文档介绍：Zittau/Görlitz University of Applied Sciences
Department of Technical Thermodynamics
.de
Thermodynamic Properties for Real Moist Air,
Dry Air, Steam, Water, and Ice (ASHRAE RP-1485)
Authors: Sebastian Herrmann, ASHRAE
Dr. Hans-Joachim Kretzschmar, Professor, ASHRAE
Zittau/Görlitz University of Applied Sciences, Zittau, Germany
Donald P. Gatley, ASHRAE Fellow
Gatley & Associates, Inc., Atlanta, GA
ASHRAE 2010 Winter Conference, January 23-27, 2010, Orlando, FL
Outline
►• Background
►• ASHRAE Research Project RP-1485
►• Underlying Properties
–Dry Air
– Steam, Water, and Ice
►• Psychrometric Equations
►•Results
►• Conclusions
Herrmann, S., Kretzschmar, H.-J., Gatley, D. P., RP-1485, ASHRAE Conference, Orlando, FL, 2010 2
Background
Prior ASHRAE Real Moist Air Psychrometric Research
• Goff and Gratch Research (1943-1949):
– Originated the enhancement factor, provided equations for its calculation
– Basis for ASHRAE charts and tables up to 1981
• Hyland and Wexler Research (1978-1983):
– Complete update of the former model
– Including new slightly modified physical constants
– Ice formulation used worldwide up to 2006
– Update the ASHRAE Handbook moist air tables
• Nelson and Sauer Research (1999-2001):
– Extension in temperature up to 320°C
– Updates only above 0°C, change to ITS-90 temperature scale
Herrmann, S., Kretzschmar, H.-J., Gatley, D. P., RP-1485, ASHRAE Conference, Orlando, FL, 2010 3
Background
Projects at the Zittau/Görlitz University of Applied Sciences regarding
Moist Air and Steam and Water
•“Advanced pressed Air Energy Storage”(AA-CAES)
Project of the European Union (2003-2006)
– PTB Report “Determination of Thermodynamic and Transport Properties of
Humid Air for Power Cycle Calculations”
– Paper in ASME Journal of Engineering for Gas Turbines and Power
(April 2010)
•“Industrial Formulation IAPWS-IF97” and “Supplementary Releases on
Backward Equations for IAPWS-IF97”