1. Karlsruhe University of Applied Sciences,Faculty of Management Science and Engineering,Germany
2. Fraunhofer Institute for Solar Energy Systems (ISE),Freiburg,Germany
3. Institute of Refrigeration, Karlsruhe University of Applied Sciences,Air-Conditioning, and Environmental Engineering (IKKU),Germany
4. University of Freiburg,Systems Control and Optimization Laboratory,Department of Microsystems Engineering (IMTEK),Germany