Documents disponibles écrits par cet auteur

A departure-function approach to calculate thermodynamic properties of refrigerant-oil mixtures / Moisés A. Marcelino Neto in International journal of refrigeration, Vol. 36 N° 3 (Mai 2013) 

Public ISBD [article]  in International journal of refrigeration > Vol. 36 N° 3 (Mai 2013) . - pp. 972–979 Titre : A departure-function approach to calculate thermodynamic properties of refrigerant-oil mixtures Titre original : Approche fondée sur les fonctions pour le calcul des propriétés thermodynamiques des mélanges frigorigène-huile Type de document : texte imprimé Auteurs : Moisés A. Marcelino Neto, Auteur ; Jader R. Barbosa Jr., Auteur Année de publication : 2013 Article en page(s) : pp. 972–979 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Refrigerant;  Oil;  Mixtures;  Phase  equilibrium;  Thermodynamic  properties;  Function Résumé : A method based on the theory of departure functions coupled with the Peng and Robinson (1976) equation of state was used to calculate the thermodynamic properties (internal energy, enthalpy, entropy and specific volume) of refrigerant-oil mixtures. The method is exemplified with isobutane (R-600a)/alkyl benzene ISO 5 and isobutane/polyol ester ISO 7 mixtures. Pressure-enthalpy, pressure–volume and temperature–entropy diagrams are presented for overall oil concentrations ranging from 0.1% to 1%. The influence of the oil type on the working fluid properties is discussed. For a given overall oil concentration, the higher solubility of alkyl benzene ISO 5 (in comparison with polyol ester ISO 7) gives rise to larger deviations from the pure refrigerant behavior. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712003477 [article] A departure-function approach to calculate thermodynamic properties of refrigerant-oil mixtures = Approche fondée sur les fonctions pour le calcul des propriétés thermodynamiques des mélanges frigorigène-huile [texte imprimé] / Moisés A. Marcelino Neto, Auteur ; Jader R. Barbosa Jr., Auteur . - 2013 . - pp. 972–979. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 3 (Mai 2013) . - pp. 972–979 Mots-clés : Refrigerant;  Oil;  Mixtures;  Phase  equilibrium;  Thermodynamic  properties;  Function Résumé : A method based on the theory of departure functions coupled with the Peng and Robinson (1976) equation of state was used to calculate the thermodynamic properties (internal energy, enthalpy, entropy and specific volume) of refrigerant-oil mixtures. The method is exemplified with isobutane (R-600a)/alkyl benzene ISO 5 and isobutane/polyol ester ISO 7 mixtures. Pressure-enthalpy, pressure–volume and temperature–entropy diagrams are presented for overall oil concentrations ranging from 0.1% to 1%. The influence of the oil type on the working fluid properties is discussed. For a given overall oil concentration, the higher solubility of alkyl benzene ISO 5 (in comparison with polyol ester ISO 7) gives rise to larger deviations from the pure refrigerant behavior. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712003477

Experimental and theoretical analysis of CO2 absorption in polyolester oil using the PC - SAFT equation of state to account for nonideal effects / Moisés A. Marcelino Neto in Industrial & engineering chemistry research, Vol. 51 N° 2 (Janvier 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 2 (Janvier 2012) . - pp. 1027-1035 Titre : Experimental and theoretical analysis of CO2 absorption in polyolester oil using the PC - SAFT equation of state to account for nonideal effects Type de document : texte imprimé Auteurs : Moisés A. Marcelino Neto, Auteur ; Jader R. Barbosa, Auteur Année de publication : 2012 Article en page(s) : pp. 1027-1035 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Thermodynamic  properties  Equations  of  state  Gas  absorption  Carbon  dioxide Résumé : The purpose of this work is to study the absorption of carbon dioxide (CO2) through the free surface of a stagnant layer of polyolester oil in a closed cell via the pressure decay method. The system pressure and local temperatures in the vapor and liquid phases were recorded as a function of time for system temperatures of 25, 40, 55, and 70 °C. The tests were carried out for two initial heights of the liquid layer of 37 and 74 mm, respectively. The mass of CO2 that entered the cell was measured for each test. The data were used to validate a transient mass diffusion model that accounts for the departure from the ideal behavior. The model uses the PC-SAFT equation of state and incorporates the following nonideal effects: (i) gas compressibility in the vapor, (ii) liquid phase swelling, (iii) concentration-dependent nonideal density behavior, (iv) nonideal phase equilibrium at the vapor―liquid interface, and (v) concentration-dependent mass diffusivity. Absorption rates were found to be strongly dependent on, and inversely proportional to, the system temperature. The absolute average errors of the absolute pressure prediction were lower than 4%. When the nonideal effects are ignored, the absolute average errors can be as large as 30%. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25476435 [article] Experimental and theoretical analysis of CO2 absorption in polyolester oil using the PC - SAFT equation of state to account for nonideal effects [texte imprimé] / Moisés A. Marcelino Neto, Auteur ; Jader R. Barbosa, Auteur . - 2012 . - pp. 1027-1035. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 2 (Janvier 2012) . - pp. 1027-1035 Mots-clés : Thermodynamic  properties  Equations  of  state  Gas  absorption  Carbon  dioxide Résumé : The purpose of this work is to study the absorption of carbon dioxide (CO2) through the free surface of a stagnant layer of polyolester oil in a closed cell via the pressure decay method. The system pressure and local temperatures in the vapor and liquid phases were recorded as a function of time for system temperatures of 25, 40, 55, and 70 °C. The tests were carried out for two initial heights of the liquid layer of 37 and 74 mm, respectively. The mass of CO2 that entered the cell was measured for each test. The data were used to validate a transient mass diffusion model that accounts for the departure from the ideal behavior. The model uses the PC-SAFT equation of state and incorporates the following nonideal effects: (i) gas compressibility in the vapor, (ii) liquid phase swelling, (iii) concentration-dependent nonideal density behavior, (iv) nonideal phase equilibrium at the vapor―liquid interface, and (v) concentration-dependent mass diffusivity. Absorption rates were found to be strongly dependent on, and inversely proportional to, the system temperature. The absolute average errors of the absolute pressure prediction were lower than 4%. When the nonideal effects are ignored, the absolute average errors can be as large as 30%. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25476435