1. Energy
and Environment Research Department, Paul Scherrer Institut (PSI), 5232 Villigen PSI, Switzerland
2. University of Applied Sciences Northwestern Switzerland (FHNW), 5210 Windisch, Switzerland
3. Zurich University of Applied Sciences (ZHAW), 8820 Wädenswil, Switzerland
4. ENAC-IIE, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland