1. Institute of Applied Mechanics TU Kaiserslautern 67653Kaiserslautern Germany
2. Laboratory of Engineering Thermodynamics TU Kaiserslautern 67653Kaiserslautern Germany
3. Faculty 7 University of Stuttgart 70569Stuttgart Germany
4. Thermal Separation Science (endowed professorship of the state tyrol) University of Innsbruck 6020Innsbruck Austria