1. Institute for Renewable Energy, European Academy of Bolzano (EURAC Research), Viale Druso 1, 39100 Bolzano, Italy
2. Directorate-General for Energy (DG Energy), European Commission, Unit B3: Buildings and Products, 1049 Brussel, Belgium
3. Center for Energy Efficient Systems (CES), Department of Energy and Processes (DEP), Mines ParisTech, PSL University, 60 Boulevard Saint-Michel, CEDEX 06, 75272 Paris, France
4. Energy Economics Group, Institute of Energy Systems and Electric Drives, TU Wien, Gusshausstrasse 25-29/370-3, 1040 Vienna, Austria
5. Planetek Italia, Via Massaua 12, 70132 Bari, Italy