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Measurements of saturated densities and critical parameters for the binary mixture of 2,3,3,3-tetrafluoropropene (R-1234yf) + difluoromethane (R-32) / Ryo Akasaka in International journal of refrigeration, Vol. 36 N° 4 (Juin 2013) 

Public ISBD [article]  in International journal of refrigeration > Vol. 36 N° 4 (Juin 2013) . - pp. 1341–1346 Titre : Measurements of saturated densities and critical parameters for the binary mixture of 2,3,3,3-tetrafluoropropene (R-1234yf) + difluoromethane (R-32) Titre original : Mesures des masses volumiques saturées et paramètres critiques d'un mélange binaire de 2,3,3,3-tétrafluoropropène (R-1234yf) + difluorométhane (R-32) Type de document : texte imprimé Auteurs : Ryo Akasaka, Auteur ; Katsuyuki Tanaka, Auteur ; Yukihiro Higashi, Auteur Année de publication : 2013 Article en page(s) : pp. 1341–1346 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Critical  density;  Critical  point;  Critical  pressure;  Critical  temperature;  R-1234yf  +  R-32  mixture Résumé : The vapor–liquid coexistence curves near the critical point of the binary mixture of 2,3,3,3-tetrafluoropropene (R-1234yf) + difluoromethane (R-32) were measured by means of the visual observation of meniscus disappearance. Eleven, eighteen, and eleven saturated densities were obtained for mixtures with 50.00 mass%, 80.01 mass%, and 90.00 mass% of R-1234yf, respectively. The critical temperatures, critical densities, and critical molar volumes of the mixtures were determined from the meniscus disappearing level and the intensity of the critical opalescence. The critical pressures of the mixtures were also determined from the analysis of pρTx measurements. The composition dependence of the critical parameters was formulated with simple correlations. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713000285 [article] Measurements of saturated densities and critical parameters for the binary mixture of 2,3,3,3-tetrafluoropropene (R-1234yf) + difluoromethane (R-32) = Mesures des masses volumiques saturées et paramètres critiques d'un mélange binaire de 2,3,3,3-tétrafluoropropène (R-1234yf) + difluorométhane (R-32) [texte imprimé] / Ryo Akasaka, Auteur ; Katsuyuki Tanaka, Auteur ; Yukihiro Higashi, Auteur . - 2013 . - pp. 1341–1346. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 4 (Juin 2013) . - pp. 1341–1346 Mots-clés : Critical  density;  Critical  point;  Critical  pressure;  Critical  temperature;  R-1234yf  +  R-32  mixture Résumé : The vapor–liquid coexistence curves near the critical point of the binary mixture of 2,3,3,3-tetrafluoropropene (R-1234yf) + difluoromethane (R-32) were measured by means of the visual observation of meniscus disappearance. Eleven, eighteen, and eleven saturated densities were obtained for mixtures with 50.00 mass%, 80.01 mass%, and 90.00 mass% of R-1234yf, respectively. The critical temperatures, critical densities, and critical molar volumes of the mixtures were determined from the meniscus disappearing level and the intensity of the critical opalescence. The critical pressures of the mixtures were also determined from the analysis of pρTx measurements. The composition dependence of the critical parameters was formulated with simple correlations. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713000285

Thermodynamic properties of HFO-1234yf (2,3,3,3-tetrafluoropropene) / Katsuyuki Tanaka in International journal of refrigeration, Vol. 33 N° 3 (Mai 2010) 

Public ISBD [article]  in International journal of refrigeration > Vol. 33 N° 3 (Mai 2010) . - pp. 474-479 Titre : Thermodynamic properties of HFO-1234yf (2,3,3,3-tetrafluoropropene) Titre original : Propriétés thermodynamiques du HFO-1234yf (2,3,3,3-tétrafluoropropène) Type de document : texte imprimé Auteurs : Katsuyuki Tanaka, Auteur ; Yukihiro Higashi, Auteur Année de publication : 2010 Article en page(s) : pp. 474-479 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Refrigerant  R-1234yf  Measurement  Thermodynamic  measurement  Equation  of  state  Surface  tension Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Measurements of the thermodynamic properties of HFO-1234yf were conducted. The critical temperature TC, critical density ρC, and critical pressure PC, were measured by the visual observation of the meniscus disappearance, and were determined to be 367.85 ± 0.01 K, 478 ± 3 kg/m3, and 3382 ± 3 kPa, respectively. Vapor pressures were measured by a batch-type calorimeter with a metal-bellows in the temperature range from 310 K to 360 K and correlated by the Wagner-type equation. Surface tensions were measured by the differential capillary-rise method in the temperature range from 273 K to 340 K and correlated by the van der-Waals type equation. The acentric factor was determined to be 0.280 with the vapor pressure correlation. Based on the critical parameters and acentric factor, saturated vapor and liquid densities were estimated by the Peng–Robinson equation and the Hankinson–Thomson equation, respectively. The heat of vaporization was also calculated from the Clausius–Clapeyron equation. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700709002345 [article] Thermodynamic properties of HFO-1234yf (2,3,3,3-tetrafluoropropene) = Propriétés thermodynamiques du HFO-1234yf (2,3,3,3-tétrafluoropropène) [texte imprimé] / Katsuyuki Tanaka, Auteur ; Yukihiro Higashi, Auteur . - 2010 . - pp. 474-479. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 33 N° 3 (Mai 2010) . - pp. 474-479 Mots-clés : Refrigerant  R-1234yf  Measurement  Thermodynamic  measurement  Equation  of  state  Surface  tension Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Measurements of the thermodynamic properties of HFO-1234yf were conducted. The critical temperature TC, critical density ρC, and critical pressure PC, were measured by the visual observation of the meniscus disappearance, and were determined to be 367.85 ± 0.01 K, 478 ± 3 kg/m3, and 3382 ± 3 kPa, respectively. Vapor pressures were measured by a batch-type calorimeter with a metal-bellows in the temperature range from 310 K to 360 K and correlated by the Wagner-type equation. Surface tensions were measured by the differential capillary-rise method in the temperature range from 273 K to 340 K and correlated by the van der-Waals type equation. The acentric factor was determined to be 0.280 with the vapor pressure correlation. Based on the critical parameters and acentric factor, saturated vapor and liquid densities were estimated by the Peng–Robinson equation and the Hankinson–Thomson equation, respectively. The heat of vaporization was also calculated from the Clausius–Clapeyron equation. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700709002345