Vapor-liquid equilibria for an R134a/lubricant mixture: Measurements and equation-of-state modeling
The authors measured bubble point pressures and coexisting liquid densities for two mixtures of R-134a and a polyolester (POE) lubricant. The mass fraction of the lubricant was approximately 9% and 12%, and the temperature ranged from 280 K to 355 K. The authors used the Elliott, Suresh, and Donohue (ESD) equation of state to model the bubble point pressure data. The bubble point pressures were represented with an average absolute deviation of 2.5%. A binary interaction parameter reduced the deviation to 1.4%. The authors also applied the ESD model to other R-134a/POE lubricant data in the literature. As the concentration of the lubricant increased, the performance of the model deteriorated markedly. However, the use of a single binary interaction parameter reduced the deviations significantly.
- Research Organization:
- National Inst. of Standards and Technology, Boulder, CO (US)
- OSTI ID:
- 20104833
- Resource Relation:
- Conference: ASHRAE Winter Meeting, Dallas, TX (US), 02/05/2000--02/09/2000; Other Information: PBD: 2000; Related Information: In: ASHRAE Transactions 2000; Volume 106, Part 1, 929 pages.
- Country of Publication:
- United States
- Language:
- English
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