Hans-Joachim Kretzschmar is Professor of Technical Thermodynamics at the Zittau/ Goerlitz University of Applied Sciences and specialises in the calculation of the properties for working fluids in heat cycles, boilers and turbines. The property libraries for water and steam, humid air and humid combustion gases developed by his group are used worldwide in more than 100 companies, institutions and universities. Prof. Kretzschmar is an active member of the International Association for the Properties of Water and Steam (IAPWS) and Vice Chairman of the IAPWS Working Group on "Thermophysical Pro...