1. Risø National Laboratory for Sustainable Energy; Technical University of Denmark; AFM-228, Frederiksborgvej 399; DK-4000; Roskilde; Denmark
2. Knowledge Centre WMC; Kluisgat 5; 1771 MV; Wieringerwerf; The Netherlands
3. Centre for Renewable Energy Sources and Saving; 19th km Marathonos Ave.; GR-190 09; Pikermi; Greece
4. University of Patras; Department of Mechanical Engineering and Aeronautics; PO Box 1401; GR-26504; Panepistimioupolis Rio; Greece