Solution theory model for thermophysical properties of refrigerant/lubricant mixtures

ABSTRACT: A general model for predicting the thermos physical properties of refrigerant/lubricant mixtures has been developed based on applicable theory for the excess Gibbs energy of non-ideal solutions. In our approach, flexible thermodynamic forms are chosen to describe the properties of both the gas and liquid phases of refrigerant/lubricant mixtures. After an extensive study of models for describing non ideal liquid effects, the Wohl [3]-suffix equations, which have been extensively used in the analysis of hydro-carbon mixtures, have been developed into a general form applicable to mixtures where one component is a polyolester or alkylbenzene lubricant. We have developed anon ideal solution computer code, based on the Wohl model that predicts dew point orbubble point conditions over a wide range of composition and temperature and includes the calculation of the enthalpy and entropy of refrigerant/lubricant mixtures. Our present analysis includes the thermodynamic properties of an ideal solution mixture and the corrections due to non-ideal solution behavior. These non-ideal solution corrections are based on analysis of the excess Gibbs energy of the mixture. We find that these non-ideal solution corrections are small (\4%) for most refrigerant/lubricant mixtures, except at very low temperatures.

• Autores: Restrepo Cossio, Albeiro Alonso; Bent, Gary; Michels, Harvey
• Tipo de recurso: Article of investigation
• Fecha de publicación: 2009
• Institución: Universidad de Antioquia
• Repositorio: Repositorio UdeA
• Idioma: eng
• OAI Identifier: oai:bibliotecadigital.udea.edu.co:10495/26740
• Acceso en línea: http://hdl.handle.net/10495/26740
• Palabra clave: Refrigerants; Refrigerantes; Solubility; Solubilidad; Enthalpy; Entalpía; Entropy; Entropía; Density; Densidad; http://aims.fao.org/aos/agrovoc/c_2186; Thermophysical propertie; Polyolester; Alkylbenzen; Non-ideal solution; Heat capacity; http://aims.fao.org/aos/agrovoc/c_28326; http://aims.fao.org/aos/agrovoc/c_7233; http://aims.fao.org/aos/agrovoc/c_641424d2; http://aims.fao.org/aos/agrovoc/c_1fc62594
• Rights: openAccess
• License: http://creativecommons.org/licenses/by-nc-nd/2.5/co/