A new approach in designing pigmented coatings considering both visual and thermal concerns was introduced by authors in previous works. The objective was to design a pigmented coating with dark appearance which can stay cool while exposed to sunlight. This behavior can be achieved by coating a typical black substrate with a pigmented coating with controlled size and concentration of particles and coating thickness. In present work, the spectral behaviour of polydisperse TiO 2 pigmented coatings was studied. The radiative properties of polydisperse TiO 2 powders were evaluated and the radiative transfer in the pigmented coating was modelled using the radiation element method by ray emission model (REM 2). The effects of particles size distribution on spectral reflectivity, optimization parameter, and color coordinates were discussed. The results of numerical calculation were validated by experimental reflectivity measurements of several TiO 2 pigmented coating samples made from two different TiO 2 powders with different size distributions of particles. The results show that our model can reasonably predict the spectral reflectivity of TiO 2 pigmented coating samples. Moreover, the results of optimized monodisperse TiO 2 pigmented coatings were again validated.
|Number of pages||13|
|Journal||Journal of Quantitative Spectroscopy and Radiative Transfer|
|Publication status||Published - 2012 May|
- Aesthetic performance
- Pigmented coating
- Polydisperse particles
- Titanium dioxide