New Sustainable Coatings from Umeå University Could Strengthen the Competitiveness of Solar Thermal Energy
Researchers at Umeå University have developed innovative optical coatings that enhance both the efficiency and durability of solar thermal collectors. Using nanomaterials and low-cost, environmentally friendly manufacturing methods, the technology could make solar heat a more competitive fossil-free energy source—especially for industrial applications.
The work, carried out within the Industrial Doctoral School, focuses on two key components of solar collectors: the cover glass and the receiver. For the glass, the team developed a new anti-reflective silica coating that improves light transmission while also protecting against dirt, moisture, and scratches. For the receiver, two solutions were explored: a cobalt-chromium coating and a composite film made from carbon nanotubes and silica—both designed to maximize solar absorption and minimize heat loss through thermal radiation.
The research was conducted in close collaboration with Absolicon Solar Collector in Härnösand, and the results are directly tailored to the company’s technology. Two patent applications have already been filed, and the findings show strong potential for scalable and sustainable production.
“Our research shows it’s possible to combine high performance with environmentally friendly materials and methods—a key step toward making solar thermal energy a viable alternative to fossil fuels at industrial scale,” says Erik Zäll, PhD student at Umeå University.
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Photo: Absolicon (Absolicon T160)