- Author
- Didion, D. A. | Kim, M. S.
- Title
- REFLEAK: NIST Leak/Recharge Simulation Program for Refrigerant Mixtures. Version 2.0. User's Guide. NIST Standard Reference Database 73.
- Coporate
- National Institute of Standards and Technology, Gaithersburg, MD
- Report
- NIST Standard Reference Database 73, September 1999, 24 p.
- Distribution
- AVAILABLE FROM: National Institute of Standards and Technology, Standard Reference Data Program, 100 Bureau Drive, Stop 2310, Gaithersburg, MD 20899-2310. Telephone: 301-975-2008. Fax: 301-926-0416. E-mail: srdata@nist.gov. Website: http://www.nist.gov/srd/fluids.htm
- Keywords
- refrigerants | simulation | equations of state
- Abstract
- As alternative refrigerants to ozone depleting materials, mixtures of two or more refrigerants are being utilized as working fluids in heat pumping, air conditioning, and refrigeration systems. Generally, these mixtures form zeotropes, which show temperature and composition changes during any evaporation, condensation, or flashing process whether it be intended (i.e., through an expansion device) or unintended such as a leak from a refrigerant container or system. For the zeotropic mixtures, it may be important to predict the composition change utider any of these leak conditions. This REFLEAK program simulates leak and recharge processes for refrigerant zeotropic mixtures. This Windows-based program provides an easy-to-use package that allows estimation of composition changes of the zeotropic mixtures in leak and recharge processes for either vapor or liquid leaks under isothermal or adiabatic conditions. Studies related to the leak process of refrigerant mixtures were performed. Leak experiments of refrigerant mixtures have been compared with the simulation results. Thermodynamic properties of refrigerant mixtures are calculated based on the NIST Thermodynamic and Transport Properties of Refrigerants and Refrigerant Mixtures Database (REFPROP) Version 6.01. The objective in selecting property models, for use in REFPROP was to implement the most accurate models currently available. The user should be aware that the uncertainties in these models vary considerably depending on 'the fluid, property, and thermodynamic state. It is thus impossible to give a simple, global statement of uncertainties. Even for the most-studied fluids with equations of state based on accurate, wide-ranging data, uncertainties are complicated functions of the temperature and pressure. The interested user is referred to REFPROP's original literature sources for details. CONTACTS: If you have comments or questions about the database, the Standard Reference Data Program would like to hear from you. Also, if you should have any problems with the diskettes or installation, please let us know by contacting: Joan Sauerwein, National Institute of Standards and Technology, Standard Reference Data Program, 100 Bureau Drive, Stop 2310, Gaithersburg, MD 20899-2310. Internet: srdata@nist.gov Phone: (301) 975-2208 FAX: (301) 926-0416 Website: http://www.nist.gov/srd or If you hve questions or or problems pertaining to the data or use of the database program, contact Dr. David A Didion, National Institute of Standards and Technology, Building and Fire Research Laboratory, 100 Bureau Drive, Stop 8631, Gaithersburg, MD 20899-8631. Telephone: 30-975-5881, Fax: 301-975-0485, Email: david.didion@nist.gov