The activity of the working group comprises research on materials employed in solar electricity, process heat and fuel generation. It focuses on functional high-temperature materials, which are characterized and investigated in terms of applications in concentrated radiation → heat conversion processes (solar air receiver) as well as in non-solar applications with similar physical phenomena involved. Typical examples are the Diesel-engine particle filter, the porous gas turbine combustion chamber wall or the compact high temperature heat exchanger. Furthermore the work focuses on the characterization of heat and mass transfer processes in porous materials with numerical models. Projects are carried out with internal and external partners from R&D institutions and industry. For the experimental characterization a number of instruments and set-ups for determining thermo-physical properties as well as flow characteristics are available such as permeability and dissipative effects .