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Behavior of isobaric heat capacity of R32 in the gas phase / Noboru Kagawa in International journal of refrigeration, Vol. 36 N° 8 (Décembre 2013) 

Public ISBD [article]  in International journal of refrigeration > Vol. 36 N° 8 (Décembre 2013) . - pp. 2216-2222 Titre : Behavior of isobaric heat capacity of R32 in the gas phase Titre original : Comportement de la capacité thermique isobare de R32 dans la phase gazeuse Type de document : texte imprimé Auteurs : Noboru Kagawa, Auteur ; Atsushi Matsuguchi, Auteur ; Kenichi Yamaya, Auteur Année de publication : 2014 Article en page(s) : pp. 2216-2222 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Heat  capacity;  R32;  gas;  ideal  gas;  saturation;  calorimetry Résumé : The specific isobaric heat capacity was measured for R 32 (difluoromethane) in the gas phase. Twenty-one measurements for R 32 were obtained at temperatures from 282 to 319 K and at pressures from 1.0 to 2.4 MPa, which are very close to the saturation curve. The expanded uncertainty (k = 2) of the temperature measurements is estimated to be less than 23 mK, and that of the pressure measurements is less than 15 kPa. The expanded uncertainty for cp is estimated to range from 15 to 47 J kg−1 K−1. The measurements were compared with available equations of state. Based on the measurements, heat capacity curves of the ideal gas and saturated vapor of R 32 were specified. These data will be very useful for improving available models, especially for correcting behavior in the gas phase, so as to represent reliable thermodynamic properties of R 32 and refrigerant mixtures with R32 that are used for refrigeration and air conditioning systems. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713001825 [article] Behavior of isobaric heat capacity of R32 in the gas phase = Comportement de la capacité thermique isobare de R32 dans la phase gazeuse [texte imprimé] / Noboru Kagawa, Auteur ; Atsushi Matsuguchi, Auteur ; Kenichi Yamaya, Auteur . - 2014 . - pp. 2216-2222. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 8 (Décembre 2013) . - pp. 2216-2222 Mots-clés : Heat  capacity;  R32;  gas;  ideal  gas;  saturation;  calorimetry Résumé : The specific isobaric heat capacity was measured for R 32 (difluoromethane) in the gas phase. Twenty-one measurements for R 32 were obtained at temperatures from 282 to 319 K and at pressures from 1.0 to 2.4 MPa, which are very close to the saturation curve. The expanded uncertainty (k = 2) of the temperature measurements is estimated to be less than 23 mK, and that of the pressure measurements is less than 15 kPa. The expanded uncertainty for cp is estimated to range from 15 to 47 J kg−1 K−1. The measurements were compared with available equations of state. Based on the measurements, heat capacity curves of the ideal gas and saturated vapor of R 32 were specified. These data will be very useful for improving available models, especially for correcting behavior in the gas phase, so as to represent reliable thermodynamic properties of R 32 and refrigerant mixtures with R32 that are used for refrigeration and air conditioning systems. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713001825