provider:The Hong Kong Polytechnic University
Address:Dept. of Building Services Engineering, The Hong Kong Polytechnic University
Contact Person:LU Lin
Tel: 852 - 3400 3596

For details of the above I&T solution, please contact the I&T solution provider.