[1] Fraunhofer Inst Syst & Innovat Res ISI, Karlsruhe, Germany
[2] Univ Freiburg, Dept Sustainable Syst Engn INATECH, Freiburg, Germany
[3] Fraunhofer IEG, Fraunhofer Res Inst Energy Infrastruct & Geotherm, Karlsruhe, Germany
[4] Fraunhofer Inst Ind Engn IAO, Stuttgart, Germany