WAter BAsed SELective COATings for intelligent facade collectors - WABASELCOAT

Project summary

Solar absorbers incorporated in façades systems become a reality in the modern architecture, although they do not fulfil completely the demands of costumers. In this respect coloured spectrally selective paint coatings are required. Water-borne thickness insensitive spectrally selective coatings with anti-soiling effect are one of the optimal choices since they offers the possibility of achieving high solar to thermal conversion efficiency, longevity and high aesthetic demands of architects. At present, the practical use is faced with three major problems: i) nonselective coatings are used for increase the absorptivity, ii) coatings are made by solvent-borne resins, high volatile organic solvents (VOC)emission and iii) the dust and dirt are collected on the absorber surface resulting in decreased efficiency. The effectiveness can be improved using black or coloured spectrally selective inorganic and metallic pigments incorporated in water-borne resins with low thermal emittance result