Modeling bubble points of mixtures of hydrofluorocarbon refrigerants and polyol ester lubricants

• Published in: Fluid phase equilibria Vol. 194; pp. 511 - 519
• Main Authors: Huber, M.L., Lemmon, E.W., Friend, D.G.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 30-03-2002
• Subjects: Density; Lubricant; Polyol ester; Refrigerant; Vapor–liquid equilibria; Polyol ester; Density; Refrigerant; Vapor–liquid equilibria; Lubricant
• ISSN: 0378-3812; 1879-0224
• DOI: 10.1016/S0378-3812(01)00655-0

We use a Helmholtz energy mixing model to describe the bubble point pressures of mixtures of hydrofluorocarbon refrigerants and polyol ester (POE) based lubricants. This model incorporates the best available equations of state for the refrigerants, is valid over the entire range of composition, is not limited to states below the refrigerant critical temperature, and can represent volumetric properties in addition to calculating reliable phase equilibria. As part of the approach, we developed equations that can be used to apply a simplified statistical associating fluid theory (SSAFT) equation of state to POE-based lubricants. We compare the predictions of the model with selected experimental data available in the literature for bubble point pressures and saturated liquid densities of these systems.