1. Assistant Professor, Building Physics and Systems, Technische Univ. Eindhoven, P.O. Box 513, 5600 MB Eindhoven, The Netherlands (corresponding author).
2. Professor, Centre for Building Studies, Dept. of Building, Civil and Environmental Engineering, Concordia Univ., 1455 de Maisonneuve Blvd. West, Montreal PQ, Canada H3G 1M8.
3. Professor, Chair of Building Physics, Swiss Federal Institute of Technology ETHZ, ETH-Hönggerberg, CH-8093 Zürich, Switzerland; and, Empa, Swiss Federal Laboratories for Materials Testing and Research Laboratory for Building Technologies, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland.