Solar Thermal Panels: Black is Back!

Solar thermal panels developed at EPFL are are dressed up in unique and patented new materials. Researchers created a stronger black coating that retains its original color and thereby its absorption properties much longer than traditional panels. Like most elements of a building, the lifespan of a solar thermal panel is between 25 and 30 years. To slow the aging process and maintain their performance, a team of researchers from EPFL have, in rapid succession, improved the black coating used for thermal sensors and developed an original and patented method for depositing the coating. The color black is at the key element of thermal panels because it can absorb up to 90% of the energy it receives. However, over time, the effects of light and heat deteriorate the black, and the panel becomes less efficient. Engineers have developed an innovative process that deposits thin layers of 3 different materials that are more resistant, more selective and less toxic than the chromium used thus far.