1. Erlangen Graduate School in Advanced Optical Technologies; University of Erlangen-Nuremberg; Erlangen 91052 Germany
2. Institute of Engineering Thermodynamics; University of Erlangen-Nuremberg; Erlangen 91058 Bavaria Germany
3. Department of Anesthesiology and Intensive Care; University of Erlangen-Nuremberg; Erlangen 91054 Germany
4. ESYTEC Energie- und Systemtechnik GmbH; Am Weichselgarten 6 Erlangen 91058 Germany
5. Institute of Engineering Thermodynamics; University of Siegen; Siegen 57076 Germany