FNR-The Development of Experimentally Validated Numerical Design Tools for Ideal Solar Selective Absorbers

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This is a proposal for a joint research programme involving Swansea University (SU) and the Luxembourg Institute of Science and Technology (LIST)The development of sustainable energy is one of the key scientific challenges of the 21st century. Environmental concerns have led to an increased interest in the use of solar energy as an alternative to fossil fuel based energy sources. In the solar energy field, significant research attention is being given to the processes of collection and storage, either in the form of heat or by direct conversion to electricity. The most important part of solar collectors is the solar selective coatings, which directly affect the efficiency of the system.New nano-structured metamaterial based absorbers have many benefits over conventional absorbers, such as miniaturisation, adaptability and frequency tuning. However, there are two major challenges in producing these new metamaterial based absorbers. The first is to find the optimal nanostructure design, while the second is its synthesis within current nano-technological limits. The project address the first challenge via a new multi-scale computational framework. Advanced computational techniques will be develop to perform the simulations at the nano-scale and explore the vast design space for the nano-structure. A novel methodology to couple the nano and micro scales will be developed and implemented and an optimisation technique applied at the micro scale to find the optimal nano-structure.The second challenge will be addressed by employing the unique world prototype machine at LIST capable of fabricating/replicating nano/micro metallic structures by electrochemical deposition. The chemical stability of the materials employed at the nano-scale will also be considered with the objective to guarantee chemical stability at high temperatures, with the aim of boosting light absorption efficiency.