1Department of Civil and Archictectural Engineering, Division of Building Technology, KTH – The Royal Institute of Technology, SE 10044 Stockholm, Sweden
2EMPA-Swiss Federal Labarotories for Materials Testing and Research, Energy Systems/Building Equipment Laboratory, CH-8600 Dübendorf, Switzerland
3Th.Baumgartner und Partner AG, CH-8600 Dübendorf, Switzerland