Vapor-Liquid Equilibria for an R134a/Lubricant Mixture: Measurements and Equation-of-State Modeling

Published

February 1, 2000

Author(s)

Marcia L. Huber, C D. Holcomb, Stephanie L. Outcalt, J. R. Elliott

Abstract

We 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 (44 F to 179 F). We used the Elliott, Suresh, and Donohue (ESD) equation of state to model our bubble point with an average absolute deviation of 2.5%. A binary interaction parameter reduced the deviation to 1.4%. We 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.

Proceedings Title

American Society of Heating, Refrigerating and Air-Conditioning Engineers, Winter Meeting | | | ASHRAE

Volume

106

Issue

Pt. 1

Conference Dates

February 1, 2000

Conference Title

ASHRAE Transactions

Pub Type

Conferences

Keywords

bubble point pressures, lubricant, refrigerant, thermophysical properties

Citation

Huber, M. , Holcomb, C. , Outcalt, S. and Elliott, J. (2000), Vapor-Liquid Equilibria for an R134a/Lubricant Mixture: Measurements and Equation-of-State Modeling, American Society of Heating, Refrigerating and Air-Conditioning Engineers, Winter Meeting | | | ASHRAE (Accessed October 13, 2025)